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BEGIN:VEVENT
SUMMARY:Fermions with long-range interactions using a matrix-product-state
s approach
DTSTART;VALUE=DATE-TIME:20160726T190000Z
DTEND;VALUE=DATE-TIME:20160726T200000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2726@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Marcin Szyniszewski (Lancaster University)\nThe long
-range t-V model of fermions on a lattice is known to exhibit a transition
between a Luttinger liquid phase and a Mott insulator phase [1]. At insul
ating densities\, one can tailor the potential energy of the model in such
a way that one forces a quantum phase transition to either another insula
ting charge-density-wave phase\, a bond-order phase or a Luttinger liquid
[2]. We show how to construct a matrix product operator representation of
the Hamiltonian of the t-V model and we present phase diagrams calculated
using the matrix-product-states approach [3]. We compare these phase diagr
ams with results obtained in the atomic limit.\n\nReferences\n----------\n
\n 1. G. Gómez-Santos\, Phys. Rev. Lett. 70\, 3780 (1993).\n 2. P. Schmit
teckert and R. Werner\, Phys. Rev. B 69\, 195115 (2004)\; T. Mishra et al.
\, Phys. Rev. B 84\, 115135 (2011).\n 3. D. Perez-Garcia et al.\, Quantum
Inf. Comput. 7\, 401 (2007)\; F. Verstraete et al.\, Adv. Phys. 57\, 143 (
2008).\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2726/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2726/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Locating the critical end point of QCD
DTSTART;VALUE=DATE-TIME:20160725T172500Z
DTEND;VALUE=DATE-TIME:20160725T174500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2725@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Christian Fischer (JLU Giessen)\nI will give an over
view on our recent results for the phase\ndiagram of QCD with Nf=2+1 and N
f=2+1+1 flavors. We use a combination\nof lattice and Dyson-Schwinger meth
ods to determine the chiral\nand deconfinement order parameters at finite
temperature and chemical \npotential. In a recent exploratory study we als
o give a first estimate \non the influence of baryon effects on the locati
on of the critical \nend-point. As a result we find a critical end-point a
t large chemical \npotential in the vicinity of the chiral critical line e
xtrapolated from\nlattice QCD.\n\nhttps://conference.ippp.dur.ac.uk/event/
470/contributions/2725/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2725/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lefschetz-thimble approach to the Silver Blaze problem of one-site
fermion model
DTSTART;VALUE=DATE-TIME:20160727T082000Z
DTEND;VALUE=DATE-TIME:20160727T084000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2724@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Yuya Tanizaki (RIKEN BNL Research Center)\nPath inte
gral on Lefschetz thimbles gets much attention in the context of the sign
problem\, because of its usefulness in order to study the system with the
complex classical action nonperturbatively. After giving its brief introdu
ction\, it is applied for studying the sign problem of the one-site Hubbar
d model. This model has a severe sign problem\, which looks quite similar
to that of the finite-density QCD at low temperatures. We present the anal
ytical study of the sign problem using the Lefschetz-thimble method\, and
also discuss the failure of the complex Langevin method. Furthermore\, we
give a speculation about the early-onset problem of the baryon number dens
ity\, called the baryon Silver Blaze problem\, based on similarity between
the sign problems of one-site Hubbard model and of finite-density QCD.\n\
nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2724/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2724/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Proton spin decomposition and its perturbative renormalization
DTSTART;VALUE=DATE-TIME:20160725T133500Z
DTEND;VALUE=DATE-TIME:20160725T135500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2723@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: YIBO Yang (university of Kentucky)\nI shall report o
n the progress of the proton spin decomposition based on Ji’s scheme and
also the necessary perturbative calculation\, to convert them from the la
ttice regularization to MS-bar scheme at 2 GeV.\n\nhttps://conference.ippp
.dur.ac.uk/event/470/contributions/2723/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2723/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Beyond complex Langevin equations:positive representation of Feynm
an path integrals directly in the Minkowski time
DTSTART;VALUE=DATE-TIME:20160725T154500Z
DTEND;VALUE=DATE-TIME:20160725T160500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2722@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Jacek Wosiek (Jagellonian University)\nA positive re
presentation for an arbitrary complex\, gaussian weight is derived and use
d to construct a statistical formulation of gaussian path integrals direct
ly in the Minkowski time. \n\nThe positivity of Minkowski weights is achie
ved by doubling the number of real variables. The continuum limit of the n
ew representation exists only if some of the additional couplings tend to
infinity and are tuned in a specific way. The construction is then success
fully applied to three quantum mechanical examples including a particle in
a constant magnetic field -- a simplest prototype of a Wilson line. \n\nF
urther generalizations are shortly discussed and an intriguing interpretat
ion of new variables is alluded to.\n\nhttps://conference.ippp.dur.ac.uk/e
vent/470/contributions/2722/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2722/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A G(2)-QCD Neutron Star
DTSTART;VALUE=DATE-TIME:20160726T190000Z
DTEND;VALUE=DATE-TIME:20160726T200000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2721@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Ouraman Hajizadeh (University of Graz)\nG2-QCD\, i.e
. QCD with the gauge group SU(3) replaced by the exceptional\ngroup G(2)\,
shares many features with SU(3). But it is accessible at\nfinite density
on the lattice\, as it has no sign problem\, and at the\nsame time has a n
eutron.\n\nTherefore\, this theory can sustain in princple neutron star. U
sing the\nequation of state for this theory from lattice simulations\, we
solve the\nOppenheimer-Volkoff equation and obtain the mass-radius-relatio
n of such\nneutron stars.\n\nThis study shows how different phases\, visib
le in the equation of state\,\ninfluence the mass-radius relation\, and th
erefore gives guidance for the\ncase of full QCD and true neutron stars.\n
\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2721/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2721/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A performance evaluation of CCS QCD Benchmark on Intel Xeon Phi (K
NC) systems
DTSTART;VALUE=DATE-TIME:20160728T142000Z
DTEND;VALUE=DATE-TIME:20160728T144000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2720@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Ken-Ichi Ishikawa (Hiroshima University)\nThe most c
omputationally demanding part of Lattice QCD simulations is\nsolving quark
propagators.\nQuark propagators are typically obtained with a linear equa
tion solver utilizing HPC machines.\nThe success of Lattice QCD simulation
s owes much to the development of numerical algorithms and\noptimization f
or the quark solver\, and evolution of HPC machines.\nThe CCS QCD Benchmar
k is a benchmark program solving the Wilson-Clover quark propagator\, and
is\ndeveloped at Center of Computational Sciences (CCS)\, University of Ts
ukuba.\nThis is designed to be as simple as possible and is written in pla
in Fortran 90 so that\nnew algorithms or new HPC architectures can be eval
uated quickly with this benchmark program.\nWe optimized the benchmark pro
gram for a Intel Xeon Phi (Knights Corner\, KNC) system\nnamed "COMA (PACS
-IX)" at CCS Tsukuba under the Intel Parallel Computing Center program.\nA
single precision BiCGStab solver with the overlapped Restricted Additive
Schwarz (RAS)\npreconditioner was implemented using SIMD intrinsics\, Open
MP and MPI in the offload-mode.\nIn this talk\, we will show the optimizat
ion methods and the performance of the CCS QCD\nbenchmark on the COMA syst
em.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2720/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2720/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice operators for scattering of particles with spin
DTSTART;VALUE=DATE-TIME:20160726T163000Z
DTEND;VALUE=DATE-TIME:20160726T165000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2719@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Sasa Prelovsek (University of Ljubljana)\nThe operat
ors for simulating the scattering of two hadrons with spin will be present
ed. Three methods give consistent operators for PN\, PV\, VN and NN scatte
ring\, where P\, V and N denote pseudoscalar\, vector and nucleon. Explici
t expressions for all irreducible representations and few lowest momenta w
ill be shown as an example. Correct transformation properties will be demo
nstrated.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/271
9/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2719/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Diagrammatic Monte-Carlo simulations of the large N SU(N)xSU(N) pr
incipal chiral model based on the weak-coupling trans-series expansion
DTSTART;VALUE=DATE-TIME:20160725T164500Z
DTEND;VALUE=DATE-TIME:20160725T170500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2718@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Pavel Buividovich (Regensburg University)\nI present
a Diagrammatic Monte-Carlo algorithm for the large N SU(N)xSU(N) principa
l chiral model\, which stochastically samples planar Feynman diagrams of t
he lattice perturbation theory. The latter is constructed using the Cayley
map from SU(N) group manifold to the space of Hermitian matrices. I demon
strate that the Jacobian of this map results in the massive bare lattice p
ropagator with the mass proportional to the bare coupling. This bare mass
term ensures that perturbative series are IR finite and do not have factor
ial divergences at high orders\, which makes the series suitable for Monte
-Carlo sampling and stochastic summation. On the other hand\, since the ba
re mass is proportional to the coupling itself\, the expansion is no longe
r an expansion in powers of coupling\, but rather has the form of trans-se
ries involving both powers and logs of coupling. I discuss possible resurg
ent structure of these trans-series\, the strength of the sign problem in
Monte-Carlo sampling\, as well as the extension of the present approach to
lattice gauge theory.\n\nhttps://conference.ippp.dur.ac.uk/event/470/cont
ributions/2718/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2718/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Review on Hadron Spectroscopy
DTSTART;VALUE=DATE-TIME:20160725T084500Z
DTEND;VALUE=DATE-TIME:20160725T093000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2717@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Chuan Liu (Peking University)\nI review the recent l
attice results on spectroscopy and resonances in the past years.\nFor the
conventional hadron spectrum computations\,\nfocus has been put on the iso
spin breaking effects\, QED effects\, and simulations near the\nphysical p
oint. I then go through several single-channel scattering studies\nusing L
uescher formalism which has matured over the past years.\nThe topics cover
light hadrons and also the charmed mesons\, with the latter\ncase intimat
ely related to the recently discovered exotic XYZ particles.\nOther possib
le related formalisms that are available on the market are also discussed.
\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2717/
LOCATION:Highfield Campus\, University of Southampton Building 32 (EEE) Ro
om 1015 and Building 67 (Nightingale) Room 1027 via video link
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2717/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Step scaling in X-space: running of the quark mass
DTSTART;VALUE=DATE-TIME:20160726T132000Z
DTEND;VALUE=DATE-TIME:20160726T134000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2716@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Krzysztof Cichy (Goethe-University Frankfurt am Main
)\nWe perform a benchmark study of the step scaling procedure for the rati
os of renormalization constants extracted from position space correlation
functions. We work in the quenched approximation and consider the pseudosc
alar\, scalar\, vector and axial vector bilinears. The pseudoscalar/scalar
cases allow us to obtain the non-perturbative running of the quark mass o
ver a wide range of energy scales - from around 15 GeV to nearly 1 GeV - w
hich agrees well with the 4-loop prediction of continuum perturbation theo
ry. We find that step scaling is feasible in X-space and we discuss its a
dvantages and potential problems.\n\nhttps://conference.ippp.dur.ac.uk/eve
nt/470/contributions/2716/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2716/
END:VEVENT
BEGIN:VEVENT
SUMMARY:B_c decays from highly improved staggered quarks and NRQCD
DTSTART;VALUE=DATE-TIME:20160727T084000Z
DTEND;VALUE=DATE-TIME:20160727T090000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2715@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Andrew Lytle (University of Glasgow)\nWe use both no
n-relativistic QCD (NRQCD) and fully relativistic formalisms to calculate\
nsemileptonic form factors for the decays B_c -> eta_c lv and B_c -> J/psi
lv over the entire q^2 range. To achieve this we employ a highly improve
d lattice quark action at several lattice spacings down to a=.044 fm\, whi
ch allows a fully relativistic treatment of charm and simulation of the fu
ll q^2 range with controlled continuum extrapolation. We have two ways of
treating the b quark: either with an O(alpha_s) improved NRQCD formalism
or by extrapolating a heavy mass m_h to m_b in the relativistic formalism.
Comparison of the two approaches provides an important cross-check of met
hodologies in lattice QCD. Nonperturbative renormalisation of the currents
in the relativistic theory also allows us then to fix NRQCD-charm normali
sation for b to c decays such as B -> D and B -> D^*.\n\nhttps://conferenc
e.ippp.dur.ac.uk/event/470/contributions/2715/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2715/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Perturbative calculation of $Z_q$ and $Z_m$ at the one-loop level
using improved staggered quarks
DTSTART;VALUE=DATE-TIME:20160726T180000Z
DTEND;VALUE=DATE-TIME:20160726T190000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2714@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Benjamin Jaedon Choi (Seoul National University / La
ttice Gauge Theory Research Center)\nWe present results of matching factor
s for $Z_q$ and $Z_m$ calculated perturbatively at the one loop level with
improved staggered quarks. We calculate $Z_q$ and $Z_m$ with HYP-smeared
staggered quarks. Final results of $Z_q$ and $Z_m$ at $\\mu = 2 \\ \\tex
t{GeV}$ and $3 \\ \\text{GeV}$ in the $\\overline{\\text{MS}}$ scheme are
given in tables.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contribut
ions/2714/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2714/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Polarizability of pseudoscalar mesons from the lattice calculation
s
DTSTART;VALUE=DATE-TIME:20160729T155000Z
DTEND;VALUE=DATE-TIME:20160729T161000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2713@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Elena Luschevskaya (State Scientific Center of Russi
an Federation - Institute of Theoretical and Experimental Physics)\nWe exp
lore the ground state energy of pseudoscalar charged and neutral mesons a
s a function of external magnetic field in SU(3) lattice gauge theory. We
calculate the dipole magnetic polarizabilities and hyperpolarizabilities o
f charged and neutral pseudoscalar pi and K mesons. It was found that the
magnetic polarizability of charged pion agrees with the experimental predi
ction of COMPASS collaboration.\n\nhttps://conference.ippp.dur.ac.uk/event
/470/contributions/2713/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2713/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Study of the phase diagram of dense QC$_2$D with $N_f=2$ within la
ttice simulation
DTSTART;VALUE=DATE-TIME:20160728T161000Z
DTEND;VALUE=DATE-TIME:20160728T163000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2712@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Aleksandr Nikolaev (ITEP)\nIn this talk we present o
ur results on the low-temperature scan of the phase diagram of dense two-c
olor QCD with $N_f=2$ quarks. The study is conducted using lattice simulat
ion with rooted staggered quarks. At small chemical potential we observe t
he hadronic phase\, where the theory is in a confining state\, chiral symm
etry is broken\, the baryon density is zero and there is no diquark conden
sate. At the critical point $\\mu = m_{\\pi}/2$ we observe the expected se
cond order transition to Bose-Einstein condensation of scalar diquarks. In
this phase the system is still in confinement in conjunction with non-zer
o baryon density\, but the chiral symmetry is restored in the chiral limit
. We have also found that in the first two phases the system is well descr
ibed by chiral perturbation theory. For larger values of the chemical pote
ntial the system turns into another phase\, where the relevant degrees of
freedom are fermions residing inside the Fermi sphere\, and the diquark co
ndensation takes place on the Fermi surface. In this phase the system is s
till in confinement\, chiral symmetry is restored and the system is very s
imilar to the quarkyonic state predicted by SU($N_c$) theory at large $N_c
$.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2712/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2712/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QCD with Flavored Minimally Doubled Fermions
DTSTART;VALUE=DATE-TIME:20160725T133500Z
DTEND;VALUE=DATE-TIME:20160725T135500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2711@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Johannes Heinrich Weber (Technische Universität Mü
nchen)\nI discuss QCD with Flavored Minimally Doubled Fermions as sea quar
ks.\nMinimally Doubled Fermions are an ultra-local formulation that realiz
es a non-singlet chiral symmetry with only two real fermions at finite lat
tice cutoff\, but break the hypercubic symmetry as well as some discrete s
pace-time symmetries.\nI show that the broken discrete space-time symmetri
es do not affect vacuum since the corresponding symmetry breaking terms ca
ncel exactly in the fermion determinant.\nWith a non-singlet mass term\, I
introduce a well-controlled definition of flavor in the continuum limit w
hich is consistent with the naturally emergent flavor structure of meson c
orrelation functions at finite cutoff.\n\nhttps://conference.ippp.dur.ac.u
k/event/470/contributions/2711/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2711/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Roberge-Weiss transition in Nf=2 QCD with staggered fermions and N
t=6
DTSTART;VALUE=DATE-TIME:20160725T160500Z
DTEND;VALUE=DATE-TIME:20160725T162500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2710@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Alessandro Sciarra (Goethe Universität)\nThe QCD ph
ase diagram at imaginary chemical potential exhibits a rich structure and
studying it\ncan constrain the phase diagram at real values of the chemica
l potential. Moreover\, at imaginary\nchemical potential standard numeric
techniques based on importance sampling can be applied\, since \nno sign p
roblem is present.\n\nIn the last decade\, a first understanding of the QC
D phase diagram at imaginary chemical potential\nhas been developed\, but
it is so far based on investigations on coarse lattices ($N_t=4\,\\\;a=0.3
$ fm).\nConsidering the $N_f=2$ case\, at the Roberge-Weiss critical value
of the imaginary chemical potential\,\nthe chiral/deconfinement transitio
n is first order for light/heavy quark masses\nand second order for interm
ediate values of the mass: there are then two tricritical masses\, whose\n
position strongly depends on the lattice spacing and on the discretisation
. On $N_t=4$\, we have the chiral \n$m_{\\pi}^{\\mbox{tric.}}\\simeq400$ M
eV with unimproved staggered fermions and $m_{\\pi}^{\\mbox{tric.}}\\simeq
900$ MeV with unimproved pure Wilson fermions.\n\nEmploying finite size sc
aling we investigate the change of this tricritical point between $N_t=4$
and $N_t=6$\nas well as between Wilson and staggered discretisations.\n\nh
ttps://conference.ippp.dur.ac.uk/event/470/contributions/2710/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2710/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Double Parton Distributions of the Pion
DTSTART;VALUE=DATE-TIME:20160729T163000Z
DTEND;VALUE=DATE-TIME:20160729T165000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2709@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Christian Zimmermann (University of Regensburg)\nThe
effects of double hard interactions are no longer negligible at energy sc
ales reached at the LHC. Double parton scattering (DPS) processes are ofte
n described by taking the product of two single parton scattering processe
s assuming that interference effects are very small. We calculate four poi
nt functions (4pt-functions)\, which appear in the the DPS cross section\,
employing lattice techniques. We consider a pion at rest and test the val
idity of the afore-mentioned factorization assumption by convoluting two p
ion form factors and comparing the result to the 4pt data. For our calcula
tions we use a $N_f = 2$ gauge ensemble on a $40^3 \\times 64$ lattice\, w
ith lattice spacing $a = 0.071 \\mathrm{fm}$ and pion mass $m_{\\pi} = 288
.8 \\mathrm{MeV}$.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contribu
tions/2709/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2709/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Scalar QCD at nonzero density
DTSTART;VALUE=DATE-TIME:20160729T142000Z
DTEND;VALUE=DATE-TIME:20160729T144000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2708@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Jacob Wellnhofer (Universität Regensburg)\nWe study
scalar QCD at nonzero density in the strong coupling limit. \nIt has a si
gn problem which looks structurally similar to the one in QCD.\nAfter intr
oducing dual variables by integrating out the SU(3) gauge links\nwe find t
hat we need at least 3 flavors for a nontrivial dependence on the \nchemic
al potential. \nIn this dual representation there is no sign problem remai
ning. \nThe dual variables are partially constrained\, \nthus we use a hyb
rid approach for the updates: \nFor unconstrained variables we use local u
pdates\, \nwhile for constrained variables we use updates based on the wor
m algorithm.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/
2708/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2708/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chiral phase transition in (2 + 1)-flavor QCD on $N_{\\tau} = 6$ l
attices
DTSTART;VALUE=DATE-TIME:20160726T180000Z
DTEND;VALUE=DATE-TIME:20160726T190000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2707@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Sheng-Tai Li (Central China Normal University)\nWe p
resent updated studies of chiral phase transition in $N_{f}=2+1$ QCD. Simu
lations have been performed with Highly Improved Staggered Quarks (HISQ) o
n lattices with temporal extent $N_{\\tau} = 6$ at vanishing baryon chemic
al potential. We updated our previous study (1511.00553) by extending the
temperature window from (140MeV\, 150MeV) to (140MeV\, 170MeV). The strang
e quark mass was chosen to its physical value $m_{s}^{phy}$\, and five val
ues of two degenerate light quark masses $(m_{l})$ are varied from $m_{s}^
{phy}/80$ to $m_{s}^{phy}/20$ which correspond to a Goldstone pion mass ra
nging from 80 MeV to 160 MeV in the continuum limit.\n\nThe universal scal
ing behaviour of the QCD chiral phase transition is investigated by studyi
ng the temperature and quark mass dependence of chiral condensates and chi
ral susceptibilities. The window of criticality compared to previous studi
es is also discussed.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contr
ibutions/2707/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2707/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Determination of charm quark mass from temporal moments of charmon
ium correlator with Mobius domain-wall fermion
DTSTART;VALUE=DATE-TIME:20160726T140000Z
DTEND;VALUE=DATE-TIME:20160726T142000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2706@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Katsumasa Nakayama (Nagoya University)\nWe extract t
he charm quark mass and the strong coupling\nconstant\nby using the charmo
nium current correlators with $n_f$ = 2 + 1 Mobius\ndomain\nwall fermions.
The temporal moments of the correlators are sensitive to\nshort-distance
physics\, and could be also calculated in the\ncontinuum theory by perturb
ative expansion\, which is known up to four-\nloop order.We match our latt
ice calculation with perturbative result\, and extract the charm quark mas
s with the uncertainty less than 1%. \nWe also confirm the correlators in
the vector channel to be consistent with experimental data for R-ratio.\nW
e used the ensembles by the JLQCD collaboration at lattice spacings a = 0.
083 fm\, 0.055 fm and 0.044 fm\, are extrapolated to the continuum limit.\
n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2706/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2706/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Domain decomposition and multilevel integration for fermions I
DTSTART;VALUE=DATE-TIME:20160727T080000Z
DTEND;VALUE=DATE-TIME:20160727T082000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2705@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Stefan Schaefer (NIC\, DESY)\nThe numerical computat
ion of many hadronic correlation functions is exceedingly difficult due to
the exponentially decreasing signal-to-noise ratio with the distance betw
een source and sink. Multilevel integration methods\, using independent up
dates of separate regions in space-time\, are known to be able to solve su
ch problems but have so far been available only for pure gauge theory.\n\n
We present first steps into the direction of making such integration schem
es amenable to theories with fermions\, by factorizing a given observable
via an approximated domain decomposition of the quark propagator. This all
ows for multilevel integration of the (large) factorized contribution to t
he observable\, while its (small) correction can be computed in the standa
rd way.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2705/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2705/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gradient flow running coupling in SU(2) with 6 flavors
DTSTART;VALUE=DATE-TIME:20160728T155000Z
DTEND;VALUE=DATE-TIME:20160728T161000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2704@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Viljami Leino (University of Helsinki)\nWe present p
reliminary results of the gradient flow running coupling in SU(2) gauge th
eory with 6 massless fundamental representation fermion flavours. We use t
he Schrödinger functional boundary conditions\, which allows us to also m
easure the mass anomalous dimension. Our results\, using the HEX-smeared W
ilson-clover action\, are consistent with perturbative running on the weak
coupling region and diverge towards a possible infrared fixed point at st
rong coupling.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contribution
s/2704/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2704/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Domain decomposition and multilevel integration for fermions II
DTSTART;VALUE=DATE-TIME:20160727T082000Z
DTEND;VALUE=DATE-TIME:20160727T084000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2703@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Marco Cè (Scuola Normale Superiore\, Pisa\, Italy &
amp\; INFN\, Sezione di Pisa\, Italy)\nThe numerical computation of many h
adronic correlation functions is exceedingly\ndifficult due to the exponen
tially decreasing signal-to-noise ratio with the\ndistance between source
and sink. Multilevel integration methods\, using independent\nupdates of s
eparate regions in space-time\, are known to be able to solve such\nproble
ms but have so far been available only for pure gauge theory.\n\nWe presen
t first steps into the direction of making such integration schemes amenab
le\nto theories with fermions\, by factorizing a given observable via an a
pproximated domain\ndecomposition of the quark propagator. This allows for
multilevel integration of the\n(large) factorized contribution to the obs
ervable\, while its (small) correction can be\ncomputed in the standard wa
y.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2703/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2703/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Testing dynamic stabilization in complex Langevin simulations
DTSTART;VALUE=DATE-TIME:20160726T132000Z
DTEND;VALUE=DATE-TIME:20160726T134000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2702@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Benjamin Jaeger (Swansea University)\nComplex Langev
in methods have been successfully applied in theories that suffer from a s
ign problem such as HDQCD. We present and illustrate a novel method that e
nsures that Complex Langevin simulations stay close to the SU(3) manifold\
, which lead to correct and improved results in the framework of HDQCD and
pure gauge simulations. Applying the same technique in fully dynamical QC
D simulations shows great potential to allow the determination of the phas
e diagram from first principles.\n\nhttps://conference.ippp.dur.ac.uk/even
t/470/contributions/2702/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2702/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Charmed-bottom mesons from Lattice QCD
DTSTART;VALUE=DATE-TIME:20160729T144000Z
DTEND;VALUE=DATE-TIME:20160729T150000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2701@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Nilmani Mathur (Tata Institute of Fundamental Resear
ch)\nWe present ground state spectra of mesons containing a charm and a\nb
ottom quark. For the charm quark we use overlap valence quarks while a\nno
n-relativistic formulation is utilized for the bottom quark on a\nbackgrou
nd of 2+1+1 flavor HISQ gauge configurations generated by the\nMILC collab
oration. We also study the ratio of leptonic decay\nconstants\, $f_{B_c^*}
/f_{B_c}$. Results are obtained at three lattice spacings.\n\nhttps://conf
erence.ippp.dur.ac.uk/event/470/contributions/2701/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2701/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Light-cone distribution amplitudes of the rho meson
DTSTART;VALUE=DATE-TIME:20160729T142000Z
DTEND;VALUE=DATE-TIME:20160729T144000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2700@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Meinulf Goeckeler (University of Regensburg)\nWe pre
sent preliminary results of the RQCD collaboration\nfor the lowest moments
of the distribution amplitudes of the\nrho meson obtained from simulation
s with 2 degenerate flavours\nof clover fermions. The quark masses are cho
sen such that we\nhave rho masses below the decay threshold as well as abo
ve\nthreshold. Treating the rho as a stable particle\, we find\nresults fo
r small quark masses which seem to follow the chiral\nextrapolation of res
ults obtained above the decay threshold\nregion.\n\nhttps://conference.ipp
p.dur.ac.uk/event/470/contributions/2700/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2700/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Complex spectrum of spin models for finite-density QCD
DTSTART;VALUE=DATE-TIME:20160727T092000Z
DTEND;VALUE=DATE-TIME:20160727T094000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2699@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Hiromichi Nishimura (RIKEN BNL Research Center)\nWe
consider the spectrum of transfer matrix eigenvalues associated with Polya
kov loops in lattice QCD at strong coupling. The transfer matrix at finite
density is non-Hermitian\, and its eigenvalues become complex as a manife
station of the sign problem. We show that the symmetry under charge and co
mplex conjugations ensures that the eigenvalues are either real or part of
a complex conjugate pair\, and the complex pairs lead to damped oscillato
ry behavior in Polyakov loop correlation functions\, which also appeared i
n our previous phenomenological models using complex saddle points. We arg
ue that the results reflect oscillatory behavior in color-charge densities
and it should be observable in lattice simulations of QCD at finite densi
ty.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2699/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2699/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Infrared features of dynamical QED+QCD simulations
DTSTART;VALUE=DATE-TIME:20160727T084000Z
DTEND;VALUE=DATE-TIME:20160727T090000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2698@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Ross Young (University of Adelaide)\nUsing dynamical
lattice simulations of the coupled theory of QED and QCD we explore some
particular aspects of the periodic boundary conditions. We observe that th
e finite volume effects in spectroscopy are dependent upon the precise imp
lementation of the gauge-fixing condition. We also report on the finite-vo
lume dependence of the charge renormalisation.\n\nhttps://conference.ippp.
dur.ac.uk/event/470/contributions/2698/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2698/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Approaching the bottom using fine lattices with Domain-wall fermio
ns.
DTSTART;VALUE=DATE-TIME:20160729T142000Z
DTEND;VALUE=DATE-TIME:20160729T144000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2697@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Brendan Fahy (KEK)\nWe explore the properties of hea
vy-light psuedoscalar mesons above the\ncharm mass sing Mobius domain-wall
fermions on fine lattices at a~0.080\,\n0.055\, and 0.044 fm. We examine
masses and decay constants using a\nseries of heavy quark masses up to 3 t
imes the charm quark. We attempt\nto analyze the cutoff effects for heavy
quarks above the charm and\naccount for the low order effects using ideas
from HQET. Using these\nresults we extrapolate to B-physics and report pre
liminary results for\nM_B(s) and F_B(s).\n\nhttps://conference.ippp.dur.ac
.uk/event/470/contributions/2697/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2697/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards extracting the timelike pion form factor on CLS 2-flavour
ensembles
DTSTART;VALUE=DATE-TIME:20160726T180000Z
DTEND;VALUE=DATE-TIME:20160726T190000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2696@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Felix Erben (University Mainz)\nResults are presente
d from an ongoing study of the $\\rho$ resonance. We use the LapH-smearing
approach in order to create correlator matrices involving $\\rho$ and $\\
pi\\pi$ interpolators. The study is done in a centre-of-mass frame and sev
eral moving frames. We are able to extract effective-energy levels by solv
ing the GEVP of those correlator matrices. The initial exploratory study i
s being done on a CLS 2-flavour lattice with a pion mass of $451$ $\\mathr
m{MeV}$ using $\\mathcal{O}(a)$ improved Wilson fermions. One aim of this
work is to extract the timelike pion form factor after applying the Lüsch
er formalism. We also have all the ingredients ready which allow us to int
egrate this study with the existing Mainz programme for the calculation of
the hadronic vacuum polarization contribution to the muon $g-2$. We plan
to extend our study to lower pion masses and larger lattices in the future
\, including ensembles with $2+1$ flavours.\n\nhttps://conference.ippp.dur
.ac.uk/event/470/contributions/2696/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2696/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Anderson localisation of Dirac eigenmodes in high temperature QCD
DTSTART;VALUE=DATE-TIME:20160729T142000Z
DTEND;VALUE=DATE-TIME:20160729T144000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2695@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Guido Cossu (Higgs Centre for Theoretical Physics\,
School of Physics and Astronomy\, University of Edinburgh)\nWe investigate
the properties of the background gauge field configurations that act as d
isorder for the Anderson localization mechanism in the Dirac spectrum of Q
CD at high temperatures. We compute the eigenmodes of the M\\"obius domain
-wall fermion operator on configurations generated for the $SU(3)$ gauge t
heory with two flavors of fermions\, in the temperature range $[0.9\,1.9]T
_c$. We identify the source of localization of the eigenmodes with gauge c
onfigurations that are self-dual and support negative fluctuations of the
Polyakov loop $P_L$\, in the high temperature sea of $P_L\\sim 1$. The dep
endence of these observations on the boundary conditions of the valence op
erator is studied. We also investigate the spatial overlap of the left-han
ded and right-handed projected eigenmodes in correlation with the localiza
tion and the corresponding eigenvalue. We discuss an interpretation of the
results in terms of monopole-instanton structures.\n\nhttps://conference.
ippp.dur.ac.uk/event/470/contributions/2695/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2695/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Status report on $\\varepsilon_K$ with lattice QCD inputs
DTSTART;VALUE=DATE-TIME:20160726T180000Z
DTEND;VALUE=DATE-TIME:20160726T190000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2694@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Weonjong Lee (Seoul National University)\nWe present
results of the indirect CP violation parameter in the\nneutral kaon syste
m\, $\\varepsilon_K$ calculated using lattice QCD\ninputs including $\\hat
{B}_K$\, $\\xi_0$\, $V_{us}$\, and $V_{cb}$.\n\nhttps://conference.ippp.du
r.ac.uk/event/470/contributions/2694/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2694/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gauge cooling for the singular-drift problem in the complex Lange
vin method - an application to finite density QCD
DTSTART;VALUE=DATE-TIME:20160726T165000Z
DTEND;VALUE=DATE-TIME:20160726T171000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2693@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Keitaro Nagata (KEK)\nThe complex Langevin method is
a promising approach \nto complex action systems\, which suffer from the
sign problem.\nIn particular\, the use of gauge cooling enabled the studie
s of finite \ndensity QCD either in the deconfined phase or in the heavy d
ense limit. \nIn the confined phase with light quarks\, however\, the meth
od does not\nwork as it is due to the singularities in the fermion drift t
erm\ncaused by small eigenvalues of the Dirac operator with the quark mass
.\nIn a previous paper\, we proposed that this singular-drift problem \nca
n be overcome by the gauge cooling with different criteria for choosing \n
the complexified gauge transformation\, and showed that\nthe method works
in chiral Random Matrix Theory even at small quark mass. \nHere\, we apply
the same idea to QCD at finite density with light quarks \nand present so
me preliminary results.\n\nhttps://conference.ippp.dur.ac.uk/event/470/con
tributions/2693/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2693/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Six-dimensional regularization of chiral gauge theories on a latti
ce I
DTSTART;VALUE=DATE-TIME:20160726T153000Z
DTEND;VALUE=DATE-TIME:20160726T155000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2692@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Hidenori Fukaya (Osaka University)\nWe propose a 6-d
imensional lattice regularization of chiral gauge theories.\nIn our formul
ation\, Weyl fermions are localized on the junction of two\ndifferent doma
in-walls. One domain-wall naturally exhibits the\nStora-Zumino chain of th
e anomaly descent equations. Another domain-wall mediates a similar inflow
of the global anomalies. The anomaly free condition is equivalent to requ
iring the measure of the 6-dimensional Dirac fermions to cancel the axial
U(1) and parity anomalies. ``Localizing'' the gauge fields on the 4-dimens
ional junction using\nthe Yang-Mills gradient flow\, as proposed by Grabow
ska and Kaplan\, we non-perturbatively define the 4-dimensional path integ
ral of the target chiral gauge theory.\n\nIn the first talk\, we present t
he basic idea of our formulation\,\nemphasizing on why the 6-th dimension
is needed for the global anomalies.\nIn the second talk\, we explain our l
attice set-up in details.\n\nhttps://conference.ippp.dur.ac.uk/event/470/c
ontributions/2692/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2692/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Six-dimensional regularization of chiral gauge theories on a latti
ce II
DTSTART;VALUE=DATE-TIME:20160726T155000Z
DTEND;VALUE=DATE-TIME:20160726T161000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2691@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Ryo Yamamura (Osaka U.)\nWe propose a 6-dimensional
lattice regularization of chiral gauge\ntheories. In our formulation\, Wey
l fermions are localized on the\njunction of two different domain-walls. O
ne domain-wall naturally\nexhibits the Stora-Zumino chain of the anomaly d
escent equations.\nAnother domain-wall mediates a similar inflow of the gl
obal anomalies.\nThe anomaly free condition is equivalent to requiring the
measure of\nthe 6-dimensional Dirac fermions to cancel the axial U(1) and
parity\nanomalies. ``Localizing'' the gauge fields on the 4-dimensional\n
junction using the Yang-Mills gradient flow\, as proposed by Grabowska\nan
d Kaplan\, we non-perturbatively define the 4-dimensional path\nintegral o
f the target chiral gauge theory.\n\nIn the first talk\, we present the ba
sic idea of our formulation\,\nemphasizing on why the 6-th dimension is ne
eded for the global\nanomalies. In the second talk\, we explain our lattic
e set-up in\ndetails.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contr
ibutions/2691/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2691/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Running coupling from Wilson flow for three quark flavors
DTSTART;VALUE=DATE-TIME:20160725T172500Z
DTEND;VALUE=DATE-TIME:20160725T174500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2690@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Gerrit Schierholz (DESY)\nThe running coupling const
ant $\\alpha_s(Q^2)$ is computed from the Wilson flow for three quark flav
ors on multiple volumes and a wide range of lattice spacings\, which allow
s for a continuum extrapolation. Of particular interest is the behavior at
small $Q^2$ and the question of an infrared fixed point.\n\nhttps://confe
rence.ippp.dur.ac.uk/event/470/contributions/2690/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2690/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The isospin-0 pion-pion scattering length from twisted mass lattic
e QCD
DTSTART;VALUE=DATE-TIME:20160726T161000Z
DTEND;VALUE=DATE-TIME:20160726T163000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2689@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Liuming Liu (University of Bonn)\nWe present results
for the $\\pi\\pi$ isospin-0 scattering length calculated in twisted mass
lattice\nQCD. We use a set of $N_f = 2 + 1 + 1$ ensembles with pion mass
\nvarying in the range of 230MeV - 510MeV at three different values of lat
tice spacing and two\n$N_f=2$ ensembles with one pion mass at its physical
value and one at 250MeV. \nThe quark disconnected diagrams are computed w
ith sufficient precision by using the stochastic\nLaplacian Heaviside quar
k smearing method. For the first time we extrapolate our lattice results t
o\nthe physical pion mass and continuum limit.\n\nhttps://conference.ippp.
dur.ac.uk/event/470/contributions/2689/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2689/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Importance of closed quark loops for lattice QCD studies of tetraq
uarks
DTSTART;VALUE=DATE-TIME:20160725T154500Z
DTEND;VALUE=DATE-TIME:20160725T160500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2688@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Joshua Berlin (University of Frankfurt)\nTo investig
ate the light scalar tetraquark candidate $a_0(980)$ (quantum numbers $J^P
=0^+$)\, a correlation matrix including a variety of two- and four-quark i
nterpolating operators has to be computed. We discuss efficient techniques
to compute the elements of this correlation matrix. In particular we pres
ent numerical results for diagrams with closed quark loops and present evi
dence that such diagrams are not negligible\, i.e. that their contribution
is essential to obtain physically meaningful results.\n\nhttps://conferen
ce.ippp.dur.ac.uk/event/470/contributions/2688/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2688/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Machines and Algorithms
DTSTART;VALUE=DATE-TIME:20160730T104500Z
DTEND;VALUE=DATE-TIME:20160730T113000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2687@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Peter Boyle (University of Edinburgh)\nI will discus
s the evolution of architectures for QCD with a focus\non the interplay be
tween architecture\, engineering\, data motion and algorithms. \nI also di
scuss recent progress in performance programming strategies and algorithms
.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2687/
LOCATION:University of Southampton\, Highfield Campus Building 32 (EEE) Ro
om 1015 and Building 67 (Nightingale) Room 1027 via video link
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2687/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hadronic contribution to the muon magnetic moment at the physical
point
DTSTART;VALUE=DATE-TIME:20160726T153000Z
DTEND;VALUE=DATE-TIME:20160726T155000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2686@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Taichi Kawanai (Forschungszentrum Jülich (Budapest-
Marseille-Wuppertal collaboration))\nRecent phenomenological and lattice d
eterminations of the anomalous magnetic moment of the muon $a_\\mu$ hint a
t beyond the Standard Model physics on the 3-4 sigma level. Here we prese
nt lattice results for the leading order hadronic contribution of $a_\\mu$
obtained from 2+1+1 flavor\, staggered quark simulations at the physical
point. The various quark flavor contributions\, together with their system
atics\, will be discussed. The results are compared to existing ones in th
e literature.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions
/2686/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2686/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Heavy flavor physics
DTSTART;VALUE=DATE-TIME:20160728T084500Z
DTEND;VALUE=DATE-TIME:20160728T091500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2685@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: ran zhou (Fermi National Accelerator Laboratory)\nHe
avy meson decays are used to extract the fundamental parameters\nin Standa
rd Model such as CKM matrix elements and probe new physics\nbeyond the Sta
ndard Model. Lattice QCD provides a non-perturbative\nmethod to calculate
the matrix elements in these processes. In this talk\, I\nwill review rec
ent progress in the study of B and D meson\ndecay constants\, semileptonic
decay form factors\, B and D meson mixing.\nIn addition\, I will present
the impact of lattice-QCD results\non phenomenology and compare the latest
Standard Model predictions\nwith the experimental results.\n\nhttps://con
ference.ippp.dur.ac.uk/event/470/contributions/2685/
LOCATION:University of Southampton\, Highfield Campus Building 32 (EEE) Ro
om 1015 and Building 67 (Nightingale) Room 1027 via video link
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2685/
END:VEVENT
BEGIN:VEVENT
SUMMARY:'t Hooft model on the lattice
DTSTART;VALUE=DATE-TIME:20160727T111000Z
DTEND;VALUE=DATE-TIME:20160727T113000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2684@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Antonio Gonzalez-Arroyo (Instituto de Fisica Teorica
UAM/CSIC)\nWe use a recently formulated expression for computing meson ma
sses at\nlarge N to study the spectrum of two-dimensional QCD in the large
N\nlimit. The model serves as a testing ground to explore methodology\nof
meson mass determination with different techniques and versions\nof latti
ce fermions.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/
2684/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2684/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Form factors from moments of correlation functions
DTSTART;VALUE=DATE-TIME:20160728T134000Z
DTEND;VALUE=DATE-TIME:20160728T140000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2683@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Chia Cheng Chang (LBNL)\nMomentum-space derivatives
of matrix elements can be related to their coordinate-space moments throug
h the Fourier transform. We derive these expressions as a function of mome
ntum transfer $Q^2$ for asymptotic in/out states consisting of a single ha
dron. We calculate corrections to the finite volume moments by studying t
he spatial dependence of the lattice correlation functions. This method p
ermits the computation of not only the values of matrix elements at moment
a accessible on the lattice\, but also the momentum-space derivatives\, pr
oviding *a priori* information about the $Q^2$ dependence of form factors.
As a specific application we use the method\, at a single lattice spacing
and with unphysically heavy quarks\, to directly obtain the slope of the
isovector form factor at various $Q^2$\, whence the isovector charge radiu
s. The method has potential application in the calculation of any hadronic
matrix element with momentum transfer\, including those relevant to hadro
nic weak decays.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributi
ons/2683/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2683/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$D$ meson semileptonic decays in lattice QCD with Moebius domain-w
all quarks
DTSTART;VALUE=DATE-TIME:20160729T132000Z
DTEND;VALUE=DATE-TIME:20160729T134000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2682@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Takashi Kaneko (KEK)\nWe report on our study of $D$
meson semileptonic decays\nin 2+1 flavor lattice QCD. Gauge ensembles are
generated\nat the lattice cutoffs around 2.5 GeV and above\nand at pion ma
sses as low as 300 MeV. We employ\nthe Moebius domain-wall action for both
light\nand charm quarks. We report our preliminary results for\nthe vecto
r and scalar form factors.\n\nhttps://conference.ippp.dur.ac.uk/event/470/
contributions/2682/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2682/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Finite size and infra-red effects in QCD plus QED
DTSTART;VALUE=DATE-TIME:20160727T082000Z
DTEND;VALUE=DATE-TIME:20160727T084000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2681@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Paul Rakow (University of Liverpool)\nWhen QED is ad
ded to QCD simulations we have to consider the effects of massless degrees
of freedom (the photons)\, which bring new problems which we did not have
to worry about in simulations of pure QCD. Related to this\, we have ques
tions about the boundary conditions - how can we reconcile periodic bounda
ry conditions with Gauss's Law? What is the best way of treating zero mode
s of the photon field?\n\n We combine data from our lattice simulation
s with perturbative calculations in the infra-red regime to gain insight i
nto some of these questions.\n\nhttps://conference.ippp.dur.ac.uk/event/47
0/contributions/2681/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2681/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice QCD on non-orientable manifolds - part I
DTSTART;VALUE=DATE-TIME:20160725T141500Z
DTEND;VALUE=DATE-TIME:20160725T143500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2680@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Simon Mages (Forschungszentrum Jülich)\nA common pr
oblem in lattice QCD simulations on the torus is the extremely long autoco
rrelation time of the topological charge\, when one approaches the continu
um limit. The reason is the suppressed tunneling between topological secto
rs. The problem can be addressed by replacing the torus with a different m
anifold. Here we propose to use a non-orientable manifold\, and show how t
o define and simulate lattice QCD on it. Part I focuses on the motivation
and general introduction of our construction.\n\nhttps://conference.ippp.d
ur.ac.uk/event/470/contributions/2680/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2680/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Spectrum of a prototype model with the Higgs as pNGB
DTSTART;VALUE=DATE-TIME:20160725T135500Z
DTEND;VALUE=DATE-TIME:20160725T141500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2679@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Claudio Rebbi (Boston University)\nWe present our re
sults for the spectrum and other observables of an \nSU(3) gauge theory wi
th 4 light fermions and 8 fermions of heavier mass\, \nbuilt on an IR fixe
d point. Our numerical data validate hyperscaling \nand\, while our model
does not presume to be a complete theory of EW \nsymmetry breaking\, it e
xhibits many of the features that would be \nexpected of a realistic theor
y where the Higgs emerges as a pNGB.\n\nhttps://conference.ippp.dur.ac.uk/
event/470/contributions/2679/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2679/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hadron Structure
DTSTART;VALUE=DATE-TIME:20160726T101500Z
DTEND;VALUE=DATE-TIME:20160726T110000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2678@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Sara Collins (University of Regensburg)\nRecent calc
ulations of hadron structure observables and related\ntechnical and theore
tical advances are reviewed. A wealth of\ninformation on the properties of
hadrons can be provided by lattice\nmethods such as their wavefunctions\,
response to electromagnetic\, weak\nor beyond the Standard Model probes a
nd their internal dynamics in\nterms of the contributions from quarks and
gluons. Progress in the\nevaluation of benchmark quantities which are well
determined from\nexperiment will be discussed\, along with the control of
systematics\nbefore highlighting recent calculations of more challenging
and less\nwell known observables.\n\nhttps://conference.ippp.dur.ac.uk/eve
nt/470/contributions/2678/
LOCATION:University of Southampton\, Highfield Campus Building 32 (EEE) Ro
om 1015 and Building 67 (Nightingale) Room 1027 via video link
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2678/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sextet Model with Wilson Fermions
DTSTART;VALUE=DATE-TIME:20160728T171000Z
DTEND;VALUE=DATE-TIME:20160728T173000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2677@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Martin Hansen (CP3-Origins\, University of Southern
Denmark)\nWe present new results from our ongoing study of the SU(3) "sext
et model" with two flavors in the 2-index symmetric representation of the
gauge group. The simulations use unimproved Wilson fermions and to address
the issue of whether or not the model is inside the conformal window\, we
measure the meson and baryon spectrum. To better understand the overall b
ehavior of the lattice model we map out the bare parameter space\, which r
eveals a non-trivial phase structure. At strong bare coupling\, a first or
der phase transition is observed as a function of the bare mass\, whereas
closer to the continuum limit this first order transition disappears. Our
study also shows that the behavior of mass spectrum (as a function of the
quark mass) changes significantly when moving away from the bulk phase and
into the weak coupling phase.\n\nhttps://conference.ippp.dur.ac.uk/event/
470/contributions/2677/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2677/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Electromagnetic corrections to the leptonic decay rates of charged
pseudoscalar mesons: lattice results
DTSTART;VALUE=DATE-TIME:20160727T111000Z
DTEND;VALUE=DATE-TIME:20160727T113000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2676@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Silvano Simula (INFN - Roma Tre)\nElectromagnetic ef
fects on the leptonic decay rates pi+ -> mu+ nu and K+ -> mu+ nu are evalu
ated for the first time on the lattice.\nFollowing a method recently propo
sed in Ref. [1] the emission of virtual photons at leading order in the e.
m. coupling is evaluated on the lattice with the subtraction of the infrar
ed divergence computed for a point-like meson at finite lattice volume. \n
The physical decay rate is then obtained by adding the emission of real ph
otons regularized with a photon mass.\nUsing the gauge ensembles produced
by ETMC with Nf=2+1+1 dynamical quarks the feasibility of the lattice appr
oach is demonstrated and preliminary results for the decay rates of charge
d pion and kaon will be presented.\n\n[1]. N. Carrasco et al.\, Phys. Rev.
D91 (2015) 074506.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contrib
utions/2676/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2676/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Systematic study of operator dependence in nucleus calculation at
large quark mass
DTSTART;VALUE=DATE-TIME:20160728T161000Z
DTEND;VALUE=DATE-TIME:20160728T163000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2675@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Takeshi Yamazaki (Univ. of Tsukuba)\nRecently it was
raised a possibility that calculation of the nucleus correlation function
s suffers from a significant systematic error due to excited state contrib
utions depending on the choice of the source operator.\nIn order to invest
igate the operator dependence of the nucleus correlation functions\,\nwe h
ave performed a high precision calculation employing the exponential smear
ed and \nwall operators at 0.7 GeV pion mass in 2+1 flavor QCD\, and 0.8 G
eV pion mass \nin quenched QCD.\nWe present preliminary results and discus
s the systematic errors caused by the choice of the source operator.\n\nht
tps://conference.ippp.dur.ac.uk/event/470/contributions/2675/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2675/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Baryon interactions in lattice QCD: the direct method vs. the HAL
QCD potential method
DTSTART;VALUE=DATE-TIME:20160728T153000Z
DTEND;VALUE=DATE-TIME:20160728T155000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2674@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Takumi Iritani (Stony Brook University)\nIn lattice
QCD\, both direct method for eigen-energy extraction and HAL QCD method f
or potential are employed so far to study hadron interactions. The scatte
ring phase shifts\, for example\, are obtained through the Luscher’s fin
ite volume formula for the former\,\nbut they are calculated via the Schro
edinger equation with the potential in the infinite volume for the latter.
\nAlthough both methods should agree in principle\, some systematically di
fferent conclusions are reported for existences of bound states in the pre
vious studies: while the potential shows no sign of the bound state in tw
o nucleon systems at heavier pion masses\, for example\, the eigen-energy
indicates its existence.\n\nIn this work\, we clarify that these discrepan
cies come from a failure of the eigen-energy extraction for the ground sta
te due to the contamination of excited states in time correlation function
s\, while the HAL QCD potential method is free from this problem.\nWe fin
ally establish consistencies between two lattice QCD approaches\, and prop
ose an improved extraction of eigen-energy for the time correlation functi
ons using energy eigen-functions obtained from the HAL QCD potential.\n\nh
ttps://conference.ippp.dur.ac.uk/event/470/contributions/2674/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2674/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-equilibration of topological charge and its effects
DTSTART;VALUE=DATE-TIME:20160726T144000Z
DTEND;VALUE=DATE-TIME:20160726T150000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2673@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Doug Toussaint (University of Arizona)\n[MILC collab
oration}\n\nIn QCD simulations at small lattice spacings the topological c
harge $Q$\nevolves very slowly\, and if this quantity is not properly equi
librated\nit could lead to incorrect results for physical quantities\, or
incorrect\nestimates of their errors. We use the known relation between t
he dependence\nof masses and decay constants on the QCD vacuum angle $\\th
eta$ and the\nsquared topological charge $Q^2$ together with chiral pertu
rbation theory\nresults for the dependence of masses and decay constants o
n $\\theta$ to\nestimate the size of these effects and suggest strategies
for dealing\nwith them. For the partially quenched case\, we sketch an alt
ernative\nderivation of the known $\\chi$PT results of Aoki and Fukaya\, u
sing the\nnonperturbative correct chiral theory worked out by Golterman\,
Sharpe and\nSingleton. With the MILC collaboration's ensembles of lattice
s with four\nflavors of HISQ dynamical quarks\, we measure the $Q^2$ depen
dence of masses\nand decay constants and compare to the $\\chi$PT forms.
The observed\nagreement gives us some confidence that we can reliably esti
mate the\nerrors from slow topology change\, and even correct for its\nlea
ding effects.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions
/2673/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2673/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Phase structure analysis of CP(N-1) model using Tensor renormaliza
tion group
DTSTART;VALUE=DATE-TIME:20160725T160500Z
DTEND;VALUE=DATE-TIME:20160725T162500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2672@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Hikaru Kawauchi (Kanazawa University)\nWe investigat
e the phase structure of the lattice CP(N-1) model in two dimensions by us
ing the tensor renormalization group (TRG) method. The TRG method has no s
ign problem even though the action is complex. We focus on the case N=2 an
d compare the numerical result of the TRG method with that of the strong-c
oupling analysis in the presence of the theta term.\n\nhttps://conference.
ippp.dur.ac.uk/event/470/contributions/2672/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2672/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Luescher's finite volume test for two-baryon systems with attracti
ve interactions
DTSTART;VALUE=DATE-TIME:20160728T155000Z
DTEND;VALUE=DATE-TIME:20160728T161000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2671@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Sinya Aoki (Yukawa Institute for Theoretical Physics
\, Kyoto University)\nSince the energy shift of two-baryon system due to t
he finite volume is negative for the attractive interaction\, the Lueshcer
's finite volume formula gives the phase shift at negative squared momentu
m\, $k^2 0$ to a real but negative $k^2$ in the infinite volume.\n\nIn th
is talk\, using the Lueshcer's finite volume formula for the phase shift\,
we reexamine behaviors of the phase shifts at $k^2\n\nhttps://conference.
ippp.dur.ac.uk/event/470/contributions/2671/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2671/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Results on the heavy-dense QCD phase diagram using complex Langevi
n
DTSTART;VALUE=DATE-TIME:20160726T130000Z
DTEND;VALUE=DATE-TIME:20160726T132000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2670@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Felipe Attanasio (Swansea University)\nComplex Lange
vin simulations have been able to successfully reproduce results from Mont
e Carlo methods in the region where the sign problem is mild and make pred
ictions when it is exponentially hard. We present here our study of the QC
D phase diagram in the limit of heavy and dense quarks (HDQCD) for 3 diffe
rent lattice volumes and the boundary between the hadronic phase and the q
uark-gluon plasma. We also briefly discuss instabilities encountered in ou
r simulations.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contribution
s/2670/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2670/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Leptonic decay-constant ratio $f_K/f_\\pi$ from clover-improved $N
_f=2+1$ QCD
DTSTART;VALUE=DATE-TIME:20160728T134000Z
DTEND;VALUE=DATE-TIME:20160728T140000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2669@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Enno E. Scholz (University of Regensburg)\nThe lepto
nic decay-constant ratio $f_K/f_\\pi$ is calculated from lattice-QCD simul
ations using $N_f=2+1$ dynamical fermion flavors in the clover-improved fo
rmulation and 2-HEX smearing. The simulations were performed at a range of
mass-degenerate light quarks including the physical point and at various
lattice couplings and volumes\, allowing to quantify all relevant sources
of systematic uncertainties for our final number of the decay-constant rat
io. Utilizing input from ChPT\, we also quote the charged decay-constant r
atio $f_{K^\\pm}/f_{\\pi^\\pm}$. With further input from super-allowed nuc
lear $\\beta$-decays\, eventually we obtain an estimate for the CKM-matrix
element $V_{\\rm us}$.\n\nhttps://conference.ippp.dur.ac.uk/event/470/con
tributions/2669/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2669/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Zero-momentum SU(2) gluon correlator at various boundary condition
s
DTSTART;VALUE=DATE-TIME:20160726T180000Z
DTEND;VALUE=DATE-TIME:20160726T190000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2668@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Igor Bogolubsky (Joint Institute for Nuclear Researc
h)\nWe make simulations of the zero-momentum $SU(2)$ Landau gauge gluon co
rrelator both for periodic and zero-field boundary conditions at varying $
\\beta$ and $L_t * L_s^3$ lattice sizes.\n\nhttps://conference.ippp.dur.ac
.uk/event/470/contributions/2668/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2668/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Abelian color cycles: a new approach to strong coupling expansion
and dual representation for non-abelian lattice gauge theory.
DTSTART;VALUE=DATE-TIME:20160729T163000Z
DTEND;VALUE=DATE-TIME:20160729T165000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2667@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Carla Marchis (University of Graz)\nWe present a dua
l approach for SU(2) lattice gauge theory\, i.e.\, an exact mapping of the
partition sum to new\, so-called dual variables. The dual representation
is constructed by decomposing the Wilson gauge action into “abelian colo
r cycles” (ACC)\, which are loops in color space around plaquettes. The
ACCs are complex numbers and as such commute\, such that a dual representa
tion can be obtained as in the abelian case. The original SU(2) degrees of
freedom are integrated out and the dual degrees of freedom are occupation
numbers of the ACCs\, subject to constraints reflecting the original SU(2
) symmetry.
The approach is then extended to the case of SU(2) gauge fi
elds with fermions. Analyzing the strong coupling region we show that the
system is free of sign problems up to $O(\\beta^3)$. The ACC concept can b
e generalized to other non-abelian gauge groups such as SU(3).\n\nhttps://
conference.ippp.dur.ac.uk/event/470/contributions/2667/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2667/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Strange Quark Magnetic Moment and Charge Radius of the Nucleon at
Physical Point
DTSTART;VALUE=DATE-TIME:20160726T180000Z
DTEND;VALUE=DATE-TIME:20160726T190000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2666@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Raza Sufian (University of Kentucky\, United States)
\nWe present a lattice QCD calculation of the strange quark contribution t
o the proton's magnetic moment and the charge radius at the physical pion
mass. The finite lattice spacing and finite volume corrections are include
d in a global fitting on three lattices with different lattice spacings\,
different volumes\, and three sea quark masses. We obtain the strange magn
etic moment $G^s_M(0) = - 0.073(17)\\\, \\mu_N$ and strange charge radius
$\\langle r^2_s\\rangle_E = -0.0047(22) \\\,\\text{fm}^2$. Additionally\,
we present our results of the disconnected $u$\, $d$-quarks contribution
to the proton's electromagnetic form factors.\n\nhttps://conference.ippp.d
ur.ac.uk/event/470/contributions/2666/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2666/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The multi-flavor Schwinger model with chemical potential - Overco
ming the sign problem with Matrix Product States
DTSTART;VALUE=DATE-TIME:20160725T162500Z
DTEND;VALUE=DATE-TIME:20160725T164500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2665@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Stefan Kühn (Max Planck Institute of Quantum Optics
)\nDuring recent years there has been quite some interest in applying Matr
ix Product States and more general tensor networks to lattice gauge theori
es in the Hamiltonian formulation. Previous work already demonstrated the
power of this approach by computing the mass spectrum and thermal sates fo
r the Schwinger model\, and also real-time dynamics for abelian and non-ab
elian gauge models have been successfully addressed in the meantime.\n\nIn
this talk we present ground state calculations for the two-flavor Schwing
er model with finite chemical potential using Matrix Product States. While
the conventional Monte Carlo approach suffers from the sign problem\, our
numerical simulations with Matrix Product States reliably reproduce analy
tic results for the massless case by Narayanan [Phys. Rev. D 86\, 125008 (
2012)] and readily extend to the massive case\, where no analytic predicti
on is available.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributi
ons/2665/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2665/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The leading order hadronic contribution of the anomalous magnetic
moment of the muon with O$(a)$-improved Wilson fermions with Pade approxim
ants from fits and time moments
DTSTART;VALUE=DATE-TIME:20160726T134000Z
DTEND;VALUE=DATE-TIME:20160726T140000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2664@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Hanno Horch (University of Mainz)\nWe present result
s of our lattice QCD study of the hadronic vacuum polarization (HVP) \nfun
ction with O$(a)$-improved $N_{\\rm f}=2$ Wilson fermions with twisted bou
ndary \nconditions. We discuss the extraction of the leading order hadroni
c contribution to the \nanomalous magnetic moment of the muon $\\left(a_\\
mu^{\\mathrm{HLO}}\\right)$ via the\nhybrid method involving two steps: (i
) To describe the low $Q^2$ range\, we construct\nPade approximants obtain
ed either from correlated fits to the HVP or from time moments\, \nwhich w
e obtain from derivatives of the current-current correlator.(ii) For the l
arge \n$Q^2$ range we use a numerical integration. We estimate systematic
uncertainties \nof the continuum and chiral extrapolations with the extend
ed frequentist method. \nPreliminary results for $u\,d\,s$ and $c$ valence
quarks at the physical point for \n$a_\\mu^{\\mathrm{HLO}}$ will be prese
nted.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2664/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2664/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The spectra of (closed) confining flux tubes in D=3+1 and D=2+1 SU
(N) gauge theories.
DTSTART;VALUE=DATE-TIME:20160729T142000Z
DTEND;VALUE=DATE-TIME:20160729T144000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2663@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Michael Teper (University of Oxford)\nWe summarise t
he most striking features of the spectra of closed\nconfining flux tubes\,
for the flux in the fundamental\nand some other representations. We compa
re to recent theoretical\npredictions. In $D=2+1$ we present results for t
he continuum string\ntensions for theories ranging from SU(2) to SU(16) an
d we determine\nthe leading correction to the N-dependence of k-strings.\n
\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2663/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2663/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Vus from inclusive determinations based on hadronic tau data
DTSTART;VALUE=DATE-TIME:20160728T142000Z
DTEND;VALUE=DATE-TIME:20160728T144000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2662@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Kim Maltman (York University)\nWe discuss the curren
t status of the determination of V_us based on\nflavor-breaking finite ene
rgy sum rule analyses of non-strange and\nstrange hadronic tau decay data\
, highlighting the role of lattice\ninput in providing a means of investig
ating the reliability of the\nOPE representation for the relevant flavor-b
reaking polarization\ncombination employed in this analysis\, and in quant
ifying the associated\ntheoretical errors on V_us. We present results for
V_us based on an\nnew implementation this approach motivated by continuum
and lattice\nstudies and show that this resolves the long-standing problem
of\nV_us values more than 3 sigma low compared to 3-family unitarity\nexp
ectations obtained in earlier implementations of this approach.\nWe also d
iscuss the practical limitations of this new implementation\ngiven what ne
ar-term improvements are likely in the experimental\nstrange decay distrib
utions\, and\, motivated by these limitations\,\npropose a new method for
obtaining V_us which involves dispersive\nanalyses of the strange hadronic
tau decay data alone in which\nlattice results for the relevant combinati
on of the flavor us\nJ=0 and 1 vector and axial vector polarizations can b
e used in place\nof the OPE. Details of the practical implementation of th
is approach\,\nas well as preliminary results for V_us\, will be presented
in\nthe accompanying talk by Hiroshi Ohki.\n\nhttps://conference.ippp.dur
.ac.uk/event/470/contributions/2662/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2662/
END:VEVENT
BEGIN:VEVENT
SUMMARY:pMR: A high-performance communication library
DTSTART;VALUE=DATE-TIME:20160726T190000Z
DTEND;VALUE=DATE-TIME:20160726T200000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2661@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Peter Georg (University of Regensburg)\nOn many para
llel machines\, the time LQCD applications spend in communication is a sig
nificant contribution to the total wall-clock time\, especially in the str
ong-scaling limit.\nWe present a novel high-performance communication libr
ary that can be used as a de facto drop-in replacement in existing softwar
e.\nIts lightweight nature that avoids some of the unnecessary overhead in
troduced by MPI allows us to improve the communication performance of an a
pplication without any algorithmic or complicated implementation changes.\
nAs a first real-world benchmark\, we make use of the library in the coars
e grid solve of the DD-\\alphaAMG algorithm.\nOn realistic lattices\, we s
ee an improvement of a factor 2x in pure communication time and total time
savings of up to 20%.\n\nhttps://conference.ippp.dur.ac.uk/event/470/cont
ributions/2661/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2661/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Temperature dependence of shear viscosity in SU(3)-gluodynamics
DTSTART;VALUE=DATE-TIME:20160729T165000Z
DTEND;VALUE=DATE-TIME:20160729T171000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2660@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Victor Braguta (ITEP)\nThis report is devoted to the
study of temperature dependence of shear viscosity in SU(3)-gluodynamics.
\nTo calculate shear viscosity we measured the correlation function of th
e energy-momentum tensor\nT_{12}T_{12} for a set of temperatures in the re
gion T/T_c \\in (0.9\, 1.5). The measurements \nwere carried out using mu
ltilevel algorithm which considerably improves the accuracy \nof the data.
The results of the calculation allow to determine temperature dependence
of \nthe ratio of shear viscosity to the entropy density {\\eta}/s.\n\nhtt
ps://conference.ippp.dur.ac.uk/event/470/contributions/2660/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2660/
END:VEVENT
BEGIN:VEVENT
SUMMARY:First Lattice QCD Study of Gluonic Transversity
DTSTART;VALUE=DATE-TIME:20160729T153000Z
DTEND;VALUE=DATE-TIME:20160729T155000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2659@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Phiala Shanahan (Massachusetts Institute of Technolo
gy)\nWe present the first lattice QCD study of the double-helicity-flip le
ading-twist gluonic structure function ∆(x\,Q2). In particular\, we calc
ulate its leading moment in a φ meson and find a robust signal. This quan
tity is particularly interesting since\, unlike the unpolarised and helici
ty gluon distributions\, the double-helicity-flip density is a clean measu
re of gluonic degrees of freedom as it only mixes with quark distributions
at higher twist.\nWe also explore the gluon structure of the φ meson in
more general terms\, including the first investigation of the direct gluon
ic analogue of the Soffer bound for transversity which relates the helicit
y flip and non-flip gluon distributions. We find that the first moment of
this bound in a φ meson (at the unphysical light quark masses used in thi
s work and subject to caveats regarding renormalisation and the continuum
limit) is saturated to approximately\nthe same extent as the first moment
of the isovector quark Soffer bound for the nucleon as determined in a pre
vious lattice simulation.\nThis constitutes a proof-of-feasibility of latt
ice QCD calculations of complicated aspects of the gluon structure of hadr
ons. Our investigations can be extended to light nuclei where ∆(x\,Q2) p
rovides a measure of ‘exotic glue’ (gluons in the nucleus not associat
ed with individual nucleons)\, as well as to off-forward gluon transversit
y matrix elements in the nucleon.\n\nhttps://conference.ippp.dur.ac.uk/eve
nt/470/contributions/2659/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2659/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Flux Tubes in QCD with (2+1) HISQ Fermions
DTSTART;VALUE=DATE-TIME:20160729T144000Z
DTEND;VALUE=DATE-TIME:20160729T150000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2658@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Leonardo Cosmai (INFN)\nWe investigate the transvers
e profile of the chromoelectric field\ngenerated by a quark-antiquark pair
in the vacuum of (2+1) flavor QCD.\nMonte Carlo simulations are performed
adopting the HISQ/tree action \ndiscretization\, as implemented in the pu
blicly available MILC code\, \nsuitably modified to measure the chromoelec
tric field. \nWe work on the line of constant physics\, with physical stra
nge quark mass\nm_s and light to strange mass ratio m_l/m_s = 1/20.\n\nhtt
ps://conference.ippp.dur.ac.uk/event/470/contributions/2658/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2658/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Precision test of the gauge/gravity duality in two-dimensional N=(
8\,8) SYM
DTSTART;VALUE=DATE-TIME:20160729T144000Z
DTEND;VALUE=DATE-TIME:20160729T150000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2657@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Daisuke Kadoh (Keio Univ.)\nWe present a precision t
est of the gauge gravity duality in two-dimensional N=(8\,8) SYM. We emplo
y the Sugino lattice action to perform lattice simulations of N=(8\,8) SYM
at finite temperature. We show the evidence of validity of the duality co
njecture by comparing lattice results with analytical predictions of the c
orresponding gravitational theory.\n\nhttps://conference.ippp.dur.ac.uk/ev
ent/470/contributions/2657/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2657/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Squared width and profile of the confining fluxtube in the U(1) LG
T in 3D
DTSTART;VALUE=DATE-TIME:20160729T134000Z
DTEND;VALUE=DATE-TIME:20160729T140000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2656@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Vadacchino Davide (Universita' degli Studi di Torino
- INFN Torino)\nThe dual formulation of the compact U(1) lattice gauge th
eory in three spacetime dimensions allows to finely study the squared widt
h and the profile of the confining fluxtube on a wide range of physical in
terquark distances. The results obtained in Montecarlo simulations are com
pared with the predictions of the effective bosonic-string model and with
the dual superconductor model. While the former fails at describing the da
ta from a quantitative point of view\, the latter is in good agreement wit
h it. An interpretation of these results is proposed in light of the parti
cular features of the U(1) LGT in 3D and a comparison with non-Abelian gau
ge theories in four spacetime dimensions is discussed.\n\nhttps://conferen
ce.ippp.dur.ac.uk/event/470/contributions/2656/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2656/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Impact of dynamical charm quarks
DTSTART;VALUE=DATE-TIME:20160728T134000Z
DTEND;VALUE=DATE-TIME:20160728T140000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2655@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Tomasz Korzec (Bergische Universität Wuppertal)\nWe
investigate the influence of dynamical charm quarks on various observable
s. For observables without explicit charm-quark dependence\, decoupling ap
plies and the effects are expected to be small. However\, we also study qu
antities with explicit charm-quark dependence\, like the charmonium mass s
pectrum\, where decoupling does not apply. \n\nOur study puts an emphasis
on careful continuum extrapolations\, which require very small lattice spa
cings when heavy quarks are present in the action. Since our precision goa
ls cannot be currently met in full QCD\, we carry our investigations out i
n a model without light quarks\; quenched QCD is compared to QCD with two
dynamical heavy quarks.\n\nhttps://conference.ippp.dur.ac.uk/event/470/con
tributions/2655/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2655/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Glueball spectrum from $N_f=2$ lattice QCD study on anisotropic la
ttices
DTSTART;VALUE=DATE-TIME:20160726T165000Z
DTEND;VALUE=DATE-TIME:20160726T171000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2654@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Ying Chen (Institute of High Energy Physics\, CAS)\n
The glueball spectrum is investigated through a $N_f=2$ lattice QCD study.
The gauge\nconfigurations are generated with two degenerate flavors of qu
arks on anisotropic lattices. At two pion masses\, say\, $m_\\pi=580$ MeV
and $920$ MeV\, we obtain the masses of the scalar\, the tensor glueballs\
, which are in agreement with the results from the previous quenched and u
nquenched lattice QCD studies. For the pseudoscalar channel\, we can get a
state of mass roughly 2.4-2.5 GeV by the use of the gluonic lattice opera
tors whose continuum counterparts are $\\epsilon_{ijk}B_i^a(D_j B_k)^a$. T
his state is compatible with the pseudoscalar glueball from the previous q
uenched lattice QCD studies. We do not observe a clear quark mass dependen
ce of the masses of these states. We also calculate the correlation functi
ons of the topological charge density adopting the gradiant flow smearing
scheme. We can seemingly observe a state with a mass around 1 GeV\, but fa
il to obtain a definite result owing to our coarse and small lattices. Thi
s state might be the isoscalar $q\\bar{q}$ pseudoscalar meson\, the $SU(2)
$ counterpart of the $SU(3)$\nflavor singlet $\\eta'$.\n\nhttps://conferen
ce.ippp.dur.ac.uk/event/470/contributions/2654/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2654/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Near threshold states $D_{s0}^{*}\\left(2317\\right)$ and $D_{s1}\
\left(2460\\right)$
DTSTART;VALUE=DATE-TIME:20160728T144000Z
DTEND;VALUE=DATE-TIME:20160728T150000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2653@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Antonio Cox (University of Regensburg)\nEarly theore
tical studies and lattice simulations predicted the charmed-strange mesons
$D_{s0}^{*}(2317)$ and $D_{s1}(2460)$ to be broad states lying above the
thresholds\, $DK$ and $D^{*}K$\, respectively. Experiments found narrow st
ates below threshold. We present results of a high statistics $Nf=2$ study
with a lattice spacing of approximately $0.071$ fm\, taking explicitly in
to account the thresholds by including four quark operators. We find a low
ering of the meson’s masses relative to the two-quark operator results.
Two pion masses with multiple volumes were employed\, $Lm_{\\pi}=2.5\,3.4\
,4.2$ and $6.7$ at $m_{\\pi}=289$ MeV and $Lm_{\\pi}=2.8$ and $3.5$ at $m_
{\\pi}=150$ MeV. The volume dependence of the resulting spectrum is invest
igated according to Luescher’s formula.\n\nhttps://conference.ippp.dur.a
c.uk/event/470/contributions/2653/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2653/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Charm physics by $N_f=2+1$ Iwasaki gauge and the six stout smeared
$O(a)$-improved Wilson quark actions on a $96^4$ lattice
DTSTART;VALUE=DATE-TIME:20160728T130000Z
DTEND;VALUE=DATE-TIME:20160728T132000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2652@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Yusuke Namekawa (University of Tsukuba)\nWe present
our results of charm physics in\n$N_f=2+1$ lattice QCD. Our calculation is
\nperformed on configurations generated\nwith Iwasaki gauge and the six st
out smeared\n$O(a)$-improved Wilson quark actions on a $96^4$ lattice\nat
$\\beta=1.82$ ($a^{-1} = 2.3$ GeV) with the spatial\nextent $L=8.1$ fm. Th
e pion mass is almost physical\n$m_\\pi=145$~MeV. The relativistic heavy q
uark action\nis utilized for the charm quark.\nWe exhibit the charmed spec
trum and the charm\nquark mass\, focusing on stout smearing influence.\n\n
https://conference.ippp.dur.ac.uk/event/470/contributions/2652/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2652/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Block Solver for multiple right hand sides on NVIDIA GPUs
DTSTART;VALUE=DATE-TIME:20160728T132000Z
DTEND;VALUE=DATE-TIME:20160728T134000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2651@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Mathias Wagner (NVIDIA)\nAnalysis tasks in Lattice Q
CD often requires solving linear equations for multiple right hand sides f
or a constant gauge field. Recently deflation methods have become more wid
ely used and proven to be very efficient. They however do require the calc
ulation and storing of eigenvectors which is either not always feasible or
too expensive. Here we present results for an implementation of a block s
olver for multiple right hand sides using the QUDA library for QCD on NVID
IA GPUs. By making use of the gauge field reuse in the Dslash operator\, m
ixed precision approaches and block Krylov space methods they do provide o
utstanding solver performance. We present results on NVIDIA's most recent
Pascal architecture.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contri
butions/2651/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2651/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Form factors in the $B_s --> K l \\nu$ decays using HQET and the l
attice
DTSTART;VALUE=DATE-TIME:20160729T165000Z
DTEND;VALUE=DATE-TIME:20160729T171000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2650@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Debasish Banerjee (NIC\, DESY)\nWe report on a recen
t computation of the form factors in semi-leptonic decays of the $B_s$ usi
ng Heavy Quark Effective Theory (HQET) formalism applied on the lattice. T
he connection of the form factors with the 2-point and 3-point correlators
on the lattice is explained\, and the subsequent non-perturbative renorma
lization of HQET and it's matching to $N_f=2$ QCD is outlined. The results
of the (static) leading-order calculation in the continuum limit is prese
nted. Preliminary results on extending the leading-order computation by in
cluding the $1/m$ effects (where m is the heavy-quark mass) are mentioned.
\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2650/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2650/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gradient flow observables and boundary O(a) improvement of the Sc
hroedinger functional
DTSTART;VALUE=DATE-TIME:20160726T190000Z
DTEND;VALUE=DATE-TIME:20160726T200000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2649@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Argia Rubeo (TCD (Trinity College Dublin))\nThe grad
ient flow provides a new class of renormalized observables which \ncan be
measured with high precision in lattice simulations. In principle \nthis a
llows to improve lattice actions a la Symanzik by requiring such \nobserva
bles to take their continuum values already at finite lattice \nspacing. A
t lowest order of perturbation theory we here try to identify \nsuch impro
vement conditions for the O(a) counterterm at the Schroedinger \nfunctiona
l boundaries. We study the action density\, E(t\,x)\, separately \nfor col
our electric and magnetic components and with different \ndiscretizations
of the observable and the flow.\n\nhttps://conference.ippp.dur.ac.uk/event
/470/contributions/2649/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2649/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice QCD on non-orientable manifolds - part II
DTSTART;VALUE=DATE-TIME:20160725T143500Z
DTEND;VALUE=DATE-TIME:20160725T145500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2648@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Balint Toth (Bergische Universität Wuppertal)\nA co
mmon problem in lattice QCD simulations on the torus is the extremely long
autocorrelation time of the topological charge\, when one approaches the
continuum limit. The reason is the suppressed tunneling between topologica
l sectors. The problem can be addressed by replacing the torus with a diff
erent manifold. Here we propose to use a non-orientable manifold\, and sho
w how to define and simulate lattice QCD on it. Part II focuses on special
issues like the implementation of fermions on a non-orientable manifold.\
n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2648/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2648/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On the accuracy of perturbation theory in QCD
DTSTART;VALUE=DATE-TIME:20160725T154500Z
DTEND;VALUE=DATE-TIME:20160725T160500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2647@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Stefan Sint (Trinity College Dublin)\nA collaborativ
e effort to determine the $\\Lambda$-parameter in 3-flavour QCD by the ALP
HA collaboration is currently being finalized. The strategy involves 2 fin
ite volume schemes for the coupling\, both defined with Schroedinger funct
ional (SF) boundary conditions. I here discuss the scale evolution from a
n intermediate scale $1/L_0$ of about 4 GeV to scales of O(100) GeV using
the traditional SF coupling and a 1-parameter family of close relatives.
Our precise continuum extrapolated data allows for stringent tests of pert
urbation theory\, which is then used to extract $L_0*\\Lambda$ with an err
or below 3 per cent. To quote such a small error with confidence\, non-per
turbative data is required around alpha_s = 0.1. In particular\, we have e
vidence that the apparent precision reached with data around alpha_s = 0.2
can be misleading.\n\n(cf. related talks by A. Ramos and R. Sommer)\n\nht
tps://conference.ippp.dur.ac.uk/event/470/contributions/2647/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2647/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Triple-gluon and quark-gluon vertex from lattice QCD in Landau gau
ge
DTSTART;VALUE=DATE-TIME:20160729T165000Z
DTEND;VALUE=DATE-TIME:20160729T171000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2646@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Andre Sternbeck (University of Jena)\nWe report on n
ew results for the triple-gluon and the quark-gluon vertex in Landau gauge
. Our results are based on two-flavor and quenched lattice QCD calculation
s for different quark masses\, lattice spacings and\nvolumes. We will focu
s on the momentum dependence of the different tensor structures.\n\nhttps:
//conference.ippp.dur.ac.uk/event/470/contributions/2646/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2646/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hadron Structure from the Feynman-Hellmann Theorem
DTSTART;VALUE=DATE-TIME:20160725T160500Z
DTEND;VALUE=DATE-TIME:20160725T162500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2645@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Alexander Chambers (University of Adelaide)\nAlthoug
h hadron structure calculations in lattice QCD\nhave improved greatly in r
ecent years\,\nmany problems still remain.\nVarious techniques for determi
ning fermion line disconnected contributions to\nmatrix elements have prod
uced exciting and promising results\, but\nrely on complicated analyses.\n
Additionally\, calculations of electromagnetic form factors at high\nmomen
tum transfers remain limited by low signal-to-noise ratios.\n\nIn this tal
k we present results from Feynman-Hellmann motivated approaches\nto determ
inations of these quantities.\nWe find disconnected contributions to $\\De
lta \\Sigma$ consistent with\nstochastic calculations\, and are able to ac
cess\nsignificantly higher momentum transfers for electromagnetic form\nfa
ctors than have previously been feasible.\nIn conjunction with experimenta
l data\, these results may reveal interesting information\nregarding the p
ossibility of a zero crossing in the ratio of electric\nand magnetic form
factors in the nucleon.\n\nhttps://conference.ippp.dur.ac.uk/event/470/con
tributions/2645/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2645/
END:VEVENT
BEGIN:VEVENT
SUMMARY:New polynomially exact integration rules on U(N) and SU(N)
DTSTART;VALUE=DATE-TIME:20160725T170500Z
DTEND;VALUE=DATE-TIME:20160725T172500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2644@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Tobias Hartung (King's College London)\nIn lattice Q
FT\, we are often presented with integrals over polynomials of coefficient
s of matrices in $U(N)$ or $SU(N)$ with respect to the Haar measure. In so
me physical situations\, e.g.\, in presence of a chemical potential\, thes
e integrals are\, however\, numerically very difficult since they are high
ly oscillatory which manifests itself in form of the sign problem. In thes
e cases\, Monte Carlo methods often fail to be adequate\, rendering such c
omputations practically impossible.\n\nIn this talk\, we will propose a ne
w class of polynomially exact integration rules on $U(N)$ and $SU(N)$ whic
h are derived from polynomially exact rules on spheres. We will examine th
ese quadrature rules and their efficiency at the example of a $0+1$ dimens
ional QCD for a non-zero quark mass and chemical potential. In particular\
, we will demonstrate the failure of Monte Carlo methods in such applicati
ons but that we can obtain arbitrary precision results using the new polyn
omially exact integration rules.\n\nhttps://conference.ippp.dur.ac.uk/even
t/470/contributions/2644/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2644/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Applying recursive numerical integration techniques for solving hi
gh dimensional integrals
DTSTART;VALUE=DATE-TIME:20160726T140000Z
DTEND;VALUE=DATE-TIME:20160726T142000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2643@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Julia Volmer (DESY Zeuthen)\nThe error scaling for M
arkov Chain - Monte Carlo techniques (MC-MC)\nwith $N$ samples behaves lik
e $\\frac{1}{\\sqrt{N}}$. This scaling makes\nit often very time intensive
to reduce the error of calculated\nobservables\, in particular for applic
ations in lattice QCD. \nIt is therefore highly desirable to have alternat
ive methods at hand\nwhich show an improved error scaling. One candidate f
or such an\nalternative integration technique is the method of recursive n
umerical\nintegration (RNI). The basic idea of this method is to use Gauss
quadrature with Legendre polynomials and apply it iteratively to integrat
e over observable and\nBoltzmann weight. \nIn this talk we will present th
e application of such an algorithm to\nthe topological rotor and the anhar
monic oscillator and compare the\nerror scaling to MC-MC results. In parti
cular\, we demonstrate that the\nRNI technique shows an error scaling in $
N$ that is at least\nexponential.\n\nhttps://conference.ippp.dur.ac.uk/eve
nt/470/contributions/2643/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2643/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Platform Independent Profiling of a QCD Code
DTSTART;VALUE=DATE-TIME:20160726T180000Z
DTEND;VALUE=DATE-TIME:20160726T190000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2642@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Marina Krstic Marinkovic (CERN)\nThe supercomputing
platforms available for high performance computing based research evolve a
t a great rate. However\, this rapid development of novel technologies req
uires adaptations and optimizations of the existing codes for each new mac
hine architecture. In such context\, minimizing time of efficiently portin
g the code on a new platform is of crucial importance. A possible solution
is to use coarse grain simulations of the application that can assist in
detecting performance bottlenecks. We present a procedure of implementing
the intermediate profiling for openQCD code that will enable the global re
duction of the cost of profiling and optimizing this code commonly used in
the lattice QCD community. Our approach is based on well-known SimGrid si
mulator\, which allows for fast and accurate performance predictions of th
e codes on HPC architectures. Additionally\, accurate estimations of the p
rogram behavior on some future machines\, not yet accessible to us\, are a
nticipated.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2
642/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2642/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Staggered domain wall fermions
DTSTART;VALUE=DATE-TIME:20160725T143500Z
DTEND;VALUE=DATE-TIME:20160725T145500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2641@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Christian Hoelbling (Wuppertal University)\nWe const
ruct domain wall fermion operators with a staggered kernel and investigate
their spectral and chiral properties numerically in the Schwinger model.
In some relevant cases we see an improvement of chirality by more than an
order of magnitude compared to standard domain wall fermions.\n\nhttps://c
onference.ippp.dur.ac.uk/event/470/contributions/2641/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2641/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon form factors and couplings with $N_{\\mathrm f}=2+1$ Wilso
n fermions
DTSTART;VALUE=DATE-TIME:20160728T155000Z
DTEND;VALUE=DATE-TIME:20160728T161000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2640@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Tim Harris (Helmholtz-Institut Mainz)\nWe present up
dated results on the isovector electromagnetic form factors and axial coup
ling of the nucleon calculated using the CLS ensembles with $N_{\\mathrm f
}=2+1$ flavours of Wilson fermions. Systematic effects are investigated by
covering a range of lattice spacings and pseudoscalar masses. Efficient v
ariance reduction is achieved with the truncated solver method. The strate
gy to renormalize nucleon matrix elements with the Rome-Southampton method
is discussed.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contribution
s/2640/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2640/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theta dependence in the large N limit
DTSTART;VALUE=DATE-TIME:20160729T130000Z
DTEND;VALUE=DATE-TIME:20160729T132000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2639@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Claudio Bonati (Università di Pisa)\nStudies of the
large N behaviour of the topological properties of gauge theories typical
ly focused on the large N scaling of the topological susceptibility. A muc
h more difficult task is the study of the behaviour of higher cumulants of
the topological charge in the large N limit\, which up to now remained el
usive. We will present first results confirming the expected large N scal
ing of the coefficient commonly denoted by b_2\, related to the kurtosis o
f the topological charge.\n\nhttps://conference.ippp.dur.ac.uk/event/470/c
ontributions/2639/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2639/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Numerical determination of the $\\Lambda$-parameter in SU(3) gauge
theory from the twisted gradient flow coupling
DTSTART;VALUE=DATE-TIME:20160725T170500Z
DTEND;VALUE=DATE-TIME:20160725T172500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2638@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Ryoichiro Ueno (Graduate School of Science\, Hiroshi
ma University)\nWe calculate the $\\Lambda$-parameter in $\\overline{\\mat
hrm{MS}}$ scheme for SU(3) pure gauge theory with the twisted gradient flo
w method non-perturbatively. Using the Schrödinger functional scheme as a
n intermediate scheme\, we numerically evaluate the $\\Lambda$-parameter r
atio $\\frac{\\Lambda_{\\overline{\\mathrm{MS}}}}{\\Lambda_{\\mathrm{TGF}}
}=\\frac{\\Lambda_{\\overline{\\mathrm{MS}}}}{\\Lambda_{\\mathrm{SF}}}\\cd
ot\\frac{\\Lambda_{\\mathrm{SF}}}{\\Lambda_{\\mathrm{TGF}}}$. We also esti
mate $\\Lambda_{\\mathrm{TGF}}/\\sqrt{\\sigma}$ and $r_{0}\\Lambda_{\\math
rm{TGF}}$ from $a\\sqrt{\\sigma}$ and $a/r_{0}$ available in the literatur
e. Our final values $\\Lambda_{\\overline{\\mathrm{MS}}}/\\sqrt{\\sigma}$
and $r_{0}\\Lambda_{\\overline{\\mathrm{MS}}}$ are consistent with the kno
wn results\, which demonstrates the validity of the present method.\n\nhtt
ps://conference.ippp.dur.ac.uk/event/470/contributions/2638/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2638/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Decay constants $f_B$ and $f_{B_s}$ and quark masses $m_b$ and $m_
c$ from HISQ simulations
DTSTART;VALUE=DATE-TIME:20160729T153000Z
DTEND;VALUE=DATE-TIME:20160729T155000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2637@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Claude Bernard (Washington University)\, Javad Komij
ani (Technische Universit\\"at M\\"unchen)\nWe present high-precision resu
lts for the decay constants $f_B$ and $f_{B_s}$ from simulations with HISQ
heavy and\nlight valence and sea quarks. Calculations are carried out wi
th several heavy valence-quark masses on ensembles with\n2+1+1 flavors of
HISQ sea quarks. We generate data at five lattice spacings with three lig
ht sea quark mass ratios\,\nincluding an approximately physical ensemble a
t every lattice spacing. This range of parameters provides excellent\ncont
rol of the continuum limit and of heavy-quark discretization errors. In ad
dition to the decay constants\, we present \nresults for charm- and bottom
-quark masses extracted from heavy-light meson masses using an approach ba
sed on HQET.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/
2637/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2637/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Baryon interactions from lattice QCD with physical masses -- S=-3
sector: XiSigma & XiLambda-XiSigma --
DTSTART;VALUE=DATE-TIME:20160729T132000Z
DTEND;VALUE=DATE-TIME:20160729T134000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2636@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Noriyoshi Ishii (Research Center for Nuclear Physics
(RCNP)\, Osaka University)\nNucleon-Nucleon interaction plays an ess
ential role in nuclear\nphysics. In the same way\, hyperon-hyperon int
eractions should play an\nimportant role in hyper nuclear physics. Howeve
r\, unlike the nucleons\nwhich are quite stable\, hyperons decay quickl
y so that the direct\nscattering experiments are difficult. As a resu
lt\, phenomenological\ndetermination of hyperon potentials involves larg
e uncertainly. In\nthis talk\, by using the gauge configurations at the
(almost) physical\npoint (m(pi)=146 MeV) on a huge spatial lattice (8fm
)^4\, we present\nour latest result on the hyperon-hyperon potentials f
or S=-3 sector\n(XiSigma & XiSigma-XiLambda) from the Nambu-Bethe-S
alpeter wave\nfunctions based on the HAL QCD method.\n\nhttps://conferenc
e.ippp.dur.ac.uk/event/470/contributions/2636/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2636/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chiral condensate from OPE of the overlap quark propagator
DTSTART;VALUE=DATE-TIME:20160725T135500Z
DTEND;VALUE=DATE-TIME:20160725T141500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2635@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Zhaofeng LIU (Institute of High Energy Physics\, Chi
nese Academy of Sciences\, Beijing)\nUsing 2+1-flavor domain wall fermion
configurations\, we calculate the overlap quark propagator in the Landau g
auge. Then we try to extract the chiral condensate from the operator produ
ct expansion of the quark propagator in momentum space.\n\nhttps://confere
nce.ippp.dur.ac.uk/event/470/contributions/2635/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2635/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The scalar sector of $SU(2)$ gauge theory with $N_F=2$ fundamental
flavours
DTSTART;VALUE=DATE-TIME:20160725T131500Z
DTEND;VALUE=DATE-TIME:20160725T133500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2634@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: vincent Drach (CERN)\nWe present a non perturbative
study of SU(2) gauge theory with two\nfundamental Dirac flavours.\nThis th
eory provides a minimal template which is ideal for a wide\nclass of Stand
ard Model extensions featuring novel strong dynamics.\nAfter reviewing our
findings for the Goldstone bosons and spin-1\nspectrum\, we present our n
ew results for the sigma and eta states.\nWe evaluate the relevant disconn
ected contributions and obtain\nbenchmark results that are crucial input f
or model building.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contribu
tions/2634/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2634/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Relaxation time of the fermions in the magnetic field (I) - the ca
se for relativistic fermions -
DTSTART;VALUE=DATE-TIME:20160726T190000Z
DTEND;VALUE=DATE-TIME:20160726T200000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2633@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Aya Kagimura (Osaka University)\nThe chiral magnetic
effect (CME) is the quantum anomaly related electric charge transport phe
nomenon along the external magnetic field\, which appears in various syste
ms possessing chiral fermions\, such as the quark-gluon plasma\, condensed
matter physics and astrophysics. \n\nThe magnetic field dependence of the
relaxation time is needed to compare the theory and experiments quantitat
ively. However\, the model calculation of the relaxation time has been mad
e by Argyres and Adams only for the non-relativisitic fermion with the str
ong magnetic field limit.\nIn this poster\, we extend the work by Argyres
and Adams and compute the relaxation time for the relativistic fermions in
the magnetic field.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contri
butions/2633/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2633/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Calculation of Quark Condensates and Chirality using Improved Stag
gered Fermions
DTSTART;VALUE=DATE-TIME:20160726T180000Z
DTEND;VALUE=DATE-TIME:20160726T190000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2632@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Hwancheol Jeong (Seoul National University)\nWe stud
y quark condensates using improved staggered fermions\, where\nzero modes
of the Dirac operator give simple poles in the chiral\nlimit. We present a
new method to identify the zero modes and\nto subtract their contribution
from the quark condensates. \nMeanwhile we also identify the quantum numb
ers of \nthe zero modes in the staggered fermion formalism\, \nusing the s
pectral flow method. \nAll the numerical results are calculated using \nHY
P-smeared staggered fermions on MILC asqtad lattices \nand on MILC HISQ la
ttices.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2632/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2632/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The coupled channel approach to the Lambda_c N - Sigma_c N system
in lattice QCD
DTSTART;VALUE=DATE-TIME:20160728T165000Z
DTEND;VALUE=DATE-TIME:20160728T171000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2631@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Takaya for HAL QCD Collaboration Miyamoto (Yukawa In
stitute for Theoretical Physics\, Kyoto University)\nWe investigate the 2-
baryon system with the isospin 1/2 \nincluding one charm quark\, namely\,
$\\Lambda_c N$ and $\\Sigma_c N$.\nAlthough this system is similar to the
$\\Lambda N$ and $\\Sigma N$ system\,\nthe interaction of this charmed 2-b
aryon system above $\\Sigma_c N$ threshold \nmight be quite different from
its hyperon counter part\, due to the smaller mass splitting \nbetween $\
\Sigma_c$ and $\\Sigma_c^*$ than $\\Sigma$ and $\\Sigma^*$\, \nwhich is co
nsequence of the heavy quark spin symmetry. \nTo explore this possibility\
, we calculate the coupled channel potential \nfor charmed 2-baryon system
using the HAL QCD method in lattice QCD. \nTo avoid the discretization er
ror coming from the heavy quark mass\, we employ \nthe Relativistic Heavy
Quark (RHQ) action for the charm quark. \nThe purpose of this talk is to p
resent our latest results and to discuss\nthe nature of the interaction in
the charmed 2-baryon system including \na possibility on the existence of
bound or resonance states.\n\nhttps://conference.ippp.dur.ac.uk/event/470
/contributions/2631/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2631/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tuning of hopping parameters in Oktay-Kronfeld action for heavy qu
arks on the $N_f=2+1+1$ MILC HISQ ensemble.
DTSTART;VALUE=DATE-TIME:20160726T180000Z
DTEND;VALUE=DATE-TIME:20160726T190000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2630@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Sungwoo Park (Seoul National University)\nWe determi
ne hopping parameters of the Oktay-Kronfeld (OK) action for charm and bott
om quarks. We use $N_f=2+1+1$ MILC HISQ ensembles (with $a\\approx0.12$fm\
, $am_l=0.0102$\, $am_s=0.0509$ and $am_c=0.635$). As a key ingredient\, w
e compute the masses of pseudoscalar and vector mesons $B_s^{\\ast}$\, $D_
s^{\\ast}$ and their hyperfine splittings\; the valence light quark is sim
ulated with HISQ action. We also monitor the inconsistency parameters to c
onfirm the improvement.\n\nhttps://conference.ippp.dur.ac.uk/event/470/con
tributions/2630/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2630/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Electromagnetic Form Factors through Parity-Expanded Variational A
nalysis
DTSTART;VALUE=DATE-TIME:20160729T144000Z
DTEND;VALUE=DATE-TIME:20160729T150000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2629@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Finn M. Stokes (University of Adelaide)\nVariational
analysis techniques in lattice QCD are powerful tools that give access to
the full spectrum of QCD. At zero momentum\, these techniques are well es
tablished and can cleanly isolate energy eigenstates of either positive or
negative parity.\n\nIn order to compute the form factors of a single ener
gy eigenstate\, we must perform a variational analysis at nonzero momentum
. When we do this with baryons\, we run into issues with parity mixing\, a
s boosted baryons are not eigenstates of parity. I present the parity-expa
nded variational analysis (PEVA) technique\, a novel method for ensuring t
he successful and consistent isolation of boosted baryons. This is achieve
d through a parity expansion of the operator basis used to construct the c
orrelation matrix.\n\nNucleon form factor calculations using this new tech
nique are presented\, showing the improvement over conventional methods.\n
\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2629/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2629/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Relaxation time of the fermions in the magnetic field (II)
- away from strong magnetic field limit -
DTSTART;VALUE=DATE-TIME:20160726T180000Z
DTEND;VALUE=DATE-TIME:20160726T190000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2628@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Tetsuya Onogi (Osaka University)\nThe relaxation tim
e for the fermions in the magnetic field is needed for estimate the chiral
magnetic effect. However\, it has been estimated only in the strong magne
tic field. We discuss the relaxation time away from the strong magnetic fi
eld limit.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/26
28/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2628/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-Perturbative Renormalization of Nucleon Charges with Automated
Perturbative Subtraction
DTSTART;VALUE=DATE-TIME:20160727T084000Z
DTEND;VALUE=DATE-TIME:20160727T090000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2627@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Georg von Hippel (University of Mainz)\nWe report on
the determination of the renormalization factors of quark bilinears which
are required among others in order to determine the nucleon scalar and te
nsor charges from the CLS $N_f=2$ configurations. Working in the RI'-MOM s
cheme\, we eliminate all lattice artifacts at one-loop order using a combi
nation of analytical results near the continuum limit and numerical calcul
ations in automated lattice perturbation theory. The latter will allow for
a ready generalization to the renormalization factors required for the av
erage momentum fraction and other operators beyond local bilinears.\n\nhtt
ps://conference.ippp.dur.ac.uk/event/470/contributions/2627/
LOCATION:Highfield Campus\, Universit of Southampton Building 67 Room 1027
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2627/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Volume reduction through perturbative Wilson loops
DTSTART;VALUE=DATE-TIME:20160727T103000Z
DTEND;VALUE=DATE-TIME:20160727T105000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2626@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Margarita Garcia-Perez (Instituto de Fisica Teorica
UAM-CSIC)\nWe derive the perturbative expansion of Wilson loops to order g
^4 in a SU(N) lattice gauge theory with twisted boundary conditions. Our e
xpressions show that the thermodynamic limit is attained at infinite N for
any number of lattice sites and allow to quantify the deviations from vol
ume independence at finite large N as a function of the twist. The effect
of adjoint Wilson fermions will be briefly described.\n\nhttps://conferenc
e.ippp.dur.ac.uk/event/470/contributions/2626/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2626/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon Vector and Axial-Vector Form Factors
DTSTART;VALUE=DATE-TIME:20160728T140000Z
DTEND;VALUE=DATE-TIME:20160728T142000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2625@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Yong-Chull Jang (Los Alamos National Laboratory)\nWe
present the status of the calculation of the nucleon iso-vector axial and
vector form factor using the MILC $N_f=2+1+1$ HISQ ensembles with lattice
spacings $a=0.12\, 0.09$\, and $0.06\\\;\\mathrm{fm}$ and three values of
light quark masses corresponding to pion masses $310\, 220\, 130\\\;\\mat
hrm{MeV}$. Valence quarks are simulated with the clover action. A number o
f techniques to increase the statistics cost effectively\, such as the AMA
(all-mode-averaging) method\, will be discussed.\n\nhttps://conference.ip
pp.dur.ac.uk/event/470/contributions/2625/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2625/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Introduction to the Quantum EXpressions (QEX) framework
DTSTART;VALUE=DATE-TIME:20160728T130000Z
DTEND;VALUE=DATE-TIME:20160728T132000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2624@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: James Osborn (ANL)\nWe present a new lattice field t
heory software framework designed with\nease of use\, flexibility\, effici
ency and portability in mind. The\nframework is written using the Nim pro
gramming language which offers\nmany of the features one would find in a h
igh-level scripting\nlanguage\, while in fact being a strongly-typed langu
age with full\ncontrol over low-level optimizations. This allows us to pr
esent a\nsimple expression-based language to the end user that can be\ntra
nsformed into highly optimized code for a particular architecture.\nWe wil
l discuss the features of the QEX framework\, performance results\nand dev
elopment plans.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributio
ns/2624/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2624/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Further Study of BRST-Symmetry Breaking on the Lattice
DTSTART;VALUE=DATE-TIME:20160726T180000Z
DTEND;VALUE=DATE-TIME:20160726T190000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2623@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Attilio Cucchieri (University of São Paulo)\nWe eva
luate the so-called Bose-ghost propagator in minimal Landau gauge\, \nfor
the SU(2) case in four dimensions. We consider lattice volumes up to \n$12
0^4$ and physical lattice extents up to 13.5 fm. We investigate\ndiscretiz
ation effects\, as well as the infinite-volume and continuum \nlimits. A n
onzero value for this quantity provides direct evidence of \nBRST-symmetry
breaking\, related to the restriction of the functional \nmeasure to the
first Gribov region.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contri
butions/2623/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2623/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Landau gauge gluon vertices from Lattice QCD
DTSTART;VALUE=DATE-TIME:20160729T171000Z
DTEND;VALUE=DATE-TIME:20160729T173000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2622@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Paulo Silva (Center for Physics\, University of Coim
bra)\nIn lattice QCD the computation of one-particle irreducible (1PI) Gre
en's functions with a large number (> 2) of legs is a challenging task. Be
sides tuning the lattice spacing and volume to reduce finite size effects\
, the problems associated with the estimation of higher order moments via
Monte Carlo methods and the extraction of 1PI from complete Green's functi
ons are limitations of the method. Herein\, we address these problems revi
siting the calculation of the three gluon 1PI Green's function\, with emph
asis in the infrared region and providing a first look at the four gluon v
ertex.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2622/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2622/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Constructing Nucleon Operators on a Lattice for Form Factors with
High Momentum Transfer
DTSTART;VALUE=DATE-TIME:20160725T145500Z
DTEND;VALUE=DATE-TIME:20160725T151500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2620@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Sergey Syritsyn (Jefferson Lab)\nIn typical nucleon
structure calculations on a lattice\, the interpolating fields are optimiz
ed to overlap with the nucleon ground state at rest\, which in practice li
mits the momentum transfer in form factors to $Q^2\\le 1\\\,GeV^2$. There
is great interest in studying nucleon form factors up to few tens of GeV^2
. New experiments at the JLab 12-GeV upgrade will measure nucleon form fac
tors with momentum transfers up to $18\\\,GeV^2$ in an attempt to reach th
e regime of perturbative QCD scaling and investigate further the pattern i
n the GE/GM ratio in the proton. With current lattice QCD techniques\, one
can achieve momenta of several $GeV^2$ without risk of overwhelming discr
etization effects. In a boosted nucleon\, however\, excited state admixtur
es will become even more problematic to control than at rest\, and will re
quire computing nucleon correlators to high statistical precision. I will
present some initial results from a lattice study of nucleon structure opt
imized for boosted nucleon initial and final states with the method recent
ly adopted by the Regensburg collaboration. These methods will also be ess
ential for the recently proposed novel method to compute parton distributi
ons directly on a lattice.\n\nhttps://conference.ippp.dur.ac.uk/event/470/
contributions/2620/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2620/
END:VEVENT
BEGIN:VEVENT
SUMMARY:MILC Staggered Conjugate Gradient Performance on Intel KNL
DTSTART;VALUE=DATE-TIME:20160728T144000Z
DTEND;VALUE=DATE-TIME:20160728T150000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2619@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Ruizi Li (Indiana University)\nWe review our work do
ne to optimize the staggered conjugate gradient(CG) algorithm in the MILC
code for use with the Intel Knights Landing (KNL) architecture. KNL is the
second generation Intel Xeon Phi processor. It is capable of massive thr
ead parallelism\, data parallelism and high on-board memory bandwidth\, an
d is being adopted in supercomputing centers for scientific research. The
CG solver consumes the majority of time in production running\, so we have
spent most of our effort on it. We compare performance of an MPI+OpenMP b
aseline version of the MILC code with a version incorporating the QPhiX st
aggered CG solver\, for both one-node and multi-node runs.\n\nhttps://conf
erence.ippp.dur.ac.uk/event/470/contributions/2619/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2619/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Matching issue in quasi parton distribution approach
DTSTART;VALUE=DATE-TIME:20160726T163000Z
DTEND;VALUE=DATE-TIME:20160726T165000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2618@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Tomomi Ishikawa (RIKEN BNL Research Center)\nIn rece
nt years\, the quasi parton distribution has been introduced to extract th
e parton distribution functions by the lattice QCD simulation. The quasi a
nd standard distribution share the same collinear IR singularity and the q
uasi distribution can be factorized into the standard distribution with pe
rturbative matching factor. The quasi parton distribution is known to have
power-law UV divergences\, which is quite different from the standard dis
tribution. We discuss the UV renormalization scheme in the matching. We al
so show an example of perturbative matching of the quasi quark distributio
n between continuum and lattice.\n\nhttps://conference.ippp.dur.ac.uk/even
t/470/contributions/2618/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2618/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A local update algorithm for supersymmetric Yang-Mills quantum mec
hanics
DTSTART;VALUE=DATE-TIME:20160726T180000Z
DTEND;VALUE=DATE-TIME:20160726T190000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2617@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Urs Wenger (AEC University of Bern)\nWe present a lo
cal update algorithm for gauge theories with dynamical fermions which allo
ws simulations in fixed canonical sectors. As a first application we perfo
rm canonical simulations in N=4 supersymmetric Yang-Mills quantum mechanic
s without a sign problem. Compared to previous studies\, we obtain results
with significantly better accuracy. We also discuss some aspects of the p
hysics of this theory\, including the appearance of flat directions in the
bosonic potential and of phase transitions related to those.\n\nhttps://c
onference.ippp.dur.ac.uk/event/470/contributions/2617/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2617/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Spectrum and mass anomalous dimension of SU(2) gauge theories with
fermions in the adjoint representation: from $N_f=1/2$ to $N_f=2$
DTSTART;VALUE=DATE-TIME:20160725T143500Z
DTEND;VALUE=DATE-TIME:20160725T145500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2616@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Georg Bergner (AEC ITP University of Bern)\nIn this
work I will summarize our results concerning the spectrum and\nmass anomal
ous dimension of SU(2) gauge theories with a different number\nof fermions
in the adjoint representation\, where each Majorana fermion\ncorresponds
effectively to half a Dirac flavour $N_f$. The most relevant\nexamples for
the extensions of the standard model are supersymmetric\nYang-Mills theor
y ($N_f=1/2$) and minimal walking technicolour ($N_f=2$). In\naddition to
these theories I will also consider the cases of $N_f=1$ and\n$N_f=3/2$.\n
The results will contain the particle spectrum of glueballs\, triplet and\
nsinglet mesons\, and possible fractionally charged spin half particles.\n
In addition I will discuss our recent results for the mass anomalous\ndime
nsion.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2616/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2616/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Two-flavor simulations of the rho(770) and the role of the KKbar c
hannel
DTSTART;VALUE=DATE-TIME:20160726T132000Z
DTEND;VALUE=DATE-TIME:20160726T134000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2615@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Bin Hu (Department of Physics\, The George Washingto
n University)\nThe $\\rho (770)$ meson is the most extensively studied res
onance in lattice QCD\nsimulations in two ($N_f=2$) and three ($N_f=2+1$)
flavors. We\nanalyze all available phase shifts from $N_f=2$ simulations u
sing unitarized Chiral Perturbation\nTheory\, allowing not only for the ex
trapolation in mass but also in flavor\,\n$N_f=2\\rightarrow N_f=3$. The f
lavor extrapolation requires information from a global\nfit to $\\pi\\pi$
and $\\pi K$ phase shifts from experiment. The $K\\bar K$ channel\nhas a s
ignificant effect and leads to $\\rho(770)$ masses surprisingly close to t
he\nexperimental one. Chiral extrapolations of $N_f=2+1$ simulations are a
lso presented.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contribution
s/2615/
LOCATION:Highfield Campus\, University of Southampton Bulding B2a Room 206
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2615/
END:VEVENT
BEGIN:VEVENT
SUMMARY:An application of stochastic LapH method to Hadron interaction in
lattice QCD
DTSTART;VALUE=DATE-TIME:20160728T171000Z
DTEND;VALUE=DATE-TIME:20160728T173000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2614@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Daisuke KAWAI (Kyoto University)\nThe first principl
e calculation of hadron-hadron interaction is an important step toward the
understanding of nuclear physics from QCD. The HAL QCD method is largely
contributing to this purpose by making it possible to calculate nuclear po
tentials in lattice QCD. We now try to extend the HAL QCD method to system
s such as $\\pi-\\pi$ and $\\pi-N$\, where pair creation and annihilation
of quarks become possible\, employing the stochastic LapH smearing. In t
his talk\, we explain our methodology and report the current status on the
application to two meson interactions.\n\nhttps://conference.ippp.dur.ac.
uk/event/470/contributions/2614/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2614/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon electromagnetic and axial form factors with N$_\\textrm{f}
=2$ twisted mass fermions at the physical point
DTSTART;VALUE=DATE-TIME:20160728T161000Z
DTEND;VALUE=DATE-TIME:20160728T163000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2613@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Giannis Koutsou (The Cyprus Institute)\nThe nucleon
electromagentic and axial form factors are presented using an N$_\\textrm{
f}$=2 twisted mass fermion ensemble with pion mass of 135 MeV. Dipole mass
es for the momentum dependence of the form factors are extracted and compa
red to experiment\, as is the nucleon magnetic moment and charge and magne
tic radii.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/26
13/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2613/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon spin and quark content at the physical point
DTSTART;VALUE=DATE-TIME:20160725T141500Z
DTEND;VALUE=DATE-TIME:20160725T143500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2612@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Constantia Alexandrou (University of Cyprus and The
Cyprus Institute)\nThe quark contributions to the spin and mass of the nuc
leon are computed using $N_f=2$ twisted mass fermions with a physical val
ue of the pion mass. We use improved methods to obtain accurate results fo
r \nthe disconnected contributions involved in the evaluation of the axial
charge and quark momentum fraction as well as the light\, the strange and
the charm $\\sigma$-terms.\n\nhttps://conference.ippp.dur.ac.uk/event/470
/contributions/2612/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2612/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The QCD deconfinement critical point as a function of N_t with N_f
=2 flavours of unimproved Wilson fermions
DTSTART;VALUE=DATE-TIME:20160725T154500Z
DTEND;VALUE=DATE-TIME:20160725T160500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2611@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Christopher Czaban (Goethe University Frankfurt am M
ain)\nQCD at zero baryon density in the limit of infinite quark mass under
goes a first order deconfinement phase transition at a critical temperatur
e T_c corresponding to the breaking of the global centre symmetry.\nIn the
presence of dynamical quarks the global centre symmetry is explicitly bro
ken. Lowering the quark mass the first order phase transition weakens and
terminates in a second order Z(2) point. Beyond this line confined and dec
onfined regions are analytically connected by a crossover transition. \nAs
the continuum limit is approached (i.e. the lattice spacing is decreased)
the region of first order transitions expands towards lower masses. We st
udy the deconfinement critical point with standard Wilson fermions and N_f
=2 flavours. Therefore we simulate several kappa values on N_t=8 and vario
us aspect ratios in order to extrapolate to the thermodynamic limit\, appl
ying finite size scaling. We estimate if and when a continuuum extrapolati
on is possible.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributio
ns/2611/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2611/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Determination of latent heat at the finite temperature phase trans
ition of SU(3) gauge theory
DTSTART;VALUE=DATE-TIME:20160729T155000Z
DTEND;VALUE=DATE-TIME:20160729T161000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2610@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Shinji Ejiri (Niigata University)\nWe calculate the
energy gap (latent heat) and pressure gap between \nthe hot and cold phase
s of the SU(3) gauge theory at the first \norder deconfining phase transit
ion point. \nWe perform simulations around the phase transition point with
\nthe lattice size in the temporal direction Nt=6\, 8 and 12 and \nextrap
olate the results to the continuum limit. \nThe energy density and pressur
e are evaluated by the derivative \nmethod with non-perturabative anisotro
py coefficients and by a \nmethod using the Yang-Mills gradient flow. \nWe
find that the pressure gap vanishes at all values of Nt when \nthe deriva
tive method is used. \nThe spatial volume dependence in the latent heat is
found to be \nsmall on large lattices. \nPerforming extrapolation to the
continuum limit\, we obtain \n$\\Delta \\epsilon/T^4 = 0.75 \\pm 0.17$ \na
nd \n$\\Delta (\\epsilon -3 p)/T^4 = 0.623 \\pm 0.056.$\n\nhttps://confere
nce.ippp.dur.ac.uk/event/470/contributions/2610/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2610/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Effects of magnetic fields on quark-antiquark interactions
DTSTART;VALUE=DATE-TIME:20160729T140000Z
DTEND;VALUE=DATE-TIME:20160729T142000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2609@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Andrea Rucci (University of Pisa and INFN Pisa)\nI w
ill discuss some recent results obtained in the study of the strong quark-
antiquark\ninteraction in the presence of intense external magnetic fields
. At zero temperature\nthe external field induces anisotropies in the stat
ic quark potential\, that affect both\nthe spectrum and the decays of the
heavy mesons. In the quark-gluon plasma phase\nthe screening masses do not
show significant anisotropies but display a non-trivial\ndependence on th
e magnetic field.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contribut
ions/2609/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2609/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Roberge-Weiss endpoint in $N_f=2+1$ QCD at the physical point
DTSTART;VALUE=DATE-TIME:20160725T170500Z
DTEND;VALUE=DATE-TIME:20160725T172500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2608@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Michele Mesiti (University of Pisa and INFN - Sezion
e di Pisa)\nIn this talk I will report on our recent results about the
\ndetermination of the position and the nature
of the Roberge-Weiss \nendpoint. Our study is per
formed in $N_f=2+1$ QCD\, with physical quark \nmasses\
, making use of stout-improved staggered fermions and of the
\ntree level Symanzik improvement for the gauge action. We study
the \ntheory at 4 different lattice spacings\, cor
responding to $N_t=4\,6\,8$ \nand $10$\, and at diffe
rent spatial sizes. The finite size scaling analysis\nperformed on $N_t=4$
and $6$ lattices indicates that the Roberge-Weiss\ntransition at the endp
oint is of the 2nd order kind\, in the 3D Ising\nuniversality class\, whil
e the continuum limit of the critical\ntemperature is found to be $T_{RW}=
208(5)$ MeV.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/
2608/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2608/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$|V_{cb}|$ from $\\bar{B}^0\\rightarrow D^{*+} \\ell^- \\bar{\\nu}
$ zero-recoil form factor using 2$+$1$+$1 flavour HISQ and NRQCD
DTSTART;VALUE=DATE-TIME:20160727T082000Z
DTEND;VALUE=DATE-TIME:20160727T084000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2607@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Judd Harrison (Department of applied mathematics and
theoretical physics\, University of Cambridge)\nWe present our recent cal
culation of the zero-recoil form factor for the semileptonic decay $\\bar{
B}^0\\rightarrow D^{*+} \\ell^- \\bar{\\nu} $ using lattice QCD with 2+1+
1 flavours of highly improved staggered quarks in the sea (the MILC HISQ c
onfigurations) and using non-relativistic QCD for the bottom quark. We obt
ain $\\mathcal{F}(1)$ and combine this with the latest HFAG average of $\\
eta_{EW} \\mathcal{F}(1) |V_{cb}|$ to get a value for $|V_{cb}|$.\n\nhttps
://conference.ippp.dur.ac.uk/event/470/contributions/2607/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2607/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Relative weights approach to dynamical fermions at finite densitie
s
DTSTART;VALUE=DATE-TIME:20160728T171000Z
DTEND;VALUE=DATE-TIME:20160728T173000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2606@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Jeffrey Greensite (San Francisco State University)\n
The relative weights method is applied to extract the effective Polyakov l
ine action corresponding to SU(3) gauge theory with dynamical staggered fe
rmions\, and this theory is solved\, at finite chemical potential and a fe
w sample temperatures\, quark masses\, and couplings\, by a mean field tec
hnique. The effective Polyakov line action is highly non-local\, and in a
t least one case we encounter very long-lived metastable states in the num
erical simulation.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contribu
tions/2606/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2606/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards Partial Compositeness on the Lattice: Baryons with Fermion
s in Multiple Representations
DTSTART;VALUE=DATE-TIME:20160728T163000Z
DTEND;VALUE=DATE-TIME:20160728T165000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2605@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: William Jay (University of Colorado Boulder)\nWe des
cribe our recent lattice study of SU(4) gauge theory with dynamical\nWilso
n-clover fermions in the fundamental and sextet representations. In\nthis
theory\, a unique type of baryon consists of quarks in both\nrepresentatio
ns. The spectrum of these "chimera baryons" turns out to have\nenlightenin
g interpretations in terms of large-N expansion and the\nnon-relativistic
quark model. We also discuss the relevance of these\nresults for so-called
"partially composite" models of physics beyond the\nStandard Model.\n\nht
tps://conference.ippp.dur.ac.uk/event/470/contributions/2605/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2605/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Masses and decay constants of D *(s) and B *(s) mesons in Lattice
QCD with Nf=2+1+1 Twisted fermions
DTSTART;VALUE=DATE-TIME:20160729T140000Z
DTEND;VALUE=DATE-TIME:20160729T142000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2604@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Aurora Melis (RomaTre University)\nWe present the re
sults of a Lattice QCD determination of the heavy-light vector mesons mass
es and decay constants. The vector decay constants are relevant hadronic p
arameters that\, for instance\, can provide phenomenologically good descri
ptions of non-leptonic decay rates within the factorization approximation.
\nOur calculation is based on the gauge configurations generated by the E
uropean Twisted Mass Collaboration with Nf = 2+1+1 dynamical quarks. These
are particularly suitable for charm physics\, as the strange and charm qu
ark masses are close to their physical values. The extension to the beauty
-sector requires an extrapolation for which the ETMC ratio method has been
applied.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/260
4/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2604/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Searching for evidence of diquark states using lattice QCD simulat
ions
DTSTART;VALUE=DATE-TIME:20160725T145500Z
DTEND;VALUE=DATE-TIME:20160725T151500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2603@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Ryutaro Fukuda (University of Tokyo\, RIKEN BNL Rese
arch Center)\nIn recent years\, exotic hadrons called X\, Y\, Z\nwhich can
not be explained by the quark model have been found one after another.\nFo
r example\, the tetraquark state\, which is one of the typical scenarios t
o interpret the exotic state\, is based on the existence of a diquark stat
e.\nThe discovery of a pentaquark state at CERN in July last year\nalso ma
kes a diquark state even more important.\nIt is well known that an attract
ion between two quarks\ncan be enhanced in the color anti-triplet\, flavor
anti-symmetric\,\nspin singlet\, positive parity channel and this diquark
is called good diquark.\nOur main subject is to check\nif a lattice QCD s
imulation with 2 flavor Wilson fermions actually supports this statement.\
nFor this objective\,\nwe calculate diquark mass diference between good di
quark and other diquarks\nand also analyze density distribution of diquark
s\nthrough calculation of density-density correlators.\n\nhttps://conferen
ce.ippp.dur.ac.uk/event/470/contributions/2603/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2603/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Properties of non-local wave function equivalent potential with ge
neralized derivative expansion
DTSTART;VALUE=DATE-TIME:20160728T163000Z
DTEND;VALUE=DATE-TIME:20160728T165000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2601@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Takuya Sugiura (RCNP\, Osaka University)\nHAL QCD co
llaboration has mostly considered the lowest order potential\nof the deriv
ative expansion so far based on the assumption that higher\norder terms yi
eld minor correction in low energy region.\nIn this study\, we aim at inve
stigating the properties of HAL QCD's non-local\npotentials when the deriv
ative expansion is explicitly performed to higher order.\nWe report the re
sult of our model calculation in a 1+1 dimensional coupled-channel\nsystem
. \nWe introduce a generalized version of the derivative expansion and sho
w\nthat the potential reproduces scattering phase shift quite well.\nThe g
eneralized expansion has some favorable features which is also applicable\
nto the actual lattice QCD calculations.\nThe possibility of improving the
convergence of the expansion is\nalso discussed in this framework.\n\nhtt
ps://conference.ippp.dur.ac.uk/event/470/contributions/2601/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2601/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Nf=3 gradient flow coupling running from 4GeV to 200MeV
DTSTART;VALUE=DATE-TIME:20160725T160500Z
DTEND;VALUE=DATE-TIME:20160725T162500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2600@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Alberto Ramos (CERN)\nA fundamental step in the ALPH
A collaboration efforts to\ndetermine the fundamental parameters of $N_f=3
$ QCD at the electroweak\nscale in terms of hadronic quantities is the con
nection of an\nintermediate scale $\\sim 4{\\rm GeV}$ with a hadronic scal
e. In this talk we will\nshow that using the Gradient Flow running couplin
g this task can be\nachieved with a very high precision. Our analysis will
pay special\nattention to the continuum limit of flow quantities and reac
h a\nprecision below 2% in the scale factor for a change of the coupling\n
from $g^2=13$ to $g^2=2.5$.\n\nhttps://conference.ippp.dur.ac.uk/event/470
/contributions/2600/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2600/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Viscosity of the pure SU(3) gauge theory revisited
DTSTART;VALUE=DATE-TIME:20160729T171000Z
DTEND;VALUE=DATE-TIME:20160729T173000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2599@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Attila Pasztor (University of Wuppertal\, for the Wu
ppertal-Budapest collaboration)\nWe give a preliminary estimate of the she
ar viscosity and the sound attenuation length in a pure SU(3) gluon plasma
\, using an improved anisotropic gauge action. We use Wilson-flow for anis
otropy tuning\, shifted boundary conditions for renormalization\, and a mu
ltilevel algorithm\nfor the measurement of the energy-momentum tensor corr
elators. We also look at the continuum limit of the momenta of the spectra
l function by using $N_t=10\,12\,16$ lattices.\n\nhttps://conference.ippp.
dur.ac.uk/event/470/contributions/2599/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2599/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Isovector Axial Charge with Current Improvement
DTSTART;VALUE=DATE-TIME:20160726T190000Z
DTEND;VALUE=DATE-TIME:20160726T200000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2598@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: YIBO Yang (university of Kentucky)\nWe employ dimens
ion 4 operators to improve the local vector and axial vector currents\, as
the leading order approximation of the lattice conserved current\, and th
en calculate the nucleon iso-vector axial coupling $g^3_A$ using overlap v
alence on Domain Wall Fermion sea. Using the equality of $g^3_A$ from $A_i
$ and $A_4$ components of the axial-vector current as a normalization cond
ition in addition to \naxial Ward identity\, we find two to three percent
increase of $g^3_A$ towards the experimental value. The excited state cont
amination has been taken into account with three time separations between
the source and sink.\nThe improved axial charges $g_A^{IM}(24I)=1.188(7)$\
, $g_A^{IM}(32I)=1.177(9)$ are obtained on $24^3\\times 64$ and $32^3\\tim
es 64$ lattices at the unitary point where the pion masses are $330$ MeV a
nd $300$ MeV respectively.\n\nhttps://conference.ippp.dur.ac.uk/event/470/
contributions/2598/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2598/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Renormalization constants of the lattice energy momentum tensor us
ing the gradient flow
DTSTART;VALUE=DATE-TIME:20160727T082000Z
DTEND;VALUE=DATE-TIME:20160727T084000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2597@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Francesco Capponi (Plymouth University)\nWe present
an update about our program for the non perturbative renormalization of th
e energy momentum tensor. Our strategy consists in probing suitable lattic
e Ward identities with observables computed along the gradient flow. This
set of identities exhibits many interesting qualities\, arising from the U
V finiteness of flowed composite operators\, and can be used to measure th
e renormalization constants of the energy momentum tensor. We show how thi
s method is applied in a SU(3) Yang-Mills theory on the lattice\, and repo
rt our numerical results.\n\nhttps://conference.ippp.dur.ac.uk/event/470/c
ontributions/2597/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2597/
END:VEVENT
BEGIN:VEVENT
SUMMARY:O(3) model with Nienhuis action
DTSTART;VALUE=DATE-TIME:20160726T142000Z
DTEND;VALUE=DATE-TIME:20160726T144000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2596@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Ulli Wolff (HU Berlin)\nWe study the O(3) sigma mode
l on a D=2 lattice with a Boltzmann weight linearized in $\\beta$ on each
link. \nWhile the spin formulation now suffers from a sign-problem the equ
ivalent loop model remains positive and \nbecomes particularly simple. By
studying the transfer matrix and by performing MC simulations in the loop
form \nwe study the mass gap coupling in a step scaling analysis. The ques
tion addressed is\, whether or not such a \nsimplified action still has th
e right universal continuum limit. If the answer is affirmative this would
be \nhelpful in widening the applicability of worm algorithm methods.\n\n
https://conference.ippp.dur.ac.uk/event/470/contributions/2596/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2596/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Numerical simulation of Dirac semimetals
DTSTART;VALUE=DATE-TIME:20160727T092000Z
DTEND;VALUE=DATE-TIME:20160727T094000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2595@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Andrey Kotov (ITEP)\nDirac semimetals are recently d
iscovered materials with low energy\nspectrum similar to the massless two
flavour 3+1D Dirac fermions. The interaction\nbetween quasiparticles in Di
rac semimetals is instantaneous Coulomb\nwith large effective coupling con
stant \\alpha\\sim 1. In this report we present the\nresult of study of th
e phase diagram of Dirac semimetals within lattice \nsimulation with roote
d staggered fermions. In particular\, calculate the chiral\ncondensate as
a function of effective coupling constants and thus determine\nthe positio
n of semimetal-insulator transition in Dirac semimetals.\n\nhttps://confer
ence.ippp.dur.ac.uk/event/470/contributions/2595/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2595/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon Matrix Elements at Physical Point and Cost Comparison
DTSTART;VALUE=DATE-TIME:20160725T164500Z
DTEND;VALUE=DATE-TIME:20160725T170500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2594@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Keh-Fei Liu (University of Kentucky)\nI shall report
on calculations of isovector matrix elements of the nucleon\, such as $g_
A\, g_s$\, and $\\langle x \\rangle$ on the $48^3 \\times 96$ lattice with
pion mass at 139 MeV and lattice size of 5.5 fm. We employ overlap valenc
e fermion on the 2+1 flavor DWF configurations for the calculation. Also r
eported will be the strange quark momentum fraction and its magnetic momen
t from this lattice. \n\n A comparison of the cost of such calculatio
ns with those of the twisted mass fermion\, clover fermion\, and domain wa
ll fermion on similar lattices and quark masses will be made for the calcu
lation of the nucleon mass and the three-point functions of both the conne
cted and disconnected insertions.\n\nhttps://conference.ippp.dur.ac.uk/eve
nt/470/contributions/2594/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2594/
END:VEVENT
BEGIN:VEVENT
SUMMARY:First Experiences with Overlap Fermions based on the Brillouin Ker
nel
DTSTART;VALUE=DATE-TIME:20160725T131500Z
DTEND;VALUE=DATE-TIME:20160725T133500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2593@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Stephan Durr (University of Wuppertal)\nFirst experi
ences are reported with overlap fermions which employ the Brillouin action
as a kernel. After discussing the dispersion relations of both the kernel
and the resulting chiral action\, some of the physics features are addres
sed on quenched backgrounds. We find that the overlap with Brillouin kerne
l is much better localized than the overlap with Wilson kernel. Also a pre
liminary account is given of the cost of the formulation\, in terms of CPU
time and storage.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contribu
tions/2593/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2593/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Accelerating Lattice QCD Multigrid on GPUs Using Fine-grained Para
llelization
DTSTART;VALUE=DATE-TIME:20160728T134000Z
DTEND;VALUE=DATE-TIME:20160728T140000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2592@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Kate Clark (NVIDIA)\nThe past decade has witnessed a
dramatic acceleration of lattice quantum chromodynamics calculations in n
uclear and particle physics. This has been due to both significant progres
s in accelerating the iterative linear solvers using multi-grid algorithms
\, and due to the throughput improvements brought by GPUs. Deploying hiera
rchical algorithms optimally on GPUs is non-trivial owing to the lack of p
arallelism on the coarse grids\, and as such\, these advances have not pro
ved multiplicative. Using the QUDA library\, we demonstrate that by exposi
ng all sources of parallelism that the underlying stencil problem possesse
s\, and through appropriate mapping of this parallelism to the GPU archit
ecture\, we can achieve high efficiency even for the coarsest of grids. Re
sults are presented for the Wilson-clover discretization\, where we demons
trate up to 10x speedup over present state-of-the-art GPU-accelerated meth
ods on Titan. Finally\, we consider how the combination of multigrid\, NV
IDIA's new Pascal architecture and block Krylov solvers result in a multip
licative speedup of 100x versus prior GPU state of the art.\n\nhttps://con
ference.ippp.dur.ac.uk/event/470/contributions/2592/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2592/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Angular and chiral content of the $\\rho$ and $\\rho^\\prime$ meso
ns
DTSTART;VALUE=DATE-TIME:20160726T140000Z
DTEND;VALUE=DATE-TIME:20160726T142000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2591@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Christian Rohrhofer (University of Graz)\nWe identif
y the chiral and angular momentum content of the \nleading quark-antiquark
Fock component for the $\\rho(770)$ and\n$\\rho(1450)$ mesons using a two
-flavor lattice simulation with dynamical\nOverlap Dirac fermions. We extr
act this information from the overlap factors \nof two interpolating fiel
ds with different chiral structure and from the unitary transformation\nb
etween chiral and angular momentum basis. For the chiral content of the me
sons\nwe find that\nthe $\\rho(770)$ slightly favors the $(1\,0)\\oplus(0\
,1)$ chiral representation\nand the $\\rho(1450)$ slightly favors the $(1/
2\,1/2)_b$ chiral\nrepresentation. In the angular momentum basis the $\\rh
o(770)$ is then a $^3S_1$\nstate\, in accordance with the quark model. The
$\\rho(1450)$ is a $^3D_1$ state\, \nshowing that the quark model wrongly
assumes the $\\rho(1450)$ to be a \nradial excitation of the $\\rho(770)$
.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2591/
LOCATION:Highfield Campus\, University of Southampton Bulding B2a Room 206
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2591/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Complex Langevin Dynamics In 1+1d QCD At Non-Zero Densities
DTSTART;VALUE=DATE-TIME:20160726T190000Z
DTEND;VALUE=DATE-TIME:20160726T200000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2590@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Sebastian Schmalzbauer (Goethe-Universität Frankfur
t\, Universität Regensburg)\nWe present our results obtained from gauge c
ooled complex Langevin simulations in 1+1D QCD at non-zero densities in th
e strong coupling regime with unrooted staggered fermions. For small quark
masses there are regions of the chemical potential where this method fail
s to reproduce correct results. In theses parameter ranges we studied the
effect of different gauge cooling schemes on the distributions of the ferm
ion determinant as well as of observables.\n\nhttps://conference.ippp.dur.
ac.uk/event/470/contributions/2590/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2590/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Interacting ultraviolet completions of four-dimensional gauge theo
ries
DTSTART;VALUE=DATE-TIME:20160725T170500Z
DTEND;VALUE=DATE-TIME:20160725T172500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2589@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Andrew Bond (University of Sussex)\nWe will discuss
some of the recent developments in understanding ultraviolet completions o
f gauge-Yukawa theories beyond traditional asymptotic freedom.\n\nhttps://
conference.ippp.dur.ac.uk/event/470/contributions/2589/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2589/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Near-conformal composite Higgs or PNGB with partial compositeness?
DTSTART;VALUE=DATE-TIME:20160725T141500Z
DTEND;VALUE=DATE-TIME:20160725T143500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2588@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Julius Kuti (U.C. San Diego)\nBased on recent analys
is of the LatHC collaboration I will review critical features of a minimal
composite Higgs model close to the conformal window. Challenging problems
of the near-conformal paradigm will be compared with PNGB based partial c
ompositeness.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions
/2588/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2588/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Complete Monopole Dominance of the Static Quark Potential
DTSTART;VALUE=DATE-TIME:20160729T155000Z
DTEND;VALUE=DATE-TIME:20160729T161000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2587@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Nigel David Cundy (Seoul National University)\nIn ea
rlier work\, we used a gauge independent Abelian Decomposition to show tha
t Abelian degrees of freedom where wholly responsible for the static quar
k postential. The Abelian decomposition contains a Maxwell part and Topolo
gical part\, whose contribution to the string tension can be analysed theo
retically and numerically\, and arises because of the existence of a certa
in type of monopole. If we also fix the gauge in a certain way\, we show t
hat the Topological part can wholly account for the string tension. We sho
w using numerical simulations in SU(2) Yang-Mills theory that the monopole
s which can at least partially explain confinement are present in the QCD
vacuum.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2587/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2587/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Computing the density of states with the global Hybrid Monte Carlo
DTSTART;VALUE=DATE-TIME:20160726T163000Z
DTEND;VALUE=DATE-TIME:20160726T165000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2586@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Roberto Pellegrini (The University of Edinburgh)\nTh
e LLR algorithm is a recent proposal for computing the density of states i
n lattice gauge theory. This algorithm has been tested in several bosonic
models at zero and finite chemical potential with impressive results. Its
original formulation is based on the simulation of the theory on restricte
d action intervals using local Monte Carlo updates.I will discuss a new ve
rsion of the method based on the global Hybrid Monte Carlo algorithm which
is suitable for theories with dynamical fermions. I will present our prel
iminary result for the study of the SU(2) gauge theory.\n\nhttps://confere
nce.ippp.dur.ac.uk/event/470/contributions/2586/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2586/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Monte Carlo simulation of $\\phi^4_2$ and $O(N)\\\,\\phi^4_3$ theo
ries
DTSTART;VALUE=DATE-TIME:20160726T153000Z
DTEND;VALUE=DATE-TIME:20160726T155000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2461@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Barbara De Palma (Istituto Nazionale di Fisica Nucle
are (INFN) and Università di Pavia)\nWe report lattice simulations of $\\
phi^4_2$ and $O(N)\\\,\\phi^4$ models\, performed by means a Monte Carlo m
ethod based on the all-order strong coupling expansion (worm algorithm). T
he investigation of the non–perturbative features of the $\\phi^4$ conti
nuum limit in two dimensions lead us to the result $g/\\mu^2 = 11.15 \\pm
0.06_{stat} \\pm 0.03_{syst}$ for the critical coupling. Furthermore we pr
esent a study of the scaling behaviour of worm and loop size in two-dimens
ional $O(N)$ model (non-linear $\\sigma$-model) and three-dimensional $\\p
hi^4\\\,O(N)$ model.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contri
butions/2461/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2461/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Light Isosinglet Scalar in Eight Flavor QCD
DTSTART;VALUE=DATE-TIME:20160726T132000Z
DTEND;VALUE=DATE-TIME:20160726T134000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2460@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: George Fleming (Yale University)\nThe LSD Collaborat
ion has recently completed a study of the light hadron spectrum in SU(3) g
auge theory with eight light\, degenerate flavors. We have observed that
the lightest isosinglet scalar meson\, also called the sigma\, remains ess
entially degenerate with the pions even when the (pi\,sigma) multiplet mas
s scale falls below half the rho meson mass as a function of the input qua
rk mass. This is clearly quite different from QCD with two light flavors.
However\, we also observe behavior consistent with the vector meson domi
nance (VMD) hypothesis\, which is quite similar to QCD with two light flav
ors. Finally\, we discuss how the presence of a light sigma in the spectr
um affects the standard methodology of lattice gauge theory calculations.\
n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2460/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2460/
END:VEVENT
BEGIN:VEVENT
SUMMARY:BSM Kaon mixing at the Physical Point
DTSTART;VALUE=DATE-TIME:20160726T190000Z
DTEND;VALUE=DATE-TIME:20160726T200000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2459@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Julia Kettle (University of Edinburgh)\nI present pr
eliminary results for Kaon Mixing Beyond the Standard Model at the physica
l point.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2459
/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2459/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Supergravity from Gauge Theory
DTSTART;VALUE=DATE-TIME:20160729T165000Z
DTEND;VALUE=DATE-TIME:20160729T171000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2457@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Evan Berkowitz (LLNL)\nGauge/gravity duality is the
conjecture that string theories have dual descriptions as gauge theories.\
nWeakly-coupled gravity is dual to strongly-coupled gauge theories\, ideal
for lattice calculations.\nI will show precision lattice calculations tha
t confirm large-N continuum D0-brane quantum mechanics correctly reproduce
s the leading-order supergravity prediction for a black hole's internal en
ergy---the first leading-order test of the duality---and constrains string
y and quantum corrections.\n\nhttps://conference.ippp.dur.ac.uk/event/470/
contributions/2457/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2457/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Using Wilson flow to study the deconfinement transition
DTSTART;VALUE=DATE-TIME:20160729T163000Z
DTEND;VALUE=DATE-TIME:20160729T165000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2456@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Saumen Datta (Tata Institute of Fundamental Research
)\nWe use the Wilson flow to study the deconfinement transition. We constr
uct \nrenormalized observables sensitive to the deconfinement transition.
In \nparticular\, behavior of renormalized operators associated with the P
olyakov \nloop are investigated for both quenched and two-flavor QCD. We a
lso \ninvestigate the behavior of various thermodynamic quantities across
the transition.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributio
ns/2456/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2456/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Progress on the lattice QCD calculation of the rare kaon decays: K
+ -> pi+ nu nu-bar
DTSTART;VALUE=DATE-TIME:20160728T161000Z
DTEND;VALUE=DATE-TIME:20160728T163000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2455@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Norman Christ (Columbia University)\nThe rare kaon d
ecays K+ -> pi+ nu nu-bar are highly suppressed in the standard model and
thus provide an ideal place to search for new physics beyond the standard
model. These decays are the principal objective of a new experiment\, NA62
at CERN. Another new experiment to search for KL -> pi0 nu nu-bar is now
underway at J-PARC. Given the goal of 10% precision by NA62\, it is import
ant to determine the long-distance contributions to the K+ -> pi+ nu nu-ba
r amplitude with a controlled uncertainty. In this talk I will report the
progress on the lattice QCD calculation of the long-distance contributions
to the K+ -> pi+ nu nu-bar decay amplitude\, with an emphasis on the trea
tment of the short-distance divergence in the bilocal operator system.\n\n
https://conference.ippp.dur.ac.uk/event/470/contributions/2455/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2455/
END:VEVENT
BEGIN:VEVENT
SUMMARY:D meson semileptonic form factors with HISQ valence and sea quarks
DTSTART;VALUE=DATE-TIME:20160729T142000Z
DTEND;VALUE=DATE-TIME:20160729T144000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2454@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Steven Gottlieb (Indiana University)\nWe present a c
alculation of the form factors of the $D\\to K l \\nu$ and $D\\to\\pi l \\
nu$ semileptonic decays at zero momentum transfer\, ultimately for the pur
pose of determining the CKM matrix elements $|{V_{cs}}|$ and $|{V_{cd}}|$.
This work uses MILC $N_f=2+1+1$ configurations with the HISQ action for
both sea quarks and valence quarks\, including several physical mass ensem
bles and lattice spacings down to $0.042 fm$. The calculation is done dir
ectly at $q^2=0$ by employing twisted boundary conditions to tune the chil
d particle momenta. Preliminary results at the physical point and in the
continuum limit are achieved through the use of Heavy-Meson Staggered $\\c
hi$PT.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2454/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2454/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Renormalisation of the scalar energy-momentum tensor with the Wils
on flow
DTSTART;VALUE=DATE-TIME:20160727T080000Z
DTEND;VALUE=DATE-TIME:20160727T082000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2453@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Susanne Ehret (University of Edinburgh)\nThe Wilson
flow is a promising tool to study strongly coupled theories. Its remarkabl
e renormalisation properties allow for a meaningful formulation of the ene
rgy-momentum tensor on the lattice. The non-perturbative computation of th
e latter can in turn be used to study the scaling behaviour of quantum fie
ld theories. We extent recent studies on the renormalisation of the energy
-momentum tensor in 4-dimensional gauge theory to the case of a 3-dimensio
nal scalar theory to investigate its intrinsic structure and numerical fea
sibility on a more basic level. In this talk\, we introduce the Wilson flo
w for scalar theory\, discuss Ward identities\, and present our results fo
r the renormalisation constants of the scalar energy-momentum tensor.\n\nh
ttps://conference.ippp.dur.ac.uk/event/470/contributions/2453/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2453/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Stochastic reconstruction of charmonium spectral functions at fini
te temperature
DTSTART;VALUE=DATE-TIME:20160728T140000Z
DTEND;VALUE=DATE-TIME:20160728T142000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2452@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Hiroshi Ohno (University of Tsukuba)\nWe study charm
onium spectral functions at finite temperature by using stochastic reconst
ruction methods. Our quenched lattice QCD simulations are performed with t
he standard plaquette gauge and the $O(a)$-improved Wilson fermion actions
on 192$^3 \\times N_\\tau$ lattices with $N_\\tau$ = 96--32\, which corre
sponds to temperatures from 0.73$T_c$ to 2.2$T_c$. To reconstruct the char
monium spectral functions for the Euclidean time correlators we apply two
different stochastic methods called Stochastic Analytical Inference (SAI)
and Stochastic Optimization Method (SOM)\, where the former is based on th
e Bayes' theorem similar to commonly used Maximum Entropy Method (MEM) whi
le the latter does not rely on any prior information. We carefully estimat
e systematic uncertainties by comparing results among SAI\, SOM and also M
EM. With the given spectral functions we discuss melting temperatures of c
harmonia as well as the heavy quark diffusion coefficient.\n\nhttps://conf
erence.ippp.dur.ac.uk/event/470/contributions/2452/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2452/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Nucleon Axial Form Factor from HISQ
DTSTART;VALUE=DATE-TIME:20160728T171000Z
DTEND;VALUE=DATE-TIME:20160728T173000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2451@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Aaron Meyer (University of Chicago/Fermilab)\nThe nu
cleon axial form factor is a dominant contribution to errors in neutrino o
scillation studies. Lattice calculations have the potential to make an im
pact on controlling theory errors by disentangling the effects of nuclear
corrections and nucleon form factors. In this talk\, I will present preli
minary results on a blinded calculation of $g_A$ and the axial form factor
using HISQ staggered baryons with 2+1+1 flavors of sea quarks. Calculati
ons are done using physical light quark masses and are absolutely renormal
ized. Results are fit using the model-independent z-expansion parameteriz
ation and systematic errors are quantified.\n\nhttps://conference.ippp.dur
.ac.uk/event/470/contributions/2451/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2451/
END:VEVENT
BEGIN:VEVENT
SUMMARY:D-Meson Mixing in 2+1 Lattice QCD and Related Topics
DTSTART;VALUE=DATE-TIME:20160729T144000Z
DTEND;VALUE=DATE-TIME:20160729T150000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2450@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Andreas Kronfeld (Fermilab)\nWe present results for
neutral $D$-meson mixing in 2+1-flavor lattice QCD.\nWe compute the matrix
elements for all five operators that contribute to $D$ mixing at short di
stances\, including those that only arise beyond the Standard Model.\nWe p
resent a detailed error breakdown for all sources of statistical and syste
matic uncertainty and the corresponding set of correlations among the matr
ix elements.\nOur results have an uncertainty similar to those of the ETM
Collaboration (with 2 and with 2+1+1 flavors).\nThis work shares many feat
ures with a recent publication on $B$ mixing and with ongoing work on heav
y-light decay constants from the Fermilab Lattice and MILC Collaborations\
, both of which will be briefly summarized.\n\nhttps://conference.ippp.dur
.ac.uk/event/470/contributions/2450/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2450/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hadron Matrix Elements and the Feynman-Hellman Theorem
DTSTART;VALUE=DATE-TIME:20160725T154500Z
DTEND;VALUE=DATE-TIME:20160725T160500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2449@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Andre Walker-Loud (LBNL)\nMotivated by the Feynman-H
ellman Theorem\, we develop an improved method for computing matrix elemen
ts of external currents utilizing only two-point correlation functions.\nT
he contamination from excited states is shown to be Euclidean-time depende
nt allowing for a significantly improved ability to reliably determine and
control the systematics.\nWe demonstrate the utility of our method with a
calculation of the nucleon axial-charge\, performed at a single lattice s
pacing and a moderate unphysical pion mass.\nThe Feynman-Hellman Theorem c
an be derived from the long Euclidean-time limit of correlation functions
determined with functional derivatives of the partition function.\nThis el
ucidates the generic applicability of our new method: one can determine ma
trix elements of any external current by computing only two-point correlat
ion functions\, including non-zero momentum transfer and flavor-changing m
atrix elements.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributio
ns/2449/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2449/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Phenomenology of Heavy Ions and LQCD
DTSTART;VALUE=DATE-TIME:20160729T101500Z
DTEND;VALUE=DATE-TIME:20160729T110000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2448@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Aleksi Kurkela (CERN and Univ. Stavanger)\nPhenomeno
logy of Heavy Ions and LQCD\n\nhttps://conference.ippp.dur.ac.uk/event/470
/contributions/2448/
LOCATION:University of Southampton\, Highfield Campus Building 32 (EEE) Ro
om 1015 and Building 67 (Nightingale) Room 1027 via video link
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2448/
END:VEVENT
BEGIN:VEVENT
SUMMARY:From Spin Models to Lattice QCD – the Scientific Legacy of Peter
Hasenfratz
DTSTART;VALUE=DATE-TIME:20160725T081500Z
DTEND;VALUE=DATE-TIME:20160725T084500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2447@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Urs Wenger (University of Bern)\nFrom Spin Models to
Lattice QCD – the Scientific Legacy of Peter Hasenfratz\n\nhttps://conf
erence.ippp.dur.ac.uk/event/470/contributions/2447/
LOCATION:Highfield Campus\, University of Southampton Building 32 (EEE) Ro
om 1015 and Building 67 (Nightingale) Room 1027 via video link
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2447/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QED Corrections to Hadronic Observables
DTSTART;VALUE=DATE-TIME:20160728T101500Z
DTEND;VALUE=DATE-TIME:20160728T110000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2446@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Agostino Patella (CERN and Plymouth U.)\nWhen aiming
at a percent precision in hadronic quantities calculated by means of latt
ice simulations\, isospin breaking effects become relevant. These are of t
wo kinds: up/down mass splitting and electromagnetic corrections. In orde
r to properly account for the latter\, a consistent formulation of electri
cally-charged states in finite volume is needed. In fact on a periodic tor
us Gauss' law and large gauge transformations forbid the propagation of el
ectrically-charged states. In this talk I will review methods that have be
en used or proposed so far in order to circumvent this problem\, while hig
hlighting practical as well as conceptual pros and cons. I will also revie
w and discuss various methods to calculate electromagnetic corrections to
hadron masses and decay rates in numerical simulations.\n\nhttps://confere
nce.ippp.dur.ac.uk/event/470/contributions/2446/
LOCATION:University of Southampton\, Highfield Campus Building 32 (EEE) Ro
om 1015 and Building 67 (Nightingale) Room 1027 via video link
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2446/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nuclear Physics
DTSTART;VALUE=DATE-TIME:20160726T080000Z
DTEND;VALUE=DATE-TIME:20160726T084500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2445@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Martin Savage (Institute for Nuclear Theory)\nLattic
e QCD is making good progress toward calculating the structure and propert
ies of light nuclei and the forces between nucleons. These calculations wi
ll ultimately\nrefine the nuclear forces\, particularly in the three- and
four-nucleon sector and the\nshort-distance interactions of nucleons with
electroweak currents\, and allow for a reduction of uncertainties in nucle
ar many-body calculations of nuclei and their reactions. After highlightin
g their importance\, particularly to the Nuclear Physics and High-Energy P
hysics experimental programs\, I will discuss the progress that has been m
ade toward achieving these goals and the challenges that remain.\n\nhttps:
//conference.ippp.dur.ac.uk/event/470/contributions/2445/
LOCATION:Highfield Campus\, University of Southampton Building 32 (EEE) Ro
om 1015 and Building 67 (Nightingale) Room 1027 via video link
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2445/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Presentation of 2016 Kenneth Wilson Award
DTSTART;VALUE=DATE-TIME:20160728T110000Z
DTEND;VALUE=DATE-TIME:20160728T113000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2444@conference.ippp.dur.ac.uk
DESCRIPTION:https://conference.ippp.dur.ac.uk/event/470/contributions/2444
/
LOCATION:University of Southampton\, Highfield Campus Building 32 (EEE) Ro
om 1015 and Building 67 (Nightingale) Room 1027 via video link
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2444/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Closing Remarks
DTSTART;VALUE=DATE-TIME:20160730T113000Z
DTEND;VALUE=DATE-TIME:20160730T120000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2443@conference.ippp.dur.ac.uk
DESCRIPTION:https://conference.ippp.dur.ac.uk/event/470/contributions/2443
/
LOCATION:University of Southampton\, Highfield Campus Building 32 (EEE) Ro
om 1015 and Building 67 (Nightingale) Room 1027 via video link
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2443/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice QCD at nonzero temperature and density
DTSTART;VALUE=DATE-TIME:20160729T080000Z
DTEND;VALUE=DATE-TIME:20160729T084500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2442@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Heng-Tong Ding (Central China Normal University)\nI
will review some recent selected results from Lattice QCD computations at
nonzero temperature and density.\n\nhttps://conference.ippp.dur.ac.uk/even
t/470/contributions/2442/
LOCATION:University of Southampton\, Highfield Campus Building 32 (EEE) Ro
om 1015 and Building 67 (Nightingale) Room 1027 via video link
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2442/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thermalisation properties of various field theories
DTSTART;VALUE=DATE-TIME:20160729T171000Z
DTEND;VALUE=DATE-TIME:20160729T173000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2441@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Marietta Magdolna Homor (Eotvos Lorand University)\n
Motivated by the hadronization properties of heavy-ion and p-p collisions\
,\nwe study the thermalisation properties of field theories.\nFirst of all
\, we present our recent observations regarding the local energy-density\n
and momentum distributions in the classical Phi^4 theory.\nAs this theory
exhibits interesting features regarding these questions\,\nwe continue the
research by the MC simulation of the SU(3) Yang-Mills theory\nand we inte
nd to investigate further in more complicated theories.\n\nhttps://confere
nce.ippp.dur.ac.uk/event/470/contributions/2441/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2441/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Studying the Low Energy Effective Theory of Eight Flavor QCD
DTSTART;VALUE=DATE-TIME:20160726T134000Z
DTEND;VALUE=DATE-TIME:20160726T140000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2440@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Andrew Gasbarro (Yale University)\nIn recent years\,
lattice studies of multi-flavor gauge theories near and inside the confor
mal window have provided strong evidence for the existence of light 0++ st
ates in their spectra\, which has led to a renewed interest in strong dyna
mics as a solution to the Higgs hierarchy problem. An additional requirem
ent to realize a UV complete composite Higgs sector is that observables of
low energy scattering be in close agreement with the linear sigma model.
We will compute the momentum dependence of the scalar form factor of the
pion and of the scattering phase shift of I=2 pi-pi scattering. These qua
ntities will be compared to the linear sigma model and other low energy ef
fective theories. We will also study the vector form factor to test the a
nsatz of vector meson dominance and to compare to I=1 scattering in a futu
re study. This talk reports on the current progress.\n\nhttps://conferenc
e.ippp.dur.ac.uk/event/470/contributions/2440/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2440/
END:VEVENT
BEGIN:VEVENT
SUMMARY:long distance part of $\\epsilon_K$ from lattice QCD
DTSTART;VALUE=DATE-TIME:20160728T163000Z
DTEND;VALUE=DATE-TIME:20160728T165000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2439@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Ziyuan Bai (Columbia)\nWe demonstrate the lattice QC
D calculation of the long distance contribution\nto $\\epsilon_K$. Due to
the singular\, short-distance structure of\n$epsilon_K$\, we must perform
a short-distance subtraction and introduce a\ncorresponding subtraction te
rm determined from perturbation theory\, which\nwe calculate at Next Leadi
ng Order (NLO). We perform the calculation on a\n$24^3 \\times 64$ lattic
e with a pion mass of 329 MeV. This work is a\ncomplete calculation\, whi
ch includes all connected and disconnected\ndiagrams.\n\nhttps://conferenc
e.ippp.dur.ac.uk/event/470/contributions/2439/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2439/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Energy-momentum tensor on the lattice: recent developments
DTSTART;VALUE=DATE-TIME:20160729T110000Z
DTEND;VALUE=DATE-TIME:20160729T113000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2438@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Hiroshi Suzuki (Kyushu University)\nIt is conceivabl
e that the construction of the energy-momentum tensor in lattice field the
ory enlarges our ability in lattice field theory and also deepens our unde
rstanding on the energy-momentum tensor in the non-pertubative level. In t
his talk\, I will review recent developments in this enterprise.\n\nhttps:
//conference.ippp.dur.ac.uk/event/470/contributions/2438/
LOCATION:University of Southampton\, Highfield Campus Building 32 (EEE) Ro
om 1015 and Building 67 (Nightingale) Room 1027 via video link
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2438/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Dark Side of the Propagators: analytical approach to QCD in t
he infrared of Minkowski space.
DTSTART;VALUE=DATE-TIME:20160729T163000Z
DTEND;VALUE=DATE-TIME:20160729T165000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2437@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Fabio SIRINGO (Dipartimento di Fisica e Astronomia\,
Università di Catania)\nSince most of the non-perturbative approaches to
QCD rely on numerical calculations in the *Euclidean* space\, many import
ant dynamical information cannot be easily extracted because of the ill-de
fined problem of analytic continuation for a limited set of data points.\n
On the other hand\, by a shift of the expansion point\, a perturbative app
roach has been developed[1\,2] that has the nice feature of providing one-
loop analytical functions for the propagators that are in perfect agreemen
t with the data of lattice simulations in the Euclidean space. These funct
ions are generally analytic and can be studied in Minkowski space\, yieldi
ng a direct proof of positivity violation and confinement.\n\nThe expansio
n has been extended to full QCD [3]\, including a set of chiral quarks\, i
n order to give a unified description of dynamical mass generation and chi
ral symmetry breaking\, yielding new insights on the coupled quark\, gluon
and ghost propagators in the infrared of Minkowski space\, that is still
basically unexplored.\n\nWhile dealing with the exact Lagrangian\, the mod
ified expansion is based on *massive* free-particle propagators\, is safe
in the infrared and is equivalent to the standard perturbation theory in t
he UV [2\,3]. By dimensional regularization\, all diverging mass terms can
cel exactly without including spurious mass counterterms that would spoil
the gauge and chiral symmetry of the Lagrangian. If optimized\, the *mass
ive* expansion provides a variational tool disguised to look like a pertur
bative method\, without any phenomenological parameter\, from first princi
ples.\n\nAmong the main findings\, universal scaling properties are predic
ted for the inverse dressing functions and shown to be satisfied by the la
ttice data. Complex conjugated poles are found for the gluon propagator\,
in agreement with the *i-particle* scenario. No complex poles are found fo
r the quark propagators but the positivity constraints of the spectral fun
ctions are badly violated by the explicit presence of\nnegative-norm multi
particle states below the two-particle threshold.\n\n\n----------\n\n\n [1
] F. Siringo\, *Perturbative study of Yang-Mills theory in the infrared*\,
arXiv:1509.05891.\n\n [2] F. Siringo\, *Analytical study of Yang-Mills t
heory in the infrared from first principles*\, Nucl.Phys.B907\, 572 (2016)
\; arXiv:1511.01015.\n\n [3] F. Siringo\, *Analytic structure of QCD propa
gators in Minkowski space*\, arXiv:1605.07357\n\nhttps://conference.ippp.d
ur.ac.uk/event/470/contributions/2437/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2437/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards a theory of the QCD string
DTSTART;VALUE=DATE-TIME:20160725T111500Z
DTEND;VALUE=DATE-TIME:20160725T114500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2436@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Sergei Dubovsky (NYU)\nI will review recent advances
in describing the dynamics of the QCD string (confining flux tube) both o
n theoretical and on lattice sides. I will argue that combined efforts of
theorists and lattice practitioners may result in a dramatic progress in o
ur understanding of the world sheet theory of the QCD string in the neares
t future.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/243
6/
LOCATION:University of Southampton Building 32 (EEE) Room 1015 and Buildin
g 67 (Nightingale) Room 1027 via video link
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2436/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The physical spectrum of a partially Higgsed gauge theory
DTSTART;VALUE=DATE-TIME:20160728T142000Z
DTEND;VALUE=DATE-TIME:20160728T144000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2435@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Pascal Toerek (University of Graz)\nThe description
of electroweak physics using perturbation theory is highly successful. Tho
ugh not obvious\, this is due to a subtle field-theoretical effect\, the F
röhlich-Morchio-Strocchi mechanism\, which links the physical spectrum to
that of the elementary particles. This works because of the special stru
cture of the standard model\, and it is not a priori clear whether it work
s for structurally different theories. \nCandidates for conflicts are\, e.
g.\, partially Higgsed gauge theories. We study this situation in an $SU(3
)$ gauge theory with one fundamental Higgs field and a breaking pattern $S
U(3) \\rightarrow SU(2)$. We determine the leading order predictions for t
he gauge invariant spectrum in this theory and discuss the results from la
ttice simulations.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contribu
tions/2435/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2435/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Roberge-Weiss periodicity and confinement-deconfinement transition
DTSTART;VALUE=DATE-TIME:20160725T164500Z
DTEND;VALUE=DATE-TIME:20160725T170500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2434@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Kouji Kashiwa (Yukawa Institute for Theoretical Phys
ics\, Kyoto University)\nWe propose a new determination of the confinement
-deconfinement transition by using the imaginary chemical potential. The i
maginary chemical potential can be interpreted as the Aharonov-Bohm phase
and then an analogy of the topological-order suggests that the Roberge-Wei
ss endpoint would define the deconfinement temperature. Based on the topol
ogical property\, we can construct a new quantity which describes the conf
inement-deconfinement transition. This quantity is defined as the integral
of the quark number susceptibility along the closed loop of $\\theta$ whe
re $\\theta$ is the dimensionless imaginary chemical potential. Expected b
ehavior of it at finite temperature is discussed and its asymptotic behavi
ors are shown.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contribution
s/2434/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2434/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Complex Langevin for Lattice QCD at $T=0$ and $\\mu \\ge 0$.
DTSTART;VALUE=DATE-TIME:20160726T153000Z
DTEND;VALUE=DATE-TIME:20160726T155000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2433@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Donald SInclair (Argonne-Seville)\nWe simulate Latti
ce QCD with 2 light quark flavours at zero temperature and finite quark nu
mber chemical potential $\\mu$. Gauge cooling is applied\, along with adap
tive rescaling of the updating `time' increment\, to stabilize the algorit
hm. We see evidence for the expected transition at $\\mu \\approx m_N/3$ a
nd for saturation at large $\\mu$. Limitations of the method are discussed
.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2433/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2433/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Discussion of the Loop Formula for the fermionic determinant
DTSTART;VALUE=DATE-TIME:20160726T190000Z
DTEND;VALUE=DATE-TIME:20160726T200000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2432@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Ion-Olimpiu Stamatescu (I.T.P.\, University Heidelbe
rg)\nA formula expressing the fermionic determinant as an infinite \nprodu
ct of smaller determinants is here derived and discussed. \nThese smaller
determinants are of a fixed size\, independent of \nthe size of the lattic
e and are indexed by loops of increasing \nlength. The application of the
formula requires convergence \nconsiderations.\n\nhttps://conference.ippp.
dur.ac.uk/event/470/contributions/2432/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2432/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A gauge invariant Debye mass for the complex heavy-quark potential
DTSTART;VALUE=DATE-TIME:20160728T142000Z
DTEND;VALUE=DATE-TIME:20160728T144000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2431@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Alexander Rothkopf (Institute for Theoretical Physic
s\, Heidelberg University)\nThe concept of a screening mass is a powerful
tool to simplify the intricate physics of in-medium test charges surrounde
d by light charge carriers. While it has been successfully used to describ
e electromagnetic properties\, its definition and computation in QCD is pl
agued by questions of gauge invariance and the presence of non-perturbativ
e contributions from the magnetic sector.\n\nHere we present a recent alte
rnative definition [1] of a gauge invariant Debye mass parameter following
closely the original idea of Debye and Hueckel. Our test charges are a st
atic heavy quark-antiquark pair whose complex potential and its in-medium
modification can be extracted using lattice QCD [2]. By combining in a gen
eralized Gauss-Law the non-perturbative aspects of quark binding with a pe
rturbative ansatz for the medium effects\, we succeed to describe the latt
ice values of Re[V] and Im[V] [3] with a single temperature dependent para
meter\, in turn identified with a Debye mass. \n\nWe find that its behavio
r evaluated both in quenched QCD [4]\, as well as dynamical Nf=2+1 QCD [3]
deviates from that in other approaches\, such as hard-thermal-loop pertur
bation theory or from electric field correlators on the lattice. Around th
e phase transition e.g. its values tend to zero significantly faster than
at weak-coupling.\n\n[1] Y. Burnier\, A.R. Phys.Lett. B753 (2016) 232-236\
n[2] A.R.\, T. Hatsuda\, S. Sasaki\, Phys.Rev.Lett. 108 (2012) 162001\n[3]
Y.Burnier\, O. Kaczmarek\, A.R. Phys.Rev.Lett. 114 (2015) 082001\n[4] Y.B
urnier\, A.R. in preparation\n\nhttps://conference.ippp.dur.ac.uk/event/47
0/contributions/2431/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2431/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Looking forward to new lattice inputs for flavour phenomenology
DTSTART;VALUE=DATE-TIME:20160726T180000Z
DTEND;VALUE=DATE-TIME:20160726T190000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2430@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Matthew Kirk (IPPP\, Durham University)\nWe review t
he current status of HQE predictions for neutral meson mixing \nand relate
d observables. A comparison with most recent data shows a \nconfirmation o
f the HQE\, but also leaves sizeable space for new physics effects.\nWe al
so point out what improved lattice inputs might be most useful for\nunambi
guously identifying new physics in mixing observables.\n\nhttps://conferen
ce.ippp.dur.ac.uk/event/470/contributions/2430/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2430/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quark masses and strong coupling constant with Highly-Improved Sta
ggered Quarks
DTSTART;VALUE=DATE-TIME:20160726T130000Z
DTEND;VALUE=DATE-TIME:20160726T132000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2429@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Yu Maezawa (YITP\, Kyoto University)\nWe present new
results on the charm and bottom quark masses as well as the strong coupli
ng constant in 2+1-flavor QCD\nusing Highly Improved Staggered Quark actio
n and gauge configurations generated by HotQCD Collaboration.\nOur approac
h is based on calculating the moments of meson correlators and we use a
wide range of lattice spacing up to $a^{-1} \\sim 4.9$ GeV in our study.\n
The ratios of quark masses $m_c/m_s$ and $m_b/m_c$ are obtained from the c
ombinations of the pseudo-scalar and vector meson masses and found to be $
m_c/m_s=11.871(96)$ and $m_b/m_c=4.528(57)$ in the continuum limit.\nThe l
attice results of the hyper-fine splitting of the charmonium can reproduce
the experimental value in the continuum.\nWe also perform the determinati
on of the strong coupling constant in the $\\overline{\\rm MS}$ scheme fro
m the moments of pseudo-scalar charmonium correlators and find $\\alpha_s(
\\mu=m_c)=0.3697(56)$\, which is the determination of $\\alpha_s$\nat lowe
st energy scale so far.\nFor the charm quark mass we obtain $m_c(\\mu=m_c)
=1.2668(10)$ GeV.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contribut
ions/2429/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2429/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Calculation of Parton Distributions from Lattice QCD
DTSTART;VALUE=DATE-TIME:20160725T131500Z
DTEND;VALUE=DATE-TIME:20160725T133500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2428@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Christian Wiese (NIC - DESY Zeuthen)\nAlthough parto
n distribution functions are the fundamental objects describing the inner
structure of hadrons\, they were so far not calculated from first principl
es.\nIn the past\, lattice QCD has successfully been employed for the comp
utation of hadronic spectra and form factors. Yet calculations of quark di
stributions are still missing\, since they are given by light-cone correla
tion functions and light-like distances are not accessible on an Euclidean
lattice.\n \nThis could possibly be overcome by a recent proposal which a
llows the light-cone distributions to be extracted from purely spatial cor
relations\, being thus accessible to lattice methods. In order to test the
feasibility of this method\, we present the latest results of our effort
to perform a lattice calculation of the non-singlet combination for the mo
mentum\, helicity and transversity distributions of the nucleon using twis
ted mass fermions. \n\nWe will also give first results for the application
of a newly proposed momentum improved smearing\, which has the potential
to reach higher nucleon momenta as required for a save matching procedure
to the physical distribution functions.\n\nhttps://conference.ippp.dur.ac.
uk/event/470/contributions/2428/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2428/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Partially conserved axial vector current and applications
DTSTART;VALUE=DATE-TIME:20160726T165000Z
DTEND;VALUE=DATE-TIME:20160726T171000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2427@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Holger Perlt (Institute for Theoretical Physics\, Un
iversity of Leipzig)\nA partially conserved axial vector current that sati
sfies the chiral\nWard identity is defined nonperturbatively for improved
Wilson\nfermions. A first application to the nucleon axial vector coupling
is\npresented.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributio
ns/2427/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2427/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Baryon interactions from lattice QCD with physical masses -- Overv
iew and S = 0\, -4 sectors --
DTSTART;VALUE=DATE-TIME:20160729T130000Z
DTEND;VALUE=DATE-TIME:20160729T132000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2426@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Doi Takumi (RIKEN)\nThe lattice QCD determination of
baryon interactions corresponds to connecting a missing link between part
icle physics and nuclear and astrophysics. While previous studies are limi
ted to the calculations with unphysically heavy quark masses\, we are perf
orming the first calculation employing the (almost) physical quark masses
(m(pi) = 146 MeV) on a huge lattice volume of (8fm)^4\, where the interact
ions are extracted from Nambu-Bethe-Salpeter (NBS) correlators by the time
-dependent HAL QCD method. In this talk\, we first give an overview on thi
s project. We then present the latest numerical results for two-nucleon fo
rces (strangeness S = 0) and two-Xi forces (S = -4).\n\nhttps://conference
.ippp.dur.ac.uk/event/470/contributions/2426/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2426/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon structure from 2+1-flavor dynamical DWF ensembles
DTSTART;VALUE=DATE-TIME:20160725T162500Z
DTEND;VALUE=DATE-TIME:20160725T164500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2425@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Shigemi Ohta (KEK)\nNucleon isovector vector- and ax
ialvector-current form factors and some low moments of isovector structure
functions will be reported with improved statistics from four recent RBC+
UKQCD 2+1-flavor dynamical drain-wall fermions ensembles: Iwasaki gauge 24
^3x64 at 1.78-GeV momentum cut off and pion mass of 432 ans 330 MeV and Iw
asaki times DSDR gauge 32^3x64 at 1.38 GeV momentum cut off and pion mass
of 250 and 172 MeV.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contrib
utions/2425/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2425/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-perturbative determination of improvement coefficients using c
oordinate space correlators in Nf=2+1 lattice QCD
DTSTART;VALUE=DATE-TIME:20160727T090000Z
DTEND;VALUE=DATE-TIME:20160727T092000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2424@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Piotr Korcyl (University of Regensburg)\nWe determin
e quark mass dependent order a improvement terms of the form $b_J$ am for
non-singlet scalar\, pseudoscalar\, vector and axialvector currents\, usin
g correlators in coordinate space. We use a set of CLS ensembles comprisin
g non-perturbatively improved Wilson Fermions and the tree-level Luescher-
Weisz gauge action at $\\beta=3.4\, 3.46\, 3.55$ and $\\beta=3.7$\, corres
ponding to lattice spacings a in [0.05\,0.09] fm. We report the values of
the $b_J$ improvement coefficients which are proportional to non-singlet q
uark mass combinations and also discuss the possibility of determining the
$\\bar{b}_J$ coefficients which are proportional to the trace of the quar
k mass matrix.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contribution
s/2424/
LOCATION:Highfield Campus\, Universit of Southampton Building 67 Room 1027
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2424/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Simulating thimble regularization of lattice quantum field theorie
s (including LGT)
DTSTART;VALUE=DATE-TIME:20160727T090000Z
DTEND;VALUE=DATE-TIME:20160727T092000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2423@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Francesco Di Renzo (University of Parma &\; INFN)
\nMonte Carlo simulations of lattice quantum field theories on Lefschetz t
himbles are non trivial. We discuss a new Monte Carlo algorithm based on t
he idea of computing contributions to the functional integral which come f
rom complete flow lines. The latter are the steepest ascent paths attached
to critical points\, i.e. the basic building blocks of thimbles. The meas
ure to sample is thus dictated by the contribution of complete flow lines
to the partition function. The algorithm is based on a heat bath sampling
of the gaussian approximation of the thimble: this defines the proposals f
or a Metropolis-like accept/reject step. The effectiveness of the algorith
m has been tested on a few models\, e.g. the chiral random matrix model. W
e also discuss thimble regularization of gauge theories\, and in particula
r the successfull application to 0+1 dimensional QCD and the status and pr
ospects for Yang-Mills theories.\n\nhttps://conference.ippp.dur.ac.uk/even
t/470/contributions/2423/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2423/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Heavy-heavy current improvement for calculation of $\\bar{B}\\righ
tarrow D^{(*)}\\ell \\bar{\\nu}$ semi-leptonic form factors using the Okta
y-Kronfeld action -- 2
DTSTART;VALUE=DATE-TIME:20160726T190000Z
DTEND;VALUE=DATE-TIME:20160726T200000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2422@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Jaehoon Leem (Seoul National University)\nThe Oktay-
Kronfeld action is a highly improved version of the Fermilab action and sy
stematically reduces heavy quark discretization effects through $\\mathcal
{O}(\\lambda^3)$\nin HQET power counting\, for the heavy-light meson spect
rum. To calculate $\\bar{B}\\rightarrow D^{(*)}\\ell \\bar{\\nu}$ semi-lep
tonic form factors using Oktay-Kronfeld heavy quarks\, we need to improve
the heavy quark currents to the same level.\nWe report our progress in cal
culating the improvement coefficients\nfor currents composed of bottom and
charm quarks.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contribution
s/2422/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2422/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Heavy-heavy current improvement for calculation of $\\bar{B}\\righ
tarrow D^{(*)}\\ell \\bar{\\nu}$ semi-leptonic form factors using the Okta
y-Kronfeld action -- 1
DTSTART;VALUE=DATE-TIME:20160727T080000Z
DTEND;VALUE=DATE-TIME:20160727T082000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2421@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Jon Bailey (Seoul National University)\nThe Oktay-Kr
onfeld action is a highly improved version of the Fermilab action and\nsys
tematically reduces heavy quark discretization effects through $\\mathcal{
O}(\\lambda^3)$ in HQET power counting\, for the heavy-light meson spectru
m. To calculate $\\bar{B}\\rightarrow D^{(*)}\\ell \\bar{\\nu}$ semi-lepto
nic form factors using Oktay-Kronfeld heavy quarks\, we need to improve th
e heavy quark currents to the same level. We report our progress in calcul
ating the improvement coefficients for currents composed of bottom and cha
rm quarks.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/24
21/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2421/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Landau Levels in Lattice QCD
DTSTART;VALUE=DATE-TIME:20160729T165000Z
DTEND;VALUE=DATE-TIME:20160729T171000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2420@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Ferenc Pittler (Eötvös University)\nThe spectrum o
f the two-dimensional continuum Dirac operator in\nthe presence of a unifo
rm background magnetic field consists of Landau\nlevels\, which are degene
rate and separated by gaps. On the lattice the\nLandau levels are spread o
ut by discretization artefacts\, but a\nremnant of their structure is clea
rly visible (Hofstadter butterfly).\nIf one switches on a non-Abelian inte
raction\, the butterfly structure\nwill be smeared out\, but the lowest La
ndau level will still be\nseparated by a gap from the rest of the spectrum
. In this talk we\ndiscuss how the eigenmodes of the four-dimensional QCD
Dirac operator\nare built out of the two-dimensional eigenmodes of the Dir
ac operator\ndiagonalized on each slice at fixed (z\,t). In particular\, s
tarting\nfrom this decomposition\, we consider how well certain physical\n
quantities are approximated by using only the two-dimensional\neigenmodes
belonging to the lowest Landau level.\n\nhttps://conference.ippp.dur.ac.uk
/event/470/contributions/2420/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2420/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Two-colour QCD at finite density with two flavours of staggered qu
arks
DTSTART;VALUE=DATE-TIME:20160728T163000Z
DTEND;VALUE=DATE-TIME:20160728T165000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2419@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Lukas Holicki (Justus-Liebig-University Giessen)\nLa
ttice simulations of two-colour QCD can be performed at finite density wit
hout sign problem and by now have a long history already. The physics of t
he bosonic diquark baryons is believed to be fairly well understood and qu
alitatively resembles QCD at finite isospin density with pion condensation
. There is good guidance from effective field theory predictions and model
studies of the BEC-BCS crossover inside the condensed phase. We have revi
sited the question how well this can all be described with rooted staggere
d quarks. A potential problem thereby is the proximity of the bulk phase.
We therefore use an improved gauge action and lattice couplings that somew
hat larger than those of the early studies with N f =8 and 4 flavours.\nTh
is implies that we have to worry about additive renormalization in the chi
ral condensate before we can compare our results with the effective field
theory predictions. We also confirm that the Polyakov-loop does not appear
to respond to the finite density in the staggered formulation\, and we pe
rform some basic meson and diquark spectroscopy at finite density.\n\nhttp
s://conference.ippp.dur.ac.uk/event/470/contributions/2419/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2419/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kaon semileptonic decays with $N_f=2+1+1$ HISQ fermions and physic
al light quark masses
DTSTART;VALUE=DATE-TIME:20160728T132000Z
DTEND;VALUE=DATE-TIME:20160728T134000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2418@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Elvira Gamiz (University of Granada)\nWe present an
update of our calculation of the $K_{\\ell 3}$ form factor $f_+^{K \\pi}(
0)$\, with added statistics and the inclusion of new ensembles with smalle
r lattice spacing. In addition\, we now also include a study of finite vol
ume effects using a version of staggered ChPT that includes the effects of
twisted boundary conditions.We also examine the implications for the unit
arity of the CKM matrix in the first row by combining these improved resul
ts together with $N_f=2+1+1$ MILC results for light decay constants.\n\nht
tps://conference.ippp.dur.ac.uk/event/470/contributions/2418/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2418/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Perturbative running of the twisted Yang-Mills coupling in the gra
dient flow scheme
DTSTART;VALUE=DATE-TIME:20160726T190000Z
DTEND;VALUE=DATE-TIME:20160726T200000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2417@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Eduardo Ibanez Bribian (Instituto de Fisica Teorica
UAM-CSIC)\nWe present our ongoing computation of the running of the twiste
d Yang-Mills coupling using gradient flow techniques. In particular\, we u
se the gradient flow equation with twisted boundary conditions to perform
a perturbative expansion of the expectation value of the Yang-Mills energy
density up to fourth order at finite flow time\, and regularise the respe
ctive resulting sums and integrals. Additionally\, we show our ongoing com
putation of the aforementioned integrals in the particular case of a two-d
imensional twist.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contribut
ions/2417/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2417/
END:VEVENT
BEGIN:VEVENT
SUMMARY:RG scaling at chiral phase transition in two-flavor QCD
DTSTART;VALUE=DATE-TIME:20160726T180000Z
DTEND;VALUE=DATE-TIME:20160726T190000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2416@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Ken-ichi Ishikawa (Hiroshima University)\nWe investi
gate the nature of the chiral phase transition using the RG improved gauge
action and the Wilson quark action \nwith two degenerate quarks on $32^3\
\times 16$\, $24^3\\times 12$\, and $16^3\\times 8$ lattices.\n\nWe introd
uce RG scaling relations for both the time direction and the spacial effec
tive masses of mesons at the chiral phase transition point.\nNumerical res
ults of effective masses at the chiral phase transition on the three sizes
of lattices are excellently on the universal limiting curves for the pseu
do-scalar meson and vector meson\, respectively\, except for three data po
ints at short distance of each lattice.\nThe results imply the effective m
asses of pion and vector meson vanishes as $1/N$ in the continuum limit
with $N \\\, a=$ constant.\nThe fact that the scaling relations are satisf
ied and the effective masses becomes zero in the continuum limit strongly
implies the transition is of second order.\nWhen the quark is massive at t
he chiral phase transition in the deconfining side\, \n the hyper-scaling
is verified with $\\gamma^{*}\\simeq 0.5.$\n\nhttps://conference.ippp.dur.
ac.uk/event/470/contributions/2416/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2416/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The chiral phase transition from non-integer flavour numbers with
staggered fermions
DTSTART;VALUE=DATE-TIME:20160725T162500Z
DTEND;VALUE=DATE-TIME:20160725T164500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2415@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Francesca Cuteri (Goethe University - Frankfurt)\nTh
e attempt at clarifying the order of the thermal transition in the chiral
limit of QCD at zero chemical potential\, with two dynamical flavours of q
uarks\, by progressively decreasing the simulated pion mass has proven to
be inconclusive because of the increasing costs of the simulations as the
pion mass is lowered.\n\nAn alternative way to approach this question is t
o consider the path integral as a function of continuous Nf . If the tra
nsition is first order for Nf ≳ 3 \, a second order transition for Nf =
2 requires a tricritical point in between.\n\nThe simulation of non-integ
er numbers of fermion flavours is easily achievable within the staggered f
ermion discretization. First simulations at μ = 0 and Nf = 2.8\, 2.6\,
2.4\, 2.2 \, on coarse Nτ = 4 lattices\, show a continuous variation o
f the critical mass mapping out a critical line in the m − Nf plane.\n
\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2415/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2415/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Finite Size Scaling of the Higgs-Yukawa Model near the Gaussian Fi
xed Point
DTSTART;VALUE=DATE-TIME:20160725T172500Z
DTEND;VALUE=DATE-TIME:20160725T174500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2414@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: David Y.-J. Chu (Department of Electrophysics\, Nati
onal Chaio Tung University)\nWe study the scaling property of Higgs-Yukawa
models. Using the technique of Finite-Size Scaling\, we are able to deri
ve formulae to describe the behaviour of the observables near the Gaussian
fixed point. The renormalisation procedure is discussed in this talk. A
feasibility study of our strategy is performed for pure scalar theory. I
n addition\, we test the formulae with lattice data obtained in the weak-c
oupling regime for the Higgs-Yukawa model. These formulae can be used to
investigate the universality classes of the observed phase transitions\, a
nd thus play an essential role in further investigations of Higgs-Yukawa m
odels.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2414/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2414/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Density of States
DTSTART;VALUE=DATE-TIME:20160729T091500Z
DTEND;VALUE=DATE-TIME:20160729T094500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2413@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Kurt Langfeld (Plymouth University)\nAlthough Monte
Carlo calculations using Importance Sampling have matured into the most wi
dely employed method for determining first principle results in QCD\, they
spectacularly fail for theories with a sign problem or for which certain
rare configurations play an important role. Non-Markovian Random walks\, b
ased upon iterative refinements of the density-of-states\, overcome such o
verlap problems. In my talk\, I will review the Linear Logarithmic Relaxat
ion (LLR) method and\, in particular\, focus onto ergodicity and exponent
ial error suppression. Applications include the high-state Potts model\, U
(1)\, SU(2) and SU(3) Yang-Mills theories as well as quantum field theorie
s with a sign problem: the Z3 spin model and QCD at finite densities of he
avy quarks.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2
413/
LOCATION:University of Southampton\, Highfield Campus Building 32 (EEE) Ro
om 1015 and Building 67 (Nightingale) Room 1027 via video link
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2413/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Comparison of algorithms for solving the sign problem of the finit
e $\\mu$ O(3) model in 1+1 dimensions
DTSTART;VALUE=DATE-TIME:20160729T140000Z
DTEND;VALUE=DATE-TIME:20160729T142000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2412@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Csaba Torok (Eotvos University\, Budapest)\nWe study
the 1+1 dimensional nonlinear O(3) model at finite chemical potential usi
ng the complex Langevin algorithm and the worm algorithm. In the latter th
e sign problem is totally eliminated. We determine the range of parameters
\, where complex Langevin produces correct results and study whether takin
g the continuum limit allows the exploration of the full phase diagram of
the model.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/24
12/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2412/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Absence of bilinear condensate in three-dimensional QED
DTSTART;VALUE=DATE-TIME:20160727T080000Z
DTEND;VALUE=DATE-TIME:20160727T082000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2411@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Nikhil Karthik (Florida International University)\nT
here are plausibility arguments that QED in three dimensions has\na criti
cal number of flavors of massless two-component fermions\,\nbelow which sc
ale invariance is broken by the presence of bilinear\ncondensate. We pres
ent numerical evidences from our dynamical\nlattice simulations using over
lap as well as Wilson-Dirac fermions\nfor the absence of bilinear condensa
te using the following methods:\nfinite-size scaling analysis of the low-l
ying eigenvalues of the Dirac\noperator\, comparison of the eigenvalue dis
tributions to the non-chiral\nrandom matrix theory\, and by checking if th
e inverse participation\nratio and number variance show ergodic behavior.\
n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2411/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2411/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chiral transition\, eigenmode localisation and Anderson-like model
s
DTSTART;VALUE=DATE-TIME:20160729T140000Z
DTEND;VALUE=DATE-TIME:20160729T142000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2410@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Matteo Giordano (Eötvös University\, Budapest)\nI
discuss chiral symmetry restoration and eigenmode localisation in\nfinite-
temperature QCD by looking at the lattice Dirac operator as a\nrandom Hami
ltonian. I will argue that the features of QCD relevant to\nboth phenomena
are the presence of order in the Polyakov line\nconfiguration\, and the c
orrelations that this induces between spatial\nlinks across time slices. T
his ties the fate of chiral symmetry and of\nlocalisation of the lowest Di
rac eigenmodes to the confining\nproperties of the theory. I then show num
erical results obtained in a\nQCD-inspired Anderson-like toy model\, deriv
ed by radically simplifying\nthe QCD dynamics while keeping the important
features mentioned\nabove. The toy model reproduces all the important qual
itative aspects\nof chiral symmetry breaking and localisation in QCD\, thu
s supporting\nthe central role played by the confinement/deconfinement tra
nsition in\ntriggering both phenomena.\n\nhttps://conference.ippp.dur.ac.u
k/event/470/contributions/2410/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2410/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Charm Physics with Domain Wall fermions
DTSTART;VALUE=DATE-TIME:20160729T130000Z
DTEND;VALUE=DATE-TIME:20160729T132000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2409@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Justus Tobias Tsang (University of Southampton)\nThi
s talk will provide an overview of RBC/UKQCD's charm project on their 2+1
flavour physical point ensembles using Domain Wall Fermions for the light
as well as for the charm quarks. I will discuss the analysis strategy and
present the latest results for the $D$ and $D_s$ decay constants. I will a
lso outline the wider charm-related physics program of RBC/UKQCD.\n\nhttps
://conference.ippp.dur.ac.uk/event/470/contributions/2409/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2409/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The gradient flow coupling from numerical stochastic perturbation
theory
DTSTART;VALUE=DATE-TIME:20160727T084000Z
DTEND;VALUE=DATE-TIME:20160727T090000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2408@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Mattia Dalla Brida (DESY - Zeuthen)\nThe perturbativ
e calculation of gradient flow observables is technically challenging. \nC
urrent results are in fact limited to a few quantities and\, in general\,
to low perturbative orders. Numerical stochastic perturbation theory is a
potentially powerful tool that may be applied in this context. Precise res
ults using these techniques\, however\, require control over both statisti
cal and systematic uncertainties. In this talk we discuss how the recent a
lgorithmic developments of these methods substantially ameliorate the cost
for such precise computations. As an illustration we then present results
for the two-loop matching of the gradient flow coupling in finite volume
with Schroedinger functional boundary conditions and the $\\overline{\\rm
MS}$ coupling.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contribution
s/2408/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2408/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Strangeness at finite temperature
DTSTART;VALUE=DATE-TIME:20160725T135500Z
DTEND;VALUE=DATE-TIME:20160725T141500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2407@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Szabolcs Borsanyi (University of Wuppertal)\nWe give
a lattice-based description of QCD thermodynamics in the\nhadronic phase
from staggered simulations of up to $N_t=16$.\nUsing generalized quark num
ber susceptibilities\nwe obtain the free energy in various strangeness sec
tors and\ncompare it with the expectations from the hadron resonance gas\n
model. We use the findings to disambiguate between various\nspectrum table
s. Thus we constrain the abundance of strange\nmesons and baryons using fi
nite temperature data\n\nhttps://conference.ippp.dur.ac.uk/event/470/contr
ibutions/2407/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2407/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Charm quark diffusion coefficient from nonzero momentum Euclidean
correlator in temporal channel
DTSTART;VALUE=DATE-TIME:20160728T132000Z
DTEND;VALUE=DATE-TIME:20160728T134000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2406@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Atsuro Ikeda (Osaka University)\nWe study the charm
quark diffusion coefficient from nonzero momentum correlator in temporal c
hannel on the quenched lattice. Euclidean correlator in temporal channel w
ith zero momentum is constant as a function of the imaginary time because
of the charge conservation. However this quantity with finite momentum is
dependent on imaginary time and is more sensitive to the low energy struct
ure of the spectral function than those in the spatial channel. We make es
timates on the diffusion coefficient from this channel. We perform the num
erical simulation on the lattice and apply the discussion for 1.5 \n\nht
tps://conference.ippp.dur.ac.uk/event/470/contributions/2406/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2406/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Update on Nf=3 finite temperature QCD phase structure with Wilson-
Clover fermions
DTSTART;VALUE=DATE-TIME:20160726T180000Z
DTEND;VALUE=DATE-TIME:20160726T190000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2405@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Shinji Takeda (Kanazawa University)\nWe will present
an update on analysis of the phase structure for\nfinite temperature QCD
with 3-flavor non-perturbatively O(a) improved Wilson-Clover fermions and
Iwasaki gauge action.\nIn our previous study\, it was shown that the value
of kurtosis of quark condensate\nat the critical point tends to deviate f
rom that of 3D Z_2 universality class when\nincreasing the temporal lattic
e sizes N_T=8 and 10\,\nwhile the values at smaller N_T=4 and 6 are consis
tent with that of Z_2 .\nWe will discuss possible sources of this phenomen
on and present results of new analysis.\n\nhttps://conference.ippp.dur.ac.
uk/event/470/contributions/2405/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2405/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards radiative transitions in charmonium
DTSTART;VALUE=DATE-TIME:20160725T172500Z
DTEND;VALUE=DATE-TIME:20160725T174500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2404@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Cian O'Hara (Trinity College Dublin)\nWe present pre
liminary calculations towards radiative transitions in charmonium using Nf
= 2+1 dynamical ensembles generated by the Hadron Spectrum Collaboration.
A crucial ingredient in this work is the use of variationally optimised i
nterpolating operators which allow for a reliable determination of the thr
ee-point correlation functions needed. Using these operators\, we perform
first calculations of relevant three-point correlation functions before di
scussing future directions"\n\nhttps://conference.ippp.dur.ac.uk/event/470
/contributions/2404/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2404/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Simulation of SU(2) gauge theory with improved domain-wall fermion
s
DTSTART;VALUE=DATE-TIME:20160726T180000Z
DTEND;VALUE=DATE-TIME:20160726T190000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2403@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Hideo Matsufuru (High Energy Accelerator Research Or
ganization (KEK))\nIn this work\, we study SU(2) gauge theory with many fl
avors using\nthe improved domain-wall fermions\, which is realized by the
stout-HYP\nlink smearing and the optimal domain-wall formulation.\nIn cont
rast to the standard domain-wall fermions used in the previous\nstudies\,
it enables us to investigate the small fermion mass region due\nto the muc
h suppressed residual mass.\nWith the improved domain-wall fermions\, the
spectrum and the residual\nmass are examined on previously generated confi
gurations as well as\nin dynamical simulations.\nWe also discuss the exten
sion to simulations of the epsilon-regime.\n\nhttps://conference.ippp.dur.
ac.uk/event/470/contributions/2403/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2403/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tensor networks
DTSTART;VALUE=DATE-TIME:20160726T091500Z
DTEND;VALUE=DATE-TIME:20160726T094500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2402@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Shinji Takeda (Kanazawa University)\nIn this talk\,
I will review the recent progress of tensor network approaches\;\nHamilton
ian/Hilbert-space approach and Lagrangian/path-integral approach\,\nwhose
striking feature is free of the sign problem.\nAs examples\, I will show s
ome results of CP(N-1) model including theta-term and other models.\nFinal
ly\, I will address outstanding problems and discuss future prospects.\n\n
https://conference.ippp.dur.ac.uk/event/470/contributions/2402/
LOCATION:Highfield Campus\, University of Southampton Building 32 (EEE) Ro
om 1015 and Building 67 (Nightingale) Room 1027 via video link
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2402/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Determining $\\alpha_s$ by using the gradient flow in the quenched
theory
DTSTART;VALUE=DATE-TIME:20160725T164500Z
DTEND;VALUE=DATE-TIME:20160725T170500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2401@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Eliana Lambrou (University of Wuppertal)\nWe present
preliminary results to determine the strong coupling constant by using th
e gradient flow. Pure SU(3) gauge theory is studied. We carry out a direct
analysis on very fine zero temperature lattices. In addition we attempt t
o move towards the perturbative regime by using step-scaling.\n\nhttps://c
onference.ippp.dur.ac.uk/event/470/contributions/2401/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2401/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-Local effective SU(2) Polyakov loop model from inverse Monte-C
arlo methods
DTSTART;VALUE=DATE-TIME:20160728T165000Z
DTEND;VALUE=DATE-TIME:20160728T171000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2400@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Bardiya Bahrampour (Justus-Liebig University Giessen
)\nThe strong coupling expansion of the lattice gauge action leads to a Po
lyakov loop model that effectively describes the gluodynamic at low temper
atures and together with the hopping expansion of\nthe fermion determinant
allows for insights into the QCD phase diagram at finite density and low
temperatures\, although the accessible pion masses are rather large.\nAt h
igh temperatures the strong coupling expansion breaks down and it is expec
ted that the interaction of Polyakov loops becomes non-local.\nTherefore w
e use inverse Monte-Carlo methods to map pure SU(2) gluodynamic to differe
nt non-local Polyakov models . We take into account Polyakov loops in high
er representations and gradually add interaction terms at larger distances
to investigate how well we can describe the full theory. Particularly we
are interested in the behaviour of those models when extrapolating the de
pendency of non-local terms and higher represenations\, especially in the
large volume limit. We try to find connections between the strength of the
coupling of the non-local terms (with respect to the interaction distanc
e) and the correlation length of the full theory at a given value of the g
auge coupling in order to compare our results to existing proposals for no
n-local effective actions.\n\nhttps://conference.ippp.dur.ac.uk/event/470/
contributions/2400/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2400/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Flavor singlet mesons in QCD with varying number of flavors
DTSTART;VALUE=DATE-TIME:20160726T140000Z
DTEND;VALUE=DATE-TIME:20160726T142000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2399@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Yasumichi Aoki (KEK)\nFlavor singlet pseudoscalar an
d scalar mesons are importat objects for both SM-QCD and technicolor model
s. The study utilizes the handle of the number of flavors in the many-flav
or QCD simulations\, which has been performed by LatKMI collaboration. Thr
ough this\, implications to both SM-QCD and technicolor\, which could help
understand the dynamics of flavor singlet sector\, are anticipated. We re
port on the on-going study towatds this direction with high-statitics HISQ
configurations mainly with $N_f=8$ and $4$.\n\nhttps://conference.ippp.du
r.ac.uk/event/470/contributions/2399/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2399/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lambda-Nucleon and Sigma-Nucleon interactions from lattice QCD wit
h physical masses
DTSTART;VALUE=DATE-TIME:20160729T140000Z
DTEND;VALUE=DATE-TIME:20160729T142000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2398@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Hidekatsu Nemura (Center for Computational Sciences\
, University of Tsukuba)\nWe present our recent study on baryon-baryon (BB
) interactions from\n lattice QCD with almost physical quark masses corres
ponding to\n $(m_\\pi\,m_K)\\approx(146\,525)$ MeV and large volume\n $(La
)^4=(96a)^4\\approx$ (8.2 fm)$^4$. In order to make better use of\n large
scale computer resources\, a large number of BB interactions from\n NN to
$\\Xi\\Xi$ are calculated simultaneously. In this contribution\,\n we focu
s on the strangeness $S=-1$ channels[1] of the hyperon\n interactions by m
eans of HAL QCD method. More recent results will be\n presented which incl
ude $\\Lambda$N$-\\Sigma$N coupled-channel potential\n comprising the tens
or force as well as increasing the Monte Carlo\n samples than shown in the
past[1].\n\n References: \n [1] H. Nemura\, et al.\, arXiv:1604.08346 [h
ep-lat].\n[enter link description here][1]\n\n\n [1]: https://arxiv.org/a
bs/1604.08346\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions
/2398/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2398/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sea quark QED effects and twisted mass fermions
DTSTART;VALUE=DATE-TIME:20160726T163000Z
DTEND;VALUE=DATE-TIME:20160726T165000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2397@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Roberto Frezzotti (University of Rome Tor Vergata\,
Physics Department and INFN - Sezione di Roma Tor Vergata)\nWe show that m
aximally twisted mass fermions can be employed to regularize on the lattic
e\nthe fully unquenched QCD+QED theory with vanishing theta-term. We discu
ss how the critical\nmass of the up and down quarks can be conveniently de
termined beyond the electroquenched\napproximation by imposing that certai
n symmetries of continuum QCD+QED\, which are broken by\nWilson terms\, ar
e restored (up to cutoff effects). A mixed action setup is sketched that a
llows to extend the computation of the leading isospin breaking correction
s to physical observables via the RM123 method beyond the electroquenched
approximation by using ETMC (pure QCD) gauge configurations with N_f=2+1+1
dynamical quark flavours\, with only O(a^2) lattice artifacts.\n\nhttps:/
/conference.ippp.dur.ac.uk/event/470/contributions/2397/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2397/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Light and strange axial form factors of the nucleon at pion mass 3
17 MeV
DTSTART;VALUE=DATE-TIME:20160728T144000Z
DTEND;VALUE=DATE-TIME:20160728T150000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2396@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Jeremy Green (Institut für Kernphysik\, Johannes Gu
tenberg-Universität Mainz)\nA lattice QCD calculation of the light and st
range axial form factors $G_A$ and $G_P$ of the nucleon will be reported.
Disconnected diagrams were calculated using hierarchical probing\, and a c
lear nonzero signal was obtained. We pay special attention to renormalizat
ion\, which we determined nonperturbatively\, including the mixing between
light and strange quarks. This calculation was done on a single ensemble
with 2+1 flavours of stout-smeared Wilson-clover fermions at pion mass 317
MeV and near-physical strange quark mass.\n\nhttps://conference.ippp.dur.
ac.uk/event/470/contributions/2396/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2396/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The CP(2) Model at Nonzero Chemical Potential
DTSTART;VALUE=DATE-TIME:20160729T132000Z
DTEND;VALUE=DATE-TIME:20160729T134000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2395@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Wynne Evans (University of Bern)\nCP(N-1) quantum fi
eld theories in (1+1)-d share important features with (3+1)-d QCD\, such a
s asymptotic freedom\, a dynamically generated mass gap and topological se
ctors. In the low energy limit the (2+1)-d SU(3) spin system undergoes spo
ntaneous symmetry breaking and hence dimensional reduction to the (1+1)-d
CP(2) model. By performing Monte Carlo simulations of (2+1)-d SU(3) spin s
ystems at non-zero chemical potential we have gained access to the (1+1)-d
CP(2) model at non-zero chemical potential. The theory which underpins ou
r calculation will be reviewed and numerical results for the magnetisation
s and correlation functions as a function of the chemical potentials will
be discussed.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions
/2395/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2395/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Meson masses and decay constants at large N
DTSTART;VALUE=DATE-TIME:20160727T105000Z
DTEND;VALUE=DATE-TIME:20160727T111000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2394@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Masanori Okawa (Hiroshima University)\nMeson masses
and decay constants in the large N limit of SU(N) gauge theory is estimate
d from the twisted space-time reduced model. To this end\, we introduce a
new smearing method which enables us to obtain reliable values for these
quantities.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2
394/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2394/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Functional Fit Approach (FFA) for Density of States method: SU(3)
spin system and SU(3) gauge theory with static quarks
DTSTART;VALUE=DATE-TIME:20160726T140000Z
DTEND;VALUE=DATE-TIME:20160726T142000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2393@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Mario Giuliani (University of Graz)\nWe study new de
velopments for the Density of States (DoS) method to simulate systems\na
ﬀected by the complex action problem. In particular we use the functiona
l ﬁt approach\n(FFA). It consists of a restricted Monte Carlo simulation
with an additional Boltzmann \nfactor\, which allows one to explore the D
oS for a given part of the spectrum. We\nﬁt the simulation data with a k
nown function to obtain the parameters of the DoS.\nWe apply the approach
to two model systems: 1) The SU(3) spin system with a chemical potential\;
2) The SU3 gauge theory with static quarks. We discuss the technical chal
lenges \nand the potential of FFA DoS.\n\nhttps://conference.ippp.dur.ac.u
k/event/470/contributions/2393/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2393/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QCD with isospin chemical potential: low densities and Taylor expa
nsion
DTSTART;VALUE=DATE-TIME:20160728T155000Z
DTEND;VALUE=DATE-TIME:20160728T161000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2392@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Bastian Brandt (University of Frankfurt)\nWe investi
gate the phase diagram of QCD at finite isospin chemical potential using 2
+1 flavours of staggered fermions with physical quark masses at different
lattice spacings and volumes. In this talk we focus on the region of small
isospin chemical potential below the phase boundary to the pion condensat
ion phase and investigate the change of the transition temperature with th
e chemical potential. To investigate the convergence properties and the ra
nge of validity of the Taylor expansion method at a given order\, we compa
re our results to the Taylor expansion for finite isospin chemical potenti
al at 4 derivative order. This can serve as an important crosscheck for th
e Taylor expansion method at finite baryon chemical potential\, where dire
ct simulations are impossible due to the sign problem.\n\nhttps://conferen
ce.ippp.dur.ac.uk/event/470/contributions/2392/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2392/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Computing the nucleon Dirac radius directly at $Q^2=0$
DTSTART;VALUE=DATE-TIME:20160728T142000Z
DTEND;VALUE=DATE-TIME:20160728T144000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2391@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Nesreen Hasan (Bergische Universitaet Wuppertal)\nWe
describe a lattice approach for directly computing momentum derivatives\n
of nucleon matrix elements using the Rome method\, which we apply\nto obt
ain the isovector magnetic moment and Dirac radius. We present preliminary
\n results calculated at the physical pion mass using a 2HEX-smeared\nWils
on-clover action from the Budapest-Marseille-Wuppertal collaboration.\nFor
removing the effects of excited-states contamination\, the calculations\n
were done at three source-sink separations and the summation method was\nu
sed.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2391/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2391/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards the continuum limit with improved Wilson fermions employin
g open boundary conditions. Part 2.
DTSTART;VALUE=DATE-TIME:20160729T155000Z
DTEND;VALUE=DATE-TIME:20160729T161000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2390@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Gunnar Bali (University of Regensburg)\nWe present r
esults obtained by RQCD on various observables\, obtained from simulations
of $N_f=2+1$ flavours of non-perturbatively order-$a$ improved Wilson fer
mions\, employing open boundary conditions in time\, that were created wit
hin the CLS (Coordinated Lattice Simulations) effort. Configurations at fi
ve different values of the lattice spacing\, ranging from 0.086 fm down to
below 0.04 fm exist and many quark mass combinations\, in particular alon
g a line of an (almost) constant sum of quark masses and a constant renorm
alized strange quark mass have been generated. Several key observables\, m
ostly meson and baryon masses have been computed\, and these results will
be presented. In some cases a precise and controlled extrapolation to the
continuum limit has become possible.\n\nhttps://conference.ippp.dur.ac.uk/
event/470/contributions/2390/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2390/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Borici-Creutz fermions on 2-dim lattice
DTSTART;VALUE=DATE-TIME:20160726T161000Z
DTEND;VALUE=DATE-TIME:20160726T163000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2389@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Jishnu Goswami (IIT Kanpur)\nMinimally doubled fermi
ons(MDF) having only two species could be\npromising formalism to study ch
iral fermion on a lattice. The action being ultra-local\, one expects that
the MDF formulations might provide computationally cheaper\nalternatives
to the existing lattice chiral formulations. Borici-Creutz fermion is one
such\nminimally doubled fermion formulation. In this work\, we explore th
e Borici-Creutz fermion\nformulation in simple a 2d Gross-Neveu model and
in QED2 with Hybrid Monte Carlo simulation. We study chiral symmetry break
ing and mass spectrum in Gross-Neveu model .\n\nhttps://conference.ippp.d
ur.ac.uk/event/470/contributions/2389/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2389/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Comparing different definitions of the topological charge
DTSTART;VALUE=DATE-TIME:20160727T103000Z
DTEND;VALUE=DATE-TIME:20160727T105000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2388@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Andreas Athenodorou (University of Cyprus)\nWe perfo
rm a numerical comparison of different lattice definitions of the topologi
cal charge by investigating the correlation coefficient between different
definitions as well as the topological susceptibility. We use small-volume
ensembles with 2 flavours of dynamical twisted mass fermions. We investig
ate the following definitions of the topological charge: index of the over
lap Dirac operator\, spectral flow of the Hermitian Wilson-Dirac operator\
, spectral projectors and field theoretic extracted with the smoothing sch
emes of APE\, stout and HYP smearing schemes as well as cooling and the re
cently introduced gradient flow. Furthermore\, we carry out a (tree-level)
perturbative comparison between the smoothing procedures of the gradient
flow\, cooling as well as APE and stout smearing. We demonstrate both anal
ytically and numerically that the above smoothing schemes are equivalent i
f the smoothing scales (flow time\, number of cooling or smearing steps) a
re rescaled properly. Moreover\, we demonstrate that HYP smearing is numer
ically equivalent with all the above smoothers. We show that the generally
high correlation between different definitions increases towards the cont
inuum limit.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/
2388/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2388/
END:VEVENT
BEGIN:VEVENT
SUMMARY:New simulation strategies for lattice QCD
DTSTART;VALUE=DATE-TIME:20160726T084500Z
DTEND;VALUE=DATE-TIME:20160726T091500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2387@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Michael Endres (MIT)\nDespite the numerous successfu
l applications of lattice QCD in nuclear and particle theory\, fundamental
algorithmic challenges remain. Among those\, relevant for numerical studi
es of QCD on a space time torus\, is topological freezing--a form of criti
cal slowing down\, which becomes particularly severe for lattice spacing l
ess than 0.05 fm. In this talk\, I will highlight several recently propose
d simulation strategies for ameliorating the problem of topological freezi
ng\, discussing both the advantages and disadvantages of such approaches.
Then\, I will turn focus toward strategies for addressing critical slowing
down in a more general context.\n\nhttps://conference.ippp.dur.ac.uk/even
t/470/contributions/2387/
LOCATION:Highfield Campus\, University of Southampton Building 32 (EEE) Ro
om 1015 and Building 67 (Nightingale) Room 1027 via video link
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2387/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Isospin-breaking effects for meson masses and HVP\, from Lattice Q
CD + quenched QED
DTSTART;VALUE=DATE-TIME:20160726T140000Z
DTEND;VALUE=DATE-TIME:20160726T142000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2386@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: James Harrison (University of Southampton)\nLattice
calculations of the leading-order hadronic contribution to the muon g-2\,
from the hadronic vacuum polarisation\, are approaching sub-percent level
precision. At this level\, it becomes important to consider corrections fr
om isospin-breaking. Here\, we include quenched QED in our simulations by
stochastically generating U(1) gauge configurations and combining these wi
th existing SU(3) gauge configurations. We will present some first results
for meson masses and HVP using this method\, obtained on a 24^3 x 64\, N_
f=2+1 ensemble using domain wall fermions. This calculation will be direct
ly compared to the perturbative approach presented by Vera Gülpers.\n\nht
tps://conference.ippp.dur.ac.uk/event/470/contributions/2386/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2386/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Utilising optimised operators and distillation to extract scatteri
ng phase shifts
DTSTART;VALUE=DATE-TIME:20160726T134000Z
DTEND;VALUE=DATE-TIME:20160726T140000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2385@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Antoni Woss (University of Cambridge)\nDistillation
is a method of smearing that allows for the efficient computation of corre
lation functions on the lattice. It vastly reduces the number of operation
s needed to calculate correlation functions with large bases of operators
and all-to-all propagators. In this investigation\, we provide a comprehen
sive comparison of the quality of extracted energy spectra with different
amounts of distillation smearing for the isospin-1 $\\pi\\pi$\, $\\rho$ li
ke channel. Results are demonstrated in the determination of the mass spec
tra and also the scattering phase shift and mass and width of the resonant
$\\rho$ via the Luscher method.\n\nhttps://conference.ippp.dur.ac.uk/even
t/470/contributions/2385/
LOCATION:Highfield Campus\, University of Southampton Bulding B2a Room 206
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2385/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Moments of the hadron vacuum polarization at the physical point
DTSTART;VALUE=DATE-TIME:20160726T155000Z
DTEND;VALUE=DATE-TIME:20160726T161000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2384@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Kohtaroh Miura (Centre de Physique Theorique\, Aix-M
arseille Universite\, BMW Collaboration)\nThe low\, euclidean momentum beh
avior of the hadron vacuum polarization (HVP) is critical for determining\
, amongst other quantities\, the anomalous magnetic moments of the electro
n and the muon. Here we present lattice QCD results for the first few mome
nts of the HVP obtained from 2+1+1 flavor\, staggered-quark simulations at
the physical point. The various quark-flavor contributions\, together wit
h their systematics\, will be discussed.\n\nhttps://conference.ippp.dur.ac
.uk/event/470/contributions/2384/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2384/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Heavy and light spectroscopy near the physical point\, Part II: Te
traquarks
DTSTART;VALUE=DATE-TIME:20160725T133500Z
DTEND;VALUE=DATE-TIME:20160725T135500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2383@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Anthony Francis (York University)\nHaving introduced
the ensembles and basic spectrum in Part I\, we focus on results for a do
ubly heavy tetraquark candidate\, $qq\\bar Q \\bar Q$. Based on phenomenol
ogical observations regarding heavy baryon systems\, we motivate two possi
ble lattice interpolating operators: a diquark-anti diquark and a meson-me
son. We show these operators exhibit good behaviour both in terms of latti
ce QCD and their phenomenological interpretation. In particular we study t
he $qq\\bar b \\bar b$\, $qq\\bar c \\bar b$ and $qq\\bar c \\bar c$ with
$qq=ud\,us$ flavor combinations and analyze their binding. In the chiral l
imit\, at finite lattice spacing\, we find strong indications for binding
of the $qq=ud$ tetraquark candidates. We comment on possible search window
s for experimental confirmation.\n\nhttps://conference.ippp.dur.ac.uk/even
t/470/contributions/2383/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2383/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Heavy and light spectroscopy near the physical point\, Part I: Cha
rm and bottom baryons
DTSTART;VALUE=DATE-TIME:20160725T131500Z
DTEND;VALUE=DATE-TIME:20160725T133500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2382@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Renwick J. Hudspith (York University)\nWe present re
sults of the hadron spectrum using $n_f=2+1$ ensembles with pion masses as
low as 156(4) MeV\, we place particular emphasis on measurements of the s
ingly and doubly heavy charm and bottom baryons.\nUsing the Tsukuba tuning
for relativistic charm and NRQCD for the bottom quarks we perform measure
ments of both light and heavy mesons as well as spin-1/2 and spin-3/2 bary
ons for all possible flavor combinations. Our subsequent analysis yields m
asses with an accuracy below the $1\\%$-level and therefore splittings wit
h good statistical precision. All results are extrapolated to the physical
pion mass via a tightly controlled\, short\, chiral extrapolation.\n\nhtt
ps://conference.ippp.dur.ac.uk/event/470/contributions/2382/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2382/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Beyond the Standard Model: Charting Fundamental Interactions via L
attice Simulations
DTSTART;VALUE=DATE-TIME:20160730T080000Z
DTEND;VALUE=DATE-TIME:20160730T084500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2381@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Claudio Pica (University of Southern Denmark)\nAfter
the discovery of the Higgs boson\, the primary objective of the Large Had
ron Collider (LHC) experiments is to identify new physics beyond the Stand
ard Model (SM). In fact\, both ATLAS and CMS are providing precision tests
of the Higgs sector and tantalizing hints of new\, unexpected resonances.
\n\nOne of the most intriguing possibilities would be the discovery of non
-perturbative phenomena in electroweak physics. Most strikingly\, there is
no conclusive evidence yet on whether the Higgs boson is elementary or co
mposite.\n\nLattice simulations can play a key role in advancing our theor
etical understanding of strongly coupled gauge theories relevant for exten
sions of the SM and the LHC program. In this talk I will review the state
of BSM lattice studies aimed to chart the phase diagram and to uncover the
properties of such strongly coupled gauge theories.\n\nhttps://conference
.ippp.dur.ac.uk/event/470/contributions/2381/
LOCATION:University of Southampton\, Highfield Campus Building 32 (EEE) Ro
om 1015 and Building 67 (Nightingale) Room 1027 via video link
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2381/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-perturbative running of quark masses in three-flavour QCD
DTSTART;VALUE=DATE-TIME:20160726T134000Z
DTEND;VALUE=DATE-TIME:20160726T140000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2380@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: David Preti (Instituto de Física Teórica CSIC/UAM)
\nWe present our results for the computation of the non-perturbative runni
ng\n of renormalized quark masses in $N_f=3$ QCD\, between the electrow
eak and\n hadronic scales\, using standard finite-size scaling techniqu
es. The\n computation is carried out to very high precision\, using mas
sless\n $\\mathcal{O}$(a) improved Wilson quarks. Following the strateg
y adopted by\n the ALPHA Collaboration for the running coupling\, diffe
rent schemes are used\n above and below a scale $\\mu_{\\rm swi} \\sim
m_b$\, which differ by using\n either the Schrödinger Functional or Gr
adient Flow renormalized coupling. We\n discuss our results for the run
ning in both regions\, and the procedure to\n match the two schemes.\n\
nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2380/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2380/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Adaptive Aggregation-based Domain Decomposition Multigrid for Twis
ted Mass Fermions
DTSTART;VALUE=DATE-TIME:20160727T090000Z
DTEND;VALUE=DATE-TIME:20160727T092000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2379@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Simone Bacchio (University of Cyprus - University o
f Wuppertal)\nWe extend the Adaptive Aggregation Based Domain Decompositio
n Multigrid (DD-$\\alpha$AMG) algorithm to $N_f=2$ twisted mass fermions.
We show numerical results for an $N_f=2$ ensemble of twisted fermions with
a clover term simulated at the physical value of the pion mass. We fine-
tuned the parameters to achieve a speedup comparable to the one obtained f
or clover fermions. We also present a complete analysis of the aggregation
parameters that provides a novel insight on the multigrid methods for lat
tice QCD independently of the fermion discretization.\n\nhttps://conferenc
e.ippp.dur.ac.uk/event/470/contributions/2379/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2379/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Coupled-channel analysis of $D\\pi$\, $D\\eta$ and $D_{s}\\bar{K}$
scattering using lattice QCD
DTSTART;VALUE=DATE-TIME:20160728T140000Z
DTEND;VALUE=DATE-TIME:20160728T142000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2378@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Graham Moir (University of Cambridge)\nWe present an
extensive study of isospin $1/2$ coupled-channel $D\\pi$\, $D\\eta$ and $
D_{s}\\bar{K}$ scattering\,\nas well as isospin $3/2$ elastic $D\\pi$ scat
tering\, from $N_{f} = 2+1$ lattice QCD. Our use of distillation in combin
ation with variationally optimised interpolating operators allows us to ex
tract statistically precise two-meson spectra\, which we use to constrain
scattering amplitudes as a function of energy. We interpret our results in
terms of poles in the scattering matrix\, finding a near-threshold bound
state in S-wave\, a deeply bound vector state in P-wave and a narrow reson
ance in D-wave.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributio
ns/2378/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2378/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A simple method to optimize HMC performance
DTSTART;VALUE=DATE-TIME:20160727T094000Z
DTEND;VALUE=DATE-TIME:20160727T100000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2377@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Andrea Bussone (Univeristy of Southern Denmark &\
; CP3 Origins)\nWe present a cheap strategy to optimize Hybrid Monte Carlo
parameters\nin simulations of QCD and QCD-like theories. We specialize to
the case of\nmass-preconditioning\, with multiple-time-step Omelyan integ
rators.\nStarting from properties of the shadow Hamiltonian we show how th
e\noptimal setup for the integrator can be chosen once the forces and\nthe
ir variances are measured\, assuming that those only depend on the\nmass-p
reconditioning parameter.\n\nhttps://conference.ippp.dur.ac.uk/event/470/c
ontributions/2377/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2377/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$B\\to K^*$ decays in a finite volume
DTSTART;VALUE=DATE-TIME:20160726T130000Z
DTEND;VALUE=DATE-TIME:20160726T132000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2376@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Akaki Rusetski (HISKP\, University of Bonn\, Germany
)\nWe propose a framework for the extraction of the $B\\to K^*$ decay form
factors from lattice data\, based on the non-relativistic effective field
theory in a finite volume. A possible admixture of the $\\eta K$ channel
is studied\, and the multi-channel Lellouch-Luescher formula is reproduced
. Further\, a procedure is\nformulated for the extraction of the form-fact
ors at the resonance pole. The definition of the photon virtuality at the
resonance pole is discussed. The limit of an infinitely narrow resonance i
s investigated in detail in the multi-channel case.\n\nhttps://conference.
ippp.dur.ac.uk/event/470/contributions/2376/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2376/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hadronic contributions to the muon $g-2$ from lattice QCD
DTSTART;VALUE=DATE-TIME:20160725T103000Z
DTEND;VALUE=DATE-TIME:20160725T111500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2375@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Hartmut Wittig (University of Mainz)\nThe overall ac
curacy of the Standard Model prediction of the anomalous\nmagnetic mome
nt of the muon is currently limited by hadronic\neffects. I review the sta
tus of lattice QCD calculations\, aimed at\nproviding precise estimates fo
r the hadronic vacuum polarisation and\nhadronic light-by-light scattering
contributions\, respectively. In the\ncase of the leading hadronic vacuum
polarisation contribution I will\nfocus on systematic effects in current
lattice simulations and outline\nthe progress made in computing the contri
butions from\nquark-disconnected diagrams. For the hadronic light-by-light
\nscattering contribution the different computational and conceptual\nstra
tegies employed by various groups will be reviewed.\n\nhttps://conference.
ippp.dur.ac.uk/event/470/contributions/2375/
LOCATION:University of Southampton Building 32 (EEE) Room 1015 and Buildin
g 67 (Nightingale) Room 1027 via video link
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2375/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Impact of lattice QCD on CKM phenomenology
DTSTART;VALUE=DATE-TIME:20160728T080000Z
DTEND;VALUE=DATE-TIME:20160728T084500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2374@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Monika Blanke (Karlsruhe Institute of Technology)\nI
n this talk I review the implications of recent lattice QCD results on the
phenomenology of flavour and CP-violating meson decays. Precise lattice Q
CD results for hadronic matrix elements\, decay constants and form factors
play a crucial role in the determination of CKM matrix elements and in th
e identification of possible new physics contributions to flavour violatin
g observables. I also highlight some possible future directions for lattic
e QCD calculations which would have a big impact on flavour phenomenology.
\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2374/
LOCATION:University of Southampton\, Highfield Campus Building 32 (EEE) Ro
om 1015 and Building 67 (Nightingale) Room 1027 via video link
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2374/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Complex Langevin Dynamics for a Random Matrix Model of QCD at fini
te density
DTSTART;VALUE=DATE-TIME:20160726T142000Z
DTEND;VALUE=DATE-TIME:20160726T144000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2373@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Savvas Zafeiropoulos (Goethe University Frankfurt)\n
We study a Random Matrix Model for QCD at finite density via Complex Lange
vin dynamics. This model has a phase transition to a phase with non-zero b
aryon density. We study the convergence of the algorithm as a function of
the quark mass and the chemical potential and focus on two main observable
s: the baryon density and the chiral condensate. As expected\, for simulat
ions close to the chiral limit\, the algorithm has wrong convergence prope
rties when the quark mass is in the spectral domain of the quenched Dirac
operator. Possible solutions of this problem are discussed.\n\nhttps://co
nference.ippp.dur.ac.uk/event/470/contributions/2373/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2373/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Charge radii and higher electromagnetic moments with lattice QCD i
n nonuniform background fields
DTSTART;VALUE=DATE-TIME:20160728T130000Z
DTEND;VALUE=DATE-TIME:20160728T132000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2372@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Zohreh Davoudi (MIT)\nNonuniform background electrom
agnetic fields\, once implemented in lattice QCD calculations of hadronic
systems\, provide a means to constrain a large class of electromagnetic pr
operties\, from higher electromagnetic moments and charge radii to electro
magnetic form factors. In this talk\, I present the recent theoretical dev
elopments in realizing general background fields in periodic hypercubic la
ttices\, along with a numerical illustration of the formalism. Additionall
y\, I will briefly explain the formal procedure that allows the extraction
of the charge radius and the quadruple moment of hadrons and light nuclei
by matching an appropriate effective hadronic theory to lattice QCD corre
lation functions in a linearly varying electric field in space.\n\nhttps:/
/conference.ippp.dur.ac.uk/event/470/contributions/2372/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2372/
END:VEVENT
BEGIN:VEVENT
SUMMARY:From C to Parton Sea: Bjorken-x dependence of the PDFs
DTSTART;VALUE=DATE-TIME:20160726T110000Z
DTEND;VALUE=DATE-TIME:20160726T113000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2371@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Huey-Wen Lin (Michigan State University)\nStudying t
he structure of nucleons is not only important to understanding the strong
interactions of quarks and gluons\, but also to improving the precision o
f new-physics searches.\nSince a broad class of experiments\, including th
e LHC and dark-matter detection\, require Standard-Model backgrounds with
parton distribution functions (PDFs) as inputs for disentangling SM contri
butions from potential new physics. \nFor a long time\, lattice calculatio
ns of the PDFs (as well as many hadron \nstructures) has been limited to t
he first few moments. \nIn this talk\, we present a first direct calculati
on of the Bjorken-x dependence\nof the PDFs using Large-Momentum Effective
Theory \n(LaMET). An exploratory study of the antiquark/sea flavor asymme
try of\nthese distributions will be discussed. This breakthrough opens an
exciting\nnew frontier calculating more complicated quantities\, such as g
luon\nstructure and transverse-momentum dependence\, which will complement
\nexisting theoretical programs for the upcoming Electron-Ion Collider (EI
C) or Large Hadron-Electron Collider (LHeC).\n\nhttps://conference.ippp.du
r.ac.uk/event/470/contributions/2371/
LOCATION:University of Southampton\, Highfield Campus Building 32 (EEE) Ro
om 1015 and Building 67 (Nightingale) Room 1027 via video link
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2371/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hadron scattering and resonances
DTSTART;VALUE=DATE-TIME:20160726T142000Z
DTEND;VALUE=DATE-TIME:20160726T144000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2370@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Raul Briceno (Thomas Jefferson National Accelerator
Facillity)\nIn this talk\, I present recent progress towards the determina
tion of resonant systems via lattice QCD. The truncation of the volume --
necessary for lattice QCD calculations -- significantly alters the analyti
c structure of the theory. For scattering processes involving two-hadron s
tates\, this can be circumvented by utilizing formalism to map finite-volu
me quantities obtained onto the desired infinite-volume observables. I ill
ustrate the power of these techniques by highlighting some important examp
les in the light sector of QCD.\n\nhttps://conference.ippp.dur.ac.uk/event
/470/contributions/2370/
LOCATION:Highfield Campus\, University of Southampton Bulding B2a Room 206
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2370/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice QCD study of heavy-heavy-light-light tetraquark candidates
DTSTART;VALUE=DATE-TIME:20160725T143500Z
DTEND;VALUE=DATE-TIME:20160725T145500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2369@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Antje Peters (Goethe-Universität Frankfurt am Main)
\nWe study $\\bar{b} \\bar{b} u d$ and $\\bar{b} b u \\bar{d}$ four-quark
systems using lattice QCD. The heavy b quarks are treated either in the st
atic approximation or by using NRQCD. Both for $\\bar{b} \\bar{b} u d$ (qu
antum numbers $I(J^P) = 0(1^+)$) and for $\\bar{b} b u \\bar{d}$ (quantum
numbers of $Z_b$\, $I(J^P) = 1(1^+)$) our results indicate the existence o
f a four-quark bound state\, i.e. a tetraquark.\n\nhttps://conference.ippp
.dur.ac.uk/event/470/contributions/2369/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2369/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Precision determination of the strong coupling at the electroweak
scale
DTSTART;VALUE=DATE-TIME:20160725T162500Z
DTEND;VALUE=DATE-TIME:20160725T164500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2368@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Rainer Sommer (NIC @ DESY)\nThe ALPHA-collaboration
computation \nof the three-flavor Lambda-parameter and the determination o
f $\\alpha(m_Z)$\nconsists of the steps:\nRunning from beyond the Z-mass t
o 4 GeV in the SF scheme\, \nmatching to the GF scheme\, \nrunning from 4G
eV to small energy in the GF scheme\,\ndetermining the smallest energy sca
le ($\\approx$ 200 MeV) in\nphysical units with the help of the CLS simula
tions.\nWe summarize the first steps and discuss the last one in detail.\n
We then present our final result for $\\Lambda_{\\rm \\overline{MS}}^{(3)}
$ with its error budget.\nFinally\, the connection of the three-flavor the
ory to the five-flavor\n$\\alpha(m_Z)$ uses decoupling and high order pert
urbation theory in the $\\rm \\overline{MS}$ scheme.\n\nhttps://conference
.ippp.dur.ac.uk/event/470/contributions/2368/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2368/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Some Statistics on Women in Lattice QCD
DTSTART;VALUE=DATE-TIME:20160726T180000Z
DTEND;VALUE=DATE-TIME:20160726T190000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2367@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Huey-Wen Lin (Michigan State University)\nWe present
a sampling of analyses concerning the gender ratio of plenary speakers du
ring the years 2000-2016 and make comparisons with other conferences\, suc
h as the APS April meeting. Please stop by to discuss ideas for how to mak
e our field more accessible to women and minorities. We are preparing for
an in-depth survey of the lattice field and welcome any ideas or suggestio
ns. To leave post-conference comments and read about news affecting women
in our field\, see our Facebook page: https://www.facebook.com/WLQCD\n\nht
tps://conference.ippp.dur.ac.uk/event/470/contributions/2367/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2367/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Slab Method to Measure the Topological Susceptibility
DTSTART;VALUE=DATE-TIME:20160725T131500Z
DTEND;VALUE=DATE-TIME:20160725T133500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2366@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Wolfgang Bietenholz (UNAM\, Mexico)\nIn simulations
of a model with topological sectors\,\nalgorithms which proceed in small u
pdate steps\ntend to get stuck in one sector\, especially on fine \nlattic
es. This distorts the numerical results\; in \nparticular it is not straig
htforward to measure the \ntopological susceptibility chi_t.\nHere we test
a method to measure chi_t even if configurations \nfrom only one sector a
re available. It is based on the topological\ncharges in sub-volumes\, whi
ch we denote as ''slabs''. Under\nsuitable circumstances\, this enables th
e evaluation of chi_t\,\nas we demonstrate with numerical data for non-lin
ear sigma-models\nand 2-flavor QCD.\n\nhttps://conference.ippp.dur.ac.uk/e
vent/470/contributions/2366/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2366/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Including heavy spin effects in a lattice QCD study of static-stat
ic-light-light tetraquarks
DTSTART;VALUE=DATE-TIME:20160725T141500Z
DTEND;VALUE=DATE-TIME:20160725T143500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2365@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Pedro Bicudo (Universidade de Lisboa)\nIn previous w
orks we predicted the existence of a $\\bar{b} \\bar{b} u d$ tetraquark wi
th quantum numbers $I(J^P) = 0(1^+)$ using the static approximation for th
e $\\bar{b}$ quarks and neglecting heavy spin effects. Since the binding e
nergy is of the same order as expected for these heavy spin effects\, it i
s essential to include them in the computation. Here we present a correspo
nding method and show evidence that binding is only slightly weakened and
that the $\\bar{b} \\bar{b} u d$ tetraquark persists.\n\nhttps://conferenc
e.ippp.dur.ac.uk/event/470/contributions/2365/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2365/
END:VEVENT
BEGIN:VEVENT
SUMMARY:SUNny gluonia as DM
DTSTART;VALUE=DATE-TIME:20160727T103000Z
DTEND;VALUE=DATE-TIME:20160727T105000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2364@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: amarjit soni (BNL)\nWe investigate the possibility t
hat the dark matter candidate is from a pure non-abelian gauge theory of t
he hidden sector\, motivated in large part by its elegance and simplicity.
The dark matter is the lightest bound state made of the confined gauge f
ields\, the hidden glueball. We point out this simple setup is capable of
providing rich and novel phenomena in the dark sector\, especially in the
parameter space of large $N$. They include self-interacting and warm dark
matter scenarios\, Bose-Einstein condensation leading to massive dark star
s possibly millions of times heavier than our sun giving rise to gravitati
onal lensing effects\, and indirect detections through higher dimensional
operators as well as interesting collider signatures. Non-perturbative rel
evant studies to further our understandings of these uniquely simple non-a
belian gauge theories are suggested. This talk is based on arXiv:1602.0071
4 [to appear in Phys. Rev. D] with Yue Zhang [CIT] and more in progress w
ith him.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2364
/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2364/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A high-statistics lattice QCD study of nucleon sigma terms
DTSTART;VALUE=DATE-TIME:20160728T132000Z
DTEND;VALUE=DATE-TIME:20160728T134000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2585@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Laurent Lellouch (CNRS & Aix-Marseille U.)\nFor the
Budapest-Marseille-Wuppertal collaboration\n\nWe present a lattice study o
f the u\, d and s quark contents of the nucleon\, determined using the Fey
nman-Hellmann theorem. Results are obtained from twenty-nine high-statisti
cs simulations with four flavors of O(a)-improved Wilson quarks\, four lat
tice spacings and a variety of quark masses.\n\nhttps://conference.ippp.du
r.ac.uk/event/470/contributions/2585/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2585/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Overcoming strong metastabilities with the LLR method
DTSTART;VALUE=DATE-TIME:20160726T165000Z
DTEND;VALUE=DATE-TIME:20160726T171000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2584@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Biagio Lucini (Swansea University)\nIt has been show
n that the recently proposed LLR method is very efficient at overcoming st
rong metastabilities that arise near first-order phase transition points.
Here we present a systematic study of the performance of the algorithm nea
r (pseudo)critical points on q-state Potts models for q as large as 20\, i
n two and three dimensions. In particular\, we shall focus our study on th
e ergodicity of the replica exchange step and the underlying physical mech
anism. Our results for thermodynamic observables (including interface tens
ions at criticality) are also discussed.\n\nhttps://conference.ippp.dur.ac
.uk/event/470/contributions/2584/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2584/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Estimating excited-state contamination in nucleon correlators usin
g experimental data
DTSTART;VALUE=DATE-TIME:20160729T132000Z
DTEND;VALUE=DATE-TIME:20160729T134000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2583@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Maxwell Hansen (University of Mainz)\nExcited-state
contamination is one of the dominant uncertainties in lattice calculations
of nucleon charges and form factors. To estimate this uncertainty one nee
ds the finite-volume energy spectrum as well as the finite-volume matrix e
lements that determine the coefficients of excited state exponentials. In
this work we use experimental data\, supplemented by chiral perturbation t
heory (ChPT)\, to estimate these quantities. We first use the Lüscher qua
ntization condition\, extended to spin-half particles\, to calculate finit
e-volume $N \\pi$ states from $N \\pi$ scattering phase shifts. We then st
udy the excited state coefficients using an extension of the Lellouch-Lüs
cher formalism. This gives a relation between finite- and infinite-volume
matrix elements. Both matrix elements of the axial current and the nucleon
interpolating fields arise. While the former can be constrained experimen
tally\, the latter are generally unknown and depend on the details of the
lattice calculation. We examine various scenarios and find that excited-st
ate contamination can be larger than previous ChPT studies suggest.\n\nhtt
ps://conference.ippp.dur.ac.uk/event/470/contributions/2583/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2583/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Spectroscopy of charmed mesons from lattice QCD
DTSTART;VALUE=DATE-TIME:20160728T132000Z
DTEND;VALUE=DATE-TIME:20160728T134000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2582@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: David Tims (Trinity College Dublin)\nCharmed meson s
pectroscopy with data generated by the Hadron Spectrum\nCollaboration is p
resented\, using two ensembles with different light\nsea-quark masses to i
nvestigate the effect of the sea quark mass on the\nspectrum. Initial resu
lts from an investigation of the contribution of\nthe disconnected quark-l
ine diagram on the charmonium hyperfine\nsplitting will be presented\, inc
luding a comparison with quenched data.\n\nhttps://conference.ippp.dur.ac.
uk/event/470/contributions/2582/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2582/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The connected and leading disconnected diagrams of the hadronic li
ght-by-light contribution to muon $g-2$
DTSTART;VALUE=DATE-TIME:20160726T132000Z
DTEND;VALUE=DATE-TIME:20160726T134000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2581@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Luchang Jin (Columbia University)\nWe report our rec
ent lattice calculation of hadronic light-by-light contribution to muon $g
-2$ using our recent developed moment method. The connected diagrams and t
he leading disconnected diagrams are included. The calculation is performe
d on a $48^3 \\times 96$ lattice with physical pion mass and 5.5 fm box si
ze. We expect sizable finite volume and finite lattice spacing corrections
to the results of these calculations which will be estimated in calculati
ons to be carried out over the next 1-2 years.\n\nhttps://conference.ippp.
dur.ac.uk/event/470/contributions/2581/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2581/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Progress in the calculation of epsilon' on the lattice
DTSTART;VALUE=DATE-TIME:20160728T155000Z
DTEND;VALUE=DATE-TIME:20160728T161000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2580@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Christopher Kelly (Columbia University)\nWe discuss
recent progress by the RBC & UKQCD collaborations in the lattice calculati
on of the measure of Standard Model direct CP violation\, \\epsilon'\, wit
h physical kinematics. We present results with improved systematic errors
resulting from the use of step-scaling to\nreduce the renormalization erro
r\, an analysis that also takes into account the one-loop-suppressed mixin
g with the G_1 two-quark operator. We also review our progress in decreasi
ng the dominant statistical error on our result.\n\nhttps://conference.ipp
p.dur.ac.uk/event/470/contributions/2580/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2580/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Domain Wall Fermion Simulations with the Exact One-Flavor Algorith
m
DTSTART;VALUE=DATE-TIME:20160727T092000Z
DTEND;VALUE=DATE-TIME:20160727T094000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2579@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: David Murphy (Columbia University)\nAs algorithmic d
evelopments have driven down the cost of simulating degenerate light quark
pairs the relative cost of simulating single quark flavors with the Ratio
nal Hybrid Monte Carlo (RHMC) algorithm has become more expensive. TWQCD h
as proposed an exact one-flavor algorithm (EOFA) that allows for HMC simul
ations of a single quark flavor without taking a square root of the fermio
n determinant. We have independently implemented EOFA for Shamir and M\\"{
o}bius domain wall fermions\, and begun to optimize and test our implement
ation against RHMC. In this talk we will discuss the derivation of the EOF
A action\, our tests of its equivalence to RHMC\, and the current state of
our implementation and optimization.\n\nhttps://conference.ippp.dur.ac.uk
/event/470/contributions/2579/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2579/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Scaling and properties of 1/a = 1 GeV\, 2+1 flavor Mobius Domain W
all Fermion ensembles
DTSTART;VALUE=DATE-TIME:20160729T161000Z
DTEND;VALUE=DATE-TIME:20160729T163000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2578@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Robert Mawhinney (Columbia University)\nThe RBC and
UKQCD Collaborations have used 2+1 flavor\nDomain Wall Fermion ensembles\,
generated with the Iwasaki gauge\naction plus the Dislocation Suppressing
Determinant Ratio (DSDR)\,\nfor a variety of calculations\, including our
ongoing G-parity\ncalculation of $K \\to \\pi \\pi$ matrix elements. The
se calculations\nhave been done with 1/a = 1.35 GeV. With the HotQCD Coll
aboration\,\nzero and finite temperature ensembles at even coarser lattice
\nspacings\, 1/a = 1 GeV\, have been produced. These coarse\, zero\ntempe
rature ensembles have been included in global fits for light\nhadronic obs
ervables and show scaling errors of a few percent for\nthem. Large physic
al volume ensembles at 1/a = 1 GeV\nare being generated for a variety of m
easurements and our ongoing\ninvestigation of their properties will be pre
sented.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2578/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2578/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thermodynamics with physical mass staggered quarks
DTSTART;VALUE=DATE-TIME:20160725T131500Z
DTEND;VALUE=DATE-TIME:20160725T133500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2577@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Kalman Szabo (U Wuppertal\, FZ Juelich)\nFinite temp
erature lattice QCD is investigated with four flavor physical mass stagger
ed quarks using lattices upto N_t=20. Results for the equation of state an
d the low-lying modes of the Dirac-operator are presented with a focus on
lattice artefacts.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contribu
tions/2577/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2577/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Progress Report on Staggered Multigrid
DTSTART;VALUE=DATE-TIME:20160728T140000Z
DTEND;VALUE=DATE-TIME:20160728T142000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2576@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Evan Weinberg (Boston University)\nAs the push towar
ds the exascale enables increasingly accurate lattice calculations\, the i
nversion of the Dirac matrix becomes a superlinearly growing expense. Adap
tive algebraic multigrid (AAMG) methods for all fermion discretizations ar
e essential to address this phenomena of critical slowing down. As a preco
nditioner\, AAMG expedites Dirac matrix inversions with manageable start u
p costs. This is important for modern lattice measurements which require t
he efficient computation of an increasing number of Dirac propagators. In
this talk we will discuss progress towards the development of an AAMG algo
rithm for staggered fermions based upon the successful implementation of W
ilson-Clover multigrid. Optimal performance is being sought in the QUDA li
brary on GPUs.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contribution
s/2576/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2576/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Axion Phenomenology from Unquenched Lattice QCD
DTSTART;VALUE=DATE-TIME:20160729T130000Z
DTEND;VALUE=DATE-TIME:20160729T132000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2575@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Guido Martinelli (Universita' di Roma "La Sapienza"
and Cern)\nWe investigate the topological properties of $N_f = 2 + 1$ QCD
with\nphysical quark masses\, both at zero and finite temperature. At zero
\ntemperature both finite size and finite cut-off effects have been\nstud
ied by comparing the continuum extrapolated results for the\ntopologica
l susceptibility $\\chi$ with the predictions from chiral\nperturbation th
eory. At finite temperature\, we explore a region going\nfrom $T_c$ up to
around $4T_c$\, where continuum extrapolated results for the\ntopological
susceptibility and for the fourth moment of the topological\ncharge distr
ibution are obtained. While the fourth moment converges to\nthe dilute in
stanton gas prediction the topological susceptibility\ndiffers strongly b
oth in the size and in the temperature dependence.\nThis results in a shif
t of the axion dark matter window of almost one\norder of magnitude with r
espect to the instanton computation.\n\nhttps://conference.ippp.dur.ac.uk/
event/470/contributions/2575/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2575/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Continuing the Saga of Fluffy Mirror Fermions
DTSTART;VALUE=DATE-TIME:20160727T090000Z
DTEND;VALUE=DATE-TIME:20160727T092000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2574@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Dorota Grabowska (INT/UW)\nI discuss continuing work
on a recent proposal for the nonperturbative regulator for chiral gauge t
heories which combines domain wall fermions and gradient flow\, Phys.Rev.
Lett. 116 (2016) 211602. Implementing chiral gauge theories on the lattice
requires not only decoupling mirror fermions to allow for fermions in com
plex representations\, but also a road to failure for theories with fermio
ns in anomalous representations. Unlike attempts to gap the mirror fermion
spectrum\, this proposal gives the mirror fermions exponentially soft for
m factors\, allowing them to decouple from ordinary matter except through
nontrivial gauge field topology. I discuss progress on various open questi
ons for this formulation that were left unresolved in the original work.\n
\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2574/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2574/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Nuclear and Chiral Transition in the Strong Coupling Regime of
Lattice QCD
DTSTART;VALUE=DATE-TIME:20160729T153000Z
DTEND;VALUE=DATE-TIME:20160729T155000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2573@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Wolfgang Unger (Bielefeld University)\nLattice QCD i
n the strong coupling limit with staggered quarks gives rise to a dual rep
resentation. Here\, the sign problem is mild enough to study the phase dia
gram at finite density. In the strong coupling limit\, the first order nuc
lear and chiral transition at low temperatures coincide due to Pauli satur
ation. \n\nAway from the strong coupling limit\, incorporating higher orde
r gauge corrections\, both transitions are expected to split\, with an int
ermediate phase of nuclear matter where chiral symmetry is still broken. \
n \nWe show numerical evidence from Monte Carlo simulations in the dual re
presentation that indicate this splitting.\n\nhttps://conference.ippp.dur.
ac.uk/event/470/contributions/2573/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2573/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Metadynamics Remedies for Topological Freezing
DTSTART;VALUE=DATE-TIME:20160726T171000Z
DTEND;VALUE=DATE-TIME:20160726T173000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2572@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Francesco Sanfilippo (University of Southampton)\nMe
tadynamics is a class of powerful algorithms in which the time evolution o
f a system is modified introducing a history-dependent potential associate
d with the past values of observables of choice. This has the effect of dr
iving the system away from previously occupied states\, ultimately speedin
g up the evolution of the system.\nThese methods are widely used in bioche
mistry and computational physics\, and are especially suitable for solving
problems in which the free energy presents a many-minima landscape. In th
is talk I will show a successful application of Metadynamics to the critic
al slowing down of the topological charge in CP(N-1) models\, discussing t
he scaling of the performances with volume and lattice spacing\, limitatio
ns and future improvements\, and giving also a first glance of application
s to lattice QCD.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contribut
ions/2572/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2572/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Neutrinoless double beta decay from lattice QCD
DTSTART;VALUE=DATE-TIME:20160728T091500Z
DTEND;VALUE=DATE-TIME:20160728T094500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2571@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Amy Nicholson (UC Berkeley)\nWhile the discovery of
non-zero neutrino masses is one of the most important accomplishments by p
hysicists in the past century\, it is still unknown how and in what form t
hese masses arise. Lepton number-violating neutrinoless double beta decay
is a natural consequence of Majorana neutrinos and many BSM theories\, and
several experimental efforts are involved in the search for these process
es. Understanding how neutrinoless double beta decay would manifest in nuc
lear environments is key for understanding any observed signals. In this t
alk I will present an overview of a set of one- and two-body matrix elemen
ts relevant for experimental searches for neutrinoless double beta decay\,
along with preliminary lattice QCD results.\n\nhttps://conference.ippp.du
r.ac.uk/event/470/contributions/2571/
LOCATION:University of Southampton\, Highfield Campus Building 32 (EEE) Ro
om 1015 and Building 67 (Nightingale) Room 1027 via video link
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2571/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Flux Tubes at Finite Temperature
DTSTART;VALUE=DATE-TIME:20160726T180000Z
DTEND;VALUE=DATE-TIME:20160726T190000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2570@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Pedro Bicudo (IST - LISBOA)\nWe show the flux tubes
produced by static quark-antiquark\,\nquark-quark and quark-gluon charges
at finite temperature.\nThe sources are placed in the lattice with fundame
ntal and adjoint Polyakov loops. \nWe compute the square densities of the
chromomagnetic and chromoelectric fields above and below the phase transit
ion. \nOur results are gauge invariant and produced in pure gauge SU(3).\n
The codes are written in CUDA and the computations are performed with GPUs
.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2570/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2570/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Physical spectra and the limits of perturbative estimates in a the
ory with a Higgs
DTSTART;VALUE=DATE-TIME:20160728T140000Z
DTEND;VALUE=DATE-TIME:20160728T142000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2569@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Axel Maas (University of Graz)\nThe spectacular succ
ess of perturbation theory in electroweak physics hinges on the validity o
f the Froehlich-Morchio-Strocchi mechanism. This mechanism allows the dete
rmination of the spectrum of physical\, gauge-invariant states using pertu
rbation theory if a Brout-Englert-Higgs effect is present. For this mechan
ism to work two preconditions have to be met. One is the structural requir
ement that the perturbative multiplet structure can be mapped to the physi
cal one. The other requires that dynamically the pole structure of gauge-d
ependent correlation functions is not qualitatively altered. To assess the
validity of perturbation theory to describe the spectrum in beyond-the-st
andard model calculations requires to understand when these conditions are
fulfilled.\n\nThe second condition will be investigated in the Yang-Mills
-Higgs case on the lattice. It is found that it depends crucially on the p
arameters whether this condition is fulfilled. Even in cases where perturb
ation theory should be expected to work well it turns out that it does not
. Various possibilities for a criterion for this breakdown will be discuss
ed. As a side-effect the physical spectrum of the theory in a wide range o
f the phase diagram is uncovered\, which is also valuable for several othe
r research directions.\n\nhttps://conference.ippp.dur.ac.uk/event/470/cont
ributions/2569/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2569/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Parity doubling in two-color and two-flavor gauge theory at high t
emperature
DTSTART;VALUE=DATE-TIME:20160729T134000Z
DTEND;VALUE=DATE-TIME:20160729T140000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2568@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Jong-Wan Lee (Swansea University)\nRecently the two-
color gauge theory with two flavors of fundamental fermions has received c
onsiderable attention in BSM model building\, as it provides a minimal tem
plate for a composite Higgs theory that includes dark matter candidates. I
n this work\, we consider the two-color model with two flavors of Wilson f
ermions at non-zero temperature. For a more reliable investigation of meso
n correlation functions at high temperature\, we perform simulations on an
isotropic lattices with a target anisotropic factor of a_s/a_t=6.3. The tu
ning of bare parameters was carried out using the pseudo-scalar dispersion
relation and Wilson loop ratios. We present our preliminary results for t
he identification of parity doubling from the temporal and spacial correla
tion functions of vector and axial-vector mesons.\n\nhttps://conference.ip
pp.dur.ac.uk/event/470/contributions/2568/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2568/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Continuum limit and universality of the Columbia plot
DTSTART;VALUE=DATE-TIME:20160725T141500Z
DTEND;VALUE=DATE-TIME:20160725T143500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2567@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Philippe de Forcrand (ETH Zurich &\; CERN)\nIn it
s lower left corner\, the Columbia plot indicates a first-order\nfinite-te
mperature phase transition\, which turns into a crossover\nas the quark ma
sses increase. The locus of quark masses giving a\nsecond-order transition
is a feature of continuum QCD\, and should\nbe recovered with any fermion
discretization. However\, numerical\nevidence has been accumulating\, dis
favoring universality.\nWe explore this puzzle with 4 degenerate flavors o
f staggered\nfermions\, thus avoiding any potential problem associated wit
h rooting.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/25
67/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2567/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Open charm correlators and spectral functions at high temperature
DTSTART;VALUE=DATE-TIME:20160728T130000Z
DTEND;VALUE=DATE-TIME:20160728T132000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2566@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Jon-Ivar Skullerud (Maynooth University)\nWe present
results for correlators and spectral functions of open charm mesons using
2+1 flavours of clover fermions on anisotropic lattices. The D mesons ar
e found to melt close to the deconfinement crossover temperature $T_c$. O
ur preliminary results suggest a shift in the thermal D meson mass below $
T_c$.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2566/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2566/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Optimization of the Domain Wall Dslash Kernel in Columbia Physics
System
DTSTART;VALUE=DATE-TIME:20160727T103000Z
DTEND;VALUE=DATE-TIME:20160727T105000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2565@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Meifeng Lin (Brookhaven National Laboratory)\nWe pre
sent updated strategies and results of combining hand-tuning with the R-St
ream source-to-source auto-parallelizing compiler to transform the serial
implementation of the domain wall fermion Dslash kernel in CPS into an eff
icient parallel code targeting the Intel Xeon CPUs. The R-Stream compiler
performs preliminary optimizations of the input Dslash code\, including a
novel iteration space compression scheme\, while the SIMD optimization is
done with a data layout transformation and compiler intrinsics. Tuning for
the OpenMP and MPI scaling will also be discussed.\n\nhttps://conference.
ippp.dur.ac.uk/event/470/contributions/2565/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2565/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$B_{(s)}\\to D_{(s)}$ semileptonic decays with NRQCD-HISQ valence
quarks
DTSTART;VALUE=DATE-TIME:20160727T090000Z
DTEND;VALUE=DATE-TIME:20160727T092000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2564@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Chris Monahan (Rutgers\, the State University of New
Jersey)\nWe present a calculation of the form factors\, $f_0$ and $f_+$\,
for the $B_{(s)}$ to $D_{(s)}$ semileptonic decays. Our work uses the MI
LC $n_f=2+1$ asqtad configurations with NRQCD and HISQ valence quarks at f
our values of the momentum transfer $q^2$. We present preliminary results
for our combined chiral-continuum extrapolation.\n\nhttps://conference.ipp
p.dur.ac.uk/event/470/contributions/2564/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2564/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Using a new analysis method to extract excited states in the scala
r meson sector
DTSTART;VALUE=DATE-TIME:20160725T160500Z
DTEND;VALUE=DATE-TIME:20160725T162500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2563@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Jacob Finkenrath (german)\nWe present an alternative
method to the Generalized Eigenvalue Problem (GEVP) for extracting excite
d states.\nThe method is based on statistically sampling the space of poss
ible set of parameters according to the $\\chi^2$-value of each set of val
ues.\nThis method is particularly suited when one has noisy data as is the
case for some correlators at large times\nsuch as in the scalar light qqb
ar channel. We will apply this method to the analysis of the $J^P = 0^+$ c
hannels used in the search for \nthe $a_0$ particle and compare the result
s to the standard GEVP approach\, pointing out\nadvantages and disadvantag
es of the method compare to the GEVP approach.\n\nhttps://conference.ippp.
dur.ac.uk/event/470/contributions/2563/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2563/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice QCD calculation of form factors for $\\Lambda_b \\to \\Lam
bda(1520) \\ell^+ \\ell^-$ decays
DTSTART;VALUE=DATE-TIME:20160729T155000Z
DTEND;VALUE=DATE-TIME:20160729T161000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2562@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Stefan Meinel (University of Arizona / RIKEN BNL Res
earch Center)\nExperimental results for mesonic $b \\to s \\mu^+ \\mu^-$ d
ecays show a pattern of deviations from Standard-Model predictions. These
deviations could be due to new fundamental physics or due to an insufficie
nt understanding of hadronic effects. Complementary information on the $b
\\to s \\mu^+ \\mu^-$ transition can be obtained from $\\Lambda_b$ decays.
This was recently done using the process $\\Lambda_b \\to \\Lambda \\mu^+
\\mu^-$\, where the $\\Lambda$ is the lightest strange baryon. A further
interesting channel that is being analyzed by LHCb is $\\Lambda_b \\to p^+
K^- \\mu^+ \\mu^-$\, where the $p^+ K^-$ final state receives contributio
ns from multiple higher-mass $\\Lambda$ resonances. The narrowest and most
prominent of these is the $\\Lambda(1520)$\, which has $J^P=\\frac32^-$.
We discuss our progress toward a lattice QCD calculation of the relevant $
\\Lambda_b \\to \\Lambda(1520)$ form factors.\n\nhttps://conference.ippp.d
ur.ac.uk/event/470/contributions/2562/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2562/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Electromagnetic corrections to leptonic decay rates of charged pse
udoscalar mesons: finite volume effects.
DTSTART;VALUE=DATE-TIME:20160727T105000Z
DTEND;VALUE=DATE-TIME:20160727T111000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2561@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Nazario Tantalo (Rome University Tor Vergata and INF
N sez. of Rome Tor Vergata)\nIn Ref.[1] we proposed a method for calculat
ing leptonic (and semileptonic) decay rates of pseudoscalar mesons includi
ng $O(\\alpha)$ electromagnetic corrections. Because of the presence of in
frared divergences\, this requires the calculation of contributions with b
oth virtual and real photons. We have shown that the real photon contribut
ion\, by integrating up to photon momenta of the order of 20-30 MeV\, can
be calculated by treating the meson as a point-like particle. The correct
ions to this approximation are negligible because a very soft photon canno
t resolve the internal structure of the hadron.\n\nFor the virtual contrib
ution we need to integrate over all photon momenta and the point-like effe
ctive theory is not a valid approximation. For this reason we proposed to
compute the virtual contribution by a non-perturbative lattice simulation.
The logarithmic infrared divergences are properly regulated by the finite
volume and are cancelled by subtracting from the non-perturbative lattice
results the virtual decay rate calculated in the point-like approximation
.\n\nIn this talk we discuss two main analytic results. First we give the
explicit analytical expression of the finite volume virtual decay rate in
the point-like approximation\, necessary for the cancellation of the infr
ared divergences. We also show explicitly that the $O(1/L)$ finite volum
e corrections (FVC) to the virtual decay rate are universal\, i.e. they a
re the same in the full theory and in the point-like effective theory. The
y therefore cancel in the difference of the non-perturbative decay rate an
d that in the point-like approximation. Structure dependent terms start to
contribute to the FVC at $O(1/L^2)$ only.\n\nWith the theoretical results
discussed in this talk all the ingredients are now in place to compute th
e decay rates at $O(\\alpha)$. The numerical results from an exploratory n
on-perturbative lattice calculation will be presented by S. Simula in a co
mpanion talk.\n\n[1]. N. Carrasco et al.\, Phys. Rev. D91 (2015) 074506.\n
\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2561/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2561/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A variational method for spectral functions
DTSTART;VALUE=DATE-TIME:20160726T134000Z
DTEND;VALUE=DATE-TIME:20160726T140000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2560@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Daniel Robaina (Institute for Nuclear Physics Mainz)
\nThe Generalized Eigenvalue Problem (GEVP) has been intensively used in t
he past in order to reliably extract energy levels from time-dependent euc
lidean correlators calculated in Lattice QCD. We propose an alternative fo
rmulation of the GEVP in frequency space. Our approach consists in applyin
g the model independent Backus-Gilbert method to a set of euclidean two-po
int functions with common quantum numbers. A GEVP analysis in frequency sp
ace is then applied to a matrix of estimators that allows us\, among other
things\, to obtain particular linear combinations of the initial set of o
perators that optimally overlap to different local regions in frequency. T
his approach can be interesting both for vacuum physics as well as for fin
ite temperature problems.\n\nhttps://conference.ippp.dur.ac.uk/event/470/c
ontributions/2560/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2560/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The QCD equation of state at finite density from analytical contin
uation
DTSTART;VALUE=DATE-TIME:20160727T105000Z
DTEND;VALUE=DATE-TIME:20160727T111000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2559@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Jana Günther (University of Wuppertal)\nAn efficien
t way to study the QCD phase diagram at small finite density is to extrapo
late thermodynamical observables from imaginary chemical potential. In thi
s talk we present results on several observables for the equation of state
to order (muB/T)^6. The observables are calculated along the isentropic t
rajectories in the (T\, muB ) plane corresponding to the RHIC Beam Energy
Scan collision energies. The simulations are performed at the physical mas
s for the light and strange quarks. muS was tuned in a way to enforce stra
ngeness neutrality to match the experimental conditions\; the results are
continuum extrapolated using lattices of up to Nt = 16 temporal resolution
.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2559/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2559/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Talk withdrawn
DTSTART;VALUE=DATE-TIME:20160727T084000Z
DTEND;VALUE=DATE-TIME:20160727T090000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2558@conference.ippp.dur.ac.uk
DESCRIPTION:https://conference.ippp.dur.ac.uk/event/470/contributions/2558
/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2558/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Welcome
DTSTART;VALUE=DATE-TIME:20160725T080000Z
DTEND;VALUE=DATE-TIME:20160725T081500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2557@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Sachrajda ()\nhttps://conference.ippp.dur.ac.uk/even
t/470/contributions/2557/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5 and Building 67 Room 1027 (via Video link)
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2557/
END:VEVENT
BEGIN:VEVENT
SUMMARY:From the Origins of Mass to the Stability of Matter: Lattice QCD
and Supercomputers
DTSTART;VALUE=DATE-TIME:20160725T180000Z
DTEND;VALUE=DATE-TIME:20160725T190000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2556@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Laurent Lellouch (CNRS &\; Aix-Marseille U.)\nThe
origin of mass is mysterious. In our everyday experience\, the mass of a
n object is the sum of the mass of its parts. However\, in the world of su
batomic particles such as quarks and gluons\, this everyday assumption is
no longer true and even very small mass differences can have cosmic conseq
uences. After an introduction to the subatomic world and the mechanisms by
which mass emerges\, I will describe how supercomputers are being used to
compute from first principles the interactions between elementary particl
es in order to reveal the origins of mass and to explain the stability of
the matter which constitutes us and the visible universe.\n\nTickets for t
his public lecture can be booked via Eventbrite http://latticeqcd.eventbri
te.co.uk/ .\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2
556/
LOCATION:Highfield Campus\, University of Southampton Building 58 Room 106
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2556/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards a determination of the ratio of the kaon to pion decay con
stants
DTSTART;VALUE=DATE-TIME:20160728T140000Z
DTEND;VALUE=DATE-TIME:20160728T142000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2554@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Roger Horsley (University of Edinburgh)\nThe SU(3) f
lavour symmetry breaking expansion in up\, down and\nstrange quark masses
is extended from hadron masses to meson\ndecay constants. This allows a de
termination of the ratio of\nkaon to pion decay constants in QCD. Furtherm
ore when using\npartially quenched valence quarks the expansion is such th
at\nSU(2) isospin breaking effects can also be determined. It is\nfound th
at the lowest order SU(3) flavour symmetry breaking\nexpansion (Gell-Mann-
Okubo) works very well. Simulations are\nperformed for 2+1 flavours of clo
ver fermions at 4 lattice spacings.\n\nhttps://conference.ippp.dur.ac.uk/e
vent/470/contributions/2554/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2554/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pseudo-scalar decay constants on three-flavour CLS ensembles with
open boundaries
DTSTART;VALUE=DATE-TIME:20160726T180000Z
DTEND;VALUE=DATE-TIME:20160726T190000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2553@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Stefan Hofmann (Unversity of Regensburg) (German)\nW
e determine the masses and the pseudo-scalar decay constants of\ncharmed m
esons using non-perturbatively O($a$) improved Wilson quarks.\nOur analysi
s is based on the $N_{\\rm f}=2+1$ ensembles using open\nboundary conditio
ns\, generated within the CLS effort.\nThe status of results for 2 lattice
spacings\, $a\\approx 0.086$ fm and\n$a\\approx 0.064$ fm\, will be prese
nted. The pion mass is varied from\n420 to 220 MeV. This is part of a cont
inuing analysis by the RQCD\nand ALPHA Collaborations\, aiming at a stable
continuum extrapolation\nusing several lattice spacings. To extrapolate t
o the physical masses\,\nwe follow both\, the $(2m_l+m_s)=\\mathrm{const.}
$ and\n$m_s=\\mathrm{const.}$ line.\n\nhttps://conference.ippp.dur.ac.uk/e
vent/470/contributions/2553/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2553/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Determination of topological charge following several definitions
DTSTART;VALUE=DATE-TIME:20160725T133500Z
DTEND;VALUE=DATE-TIME:20160725T135500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2552@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Julien Frison (KEK Theory Center)\nOn the lattice\,
many definitions of the topological charge $Q$ coexist\, and can give very
different numbers on a given configuration. \nThose definitions will only
converge when one takes the continuum limit of the moments $\\langle Q^n\
\rangle$ (provided that $Q$ has been correctly renormalised). \nAdditional
ly\, other complications arise when one wants to study the mass dependence
of the topological susceptibility\, because of the mixing of the two oper
ators under renormalisation. It is therefore unclear to which extent each
definition of $Q$ is compatible with each definition of the masses. \nHere
we will present the results of some tests following various choices of de
finition. In a second part\, we will discuss the potential consequences of
that ambiguity on the discarding of $m_u=0$ as a solution to the strong $
CP$ problem.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/
2552/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2552/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Radiative contribution to the effective potential in a composite H
iggs model
DTSTART;VALUE=DATE-TIME:20160728T161000Z
DTEND;VALUE=DATE-TIME:20160728T163000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2551@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Benjamin Svetitsky (Tel Aviv University)\nThe SU(4)
gauge theory with two flavors of Dirac fermions in the sextet representati
on shares features of a candidate for a composite Higgs model. The analogu
e of the Higgs multiplet of the Standard Model lives in the Goldstone mani
fold resulting from spontaneous breaking of the global symmetry SU(4) to S
O(4). The Higgs potential arises from interaction with the particles of th
e Standard Model. We have computed the gauge boson contribution to the Hi
ggs potential\, using valence overlap fermions on a Wilson-clover sea. The
calculation is similar to that of the electromagnetic mass splitting of t
he pion multiplet in QCD.\n\nhttps://conference.ippp.dur.ac.uk/event/470/c
ontributions/2551/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2551/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lines of Constant Physics in a 5-d Gauge-Higgs Unification Scenari
o
DTSTART;VALUE=DATE-TIME:20160728T134000Z
DTEND;VALUE=DATE-TIME:20160728T140000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2550@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Maurizio Alberti (University of Wuppertal)\nWe repor
t on the progress in the study of a five-dimensional SU(2) Gauge-Higgs Uni
fication model.\nIn the non-perturbative study\, the Higgs mechanism is tr
iggered by the spontaneous breaking of a\nglobal symmetry. In the same reg
ion of the phase diagram\, we observe both dimensional reduction\nand the
ratio of Higgs and Z boson masses to take the value known from experiment.
\n\nWe present the first results on the construction of a line of constant
physics in this region\,\nincluding the prediction for the mass scale of
the first excited states of the Higgs and gauge bosons.\n\nhttps://confere
nce.ippp.dur.ac.uk/event/470/contributions/2550/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2550/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Reweighting trajectories from the complex Langevin method
DTSTART;VALUE=DATE-TIME:20160726T171000Z
DTEND;VALUE=DATE-TIME:20160726T173000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2549@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Jacques Bloch (University of Regensburg)\nWe introdu
ce the reweighted complex Langevin method\, which enlarges the applicabili
ty range of the complex Langevin method by reweighting the complex traject
ories. In this reweighting procedure both the auxiliary and target ensembl
es have a complex action. We validate the method by applying it to a rando
m matrix model for QCD and to two-dimensional strong-coupling QCD\, both a
t nonzero chemical potential\, and observe that it gives access to mass re
gions that could otherwise not be reached with the complex Langevin method
.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2549/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2549/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ground state charmed meson and baryon spectra for $N_f=2+1+1$
DTSTART;VALUE=DATE-TIME:20160726T180000Z
DTEND;VALUE=DATE-TIME:20160726T190000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2547@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Thomas Rae (University of Wuppertal)\nWe present a s
tudy of the charmed meson and baryon ground state spectra\non the electric
ally neutral subset of the BMW $N_f=2+1+1$ gauge\nconfigurations that util
ise the 3-HEX smeared clover action. The\nanalysis focuses on a systematic
evaluation of the hyperfine\nmass splittings of the doubly charmed $J/\\p
si$ and $\\eta_{c}$ mesons and\nthe singly charmed $D_s^*$ and $D_s$ meson
s\, with the aim to understand\nthe significant cut-off effects that can a
ccompany Wilson type\nfermion measurements.\n\nhttps://conference.ippp.dur
.ac.uk/event/470/contributions/2547/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2547/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Stochastic approaches to extract spectral functions from Euclidean
correlators
DTSTART;VALUE=DATE-TIME:20160728T134000Z
DTEND;VALUE=DATE-TIME:20160728T140000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2546@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Haitao Shu (CCNU)\nThe spectral functions provide us
the knowledge to understand the in-medium hadron and transport properties
of the QCD medium. For instance\, quantities like thermal dilepton produc
tion and photon emission rates of QGP can be obtained from the vector spec
tral functions. Though spectral functions are important\, they can not be
obtained directly from Euclidean lattice QCD calculations. Analytic contin
uations to real time are needed to extract spectral functions from Euclide
an correlation functions. Currently the most commonly used method is the M
aximum Entropy Method (MEM). To investigate the systematic uncertainties i
n spectral function reconstructions we study two stochastic approaches\, i
.e. Stochastic Optimization Method (SOM) and Stochastic Analytical Inferen
ce (SAI). SOM has advantage that it does not need any prior information. S
AI is more generalized method\, which reduces to the MEM in the mean-field
limit. We compare results obtained from these two methods with those from
MEM by investigating various model correlation functions.\n\nhttps://conf
erence.ippp.dur.ac.uk/event/470/contributions/2546/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2546/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Rho meson decay width in SU(2) gauge theories with 2 fundamental f
lavours.
DTSTART;VALUE=DATE-TIME:20160728T153000Z
DTEND;VALUE=DATE-TIME:20160728T155000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2545@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Tadeusz Janowski (CP3-Origins)\nSU(2) gauge theories
with two quark flavours in the fundamental\nrepresentation are among the
most promising theories of composite dynamics\ndescribing the electroweak
sector. Three out of five Goldstone bosons in\nthese models become the lon
gitudinal components of the W and Z bosons giving\nthem mass. Like in QCD
we expect a spectrum of excitations which appear as\nresonances in vector
boson scattering\, in particular the vector resonance\ncorresponding to th
e rho-meson in QCD.\n\nIn this talk I will present the preliminary results
of the first calculation\nof the rho-meson decay width in this theory\, w
hich is analogous to rho to\ntwo pions decay calculation in QCD. The resul
ts presented were calculated\nusing 2 moving frames on s single ensemble.
Future plans include using 3\nmoving frames on a larger set of ensembles t
o extract the resonance\nparameters more reliably and also take the chiral
and continuum limits.\n\nhttps://conference.ippp.dur.ac.uk/event/470/cont
ributions/2545/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2545/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice QCD simulation of the Berry curvature
DTSTART;VALUE=DATE-TIME:20160725T145500Z
DTEND;VALUE=DATE-TIME:20160725T151500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2544@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Arata Yamamoto (University of Tokyo)\nThe Berry curv
ature is a fundamental concept describing topological order of quantum sys
tems.\nWhile it can be analytically tractable in non-interacting systems\,
numerical simulations are necessary in interacting systems.\nWe present a
formulation to calculate the Berry curvature in lattice QCD.\n\nhttps://c
onference.ippp.dur.ac.uk/event/470/contributions/2544/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2544/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quark confinement to be caused by Abelian or non-Abelian dual supe
rconductivity in the $SU(3)$ Yang-Mills theory
DTSTART;VALUE=DATE-TIME:20160729T161000Z
DTEND;VALUE=DATE-TIME:20160729T163000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2543@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Akihiro Shibata (Computing Research Center\, KEK)\n\
nThe dual superconductivity is a promising mechanism for quark confinement
. We have presented a new formulation of the Yang-Mills theory on the lat
tice\, that enables us to change the original non-Abelian gauge field int
o the new field variables such that one of them called the restricted fiel
d gives the dominant contribution to quark confinement in the gauge-indepe
ndent way. \n We have pointed out that the $SU(3)$ Yang-Mills theory has
a new way of reformulation using new field variables (minimal option)\, i
n addition to the conventional option adopted by Cho\, Faddeev and Niemi (
maximal option). In the preceding lattice conferences\, we have accumulat
ed the numerical evidences that support the non-Abelian dual superconduct
ivity using the minimal option for the SU(3) Yang-Mills theory. This shou
ld be compared with Abelian dual superconductivity from the maximal optio
n which is a gauge invariant version of the conventional Abelian projectio
n method in the maximal Abelian gauge. \n In this talk\, We focus on di
scriminating between two reformulations\, i.e.\, maximal and minimal optio
ns of $SU(3)$ Yang-Mills theory for quark confinement from the viewpoint
of dual superconductivity. We investigate the dual Meissner effect at fin
ite temperature and the phase transition in both options which are compare
d with the original Yang-Mills theory. For this purpose\, we measure the
distribution of the chromoelectric flux connecting a quark and an antiquar
k and the induced magnetic-monopole current around the flux tube in both c
onfinement/deconfinement phase. \n\n\nhttps://conference.ippp.dur.ac.uk/ev
ent/470/contributions/2543/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2543/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On complex Langevin dynamics and zeroes of the determinant
DTSTART;VALUE=DATE-TIME:20160726T155000Z
DTEND;VALUE=DATE-TIME:20160726T161000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2542@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Gert Aarts (Swansea University)\nIn the complex Lang
evin approach to lattice simulations at nonzero density\, zeroes of the fe
rmion determinant lead to a meromorphic drift and hence a need to revisit
the theoretical justification. In this talk we discuss how poles in the dr
ift affect the formal justification of the approach and then explore the v
arious possibilities in simple models. The implications of the findings fo
r heavy dense QCD and full QCD are discussed.\n\nhttps://conference.ippp.d
ur.ac.uk/event/470/contributions/2542/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2542/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quark Mass Dependence of the QCD Critical End Point in the Strong
Coupling Limit
DTSTART;VALUE=DATE-TIME:20160729T155000Z
DTEND;VALUE=DATE-TIME:20160729T161000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2541@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Jangho KIM (Fakultät für Physik\, Universität Bie
lefeld)\nStrong coupling lattice QCD in the dual representation allows to
study the full mu-T phase diagram\, due to the mildness of the sign proble
m. This has been done in the chiral limit. Here we extend the phase diagra
m to finite quark masses. We present our results on the quark mass depende
nce of the QCD critical end point obtained by Monte Carlo via the worm alg
orithm. We compare our simulations which are performed on 4^3x4\, 6^3x4\,
8^3x4\, 12^3x4\, 16^3x4 lattices with mean field results.\n\nhttps://confe
rence.ippp.dur.ac.uk/event/470/contributions/2541/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2541/
END:VEVENT
BEGIN:VEVENT
SUMMARY:S-duality in lattice N=4 super Yang-Mills
DTSTART;VALUE=DATE-TIME:20160726T155000Z
DTEND;VALUE=DATE-TIME:20160726T161000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2540@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Joel Giedt (Rensselaer Polytechnic Institute)\nFormu
lations of lattice supersymmetry over the last decade have been able to si
gnificantly reduce the amount of fine-tuning necessary in order to obtain
the correct continuum limit. In the case of N=4 super Yang-Mills\, the ap
proach that has emerged as the best path forward is based on a topological
twisting of the theory. Montonen and Olive found evidence that a duality
could exist in Yang-Mills with adjoint scalars. In this scheme\, the 't H
ooft-Polyakov monopole is dual to the W boson\,leading to a theory equival
ent to the original one\, but with magnetic charge replacing electric char
ge. The duality is believed to be realized in N=4 super-Yang-Mills. We a
re pursuing numerical\, nonperturbative evidence for this S-duality using
our lattice formulation. The various tricks that are necessary for doing t
his will be described.\n\nhttps://conference.ippp.dur.ac.uk/event/470/cont
ributions/2540/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2540/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hypercubic effects in semileptonic $D \\to \\pi$ decays on the lat
tice
DTSTART;VALUE=DATE-TIME:20160729T134000Z
DTEND;VALUE=DATE-TIME:20160729T140000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2539@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Giorgio Salerno (Università di Roma Tre)\nWe presen
t lattice results of the form factors relevant for semileptonic $D\\to\\pi
\\ell \\nu$ decays\, using the gauge ensembles produced by the European T
wisted Mass Collaboration with Nf=2+1+1 flavors of dynamical quarks\, at t
hree values of the lattice spacing and pion masses as low as 210 MeV.\nWe
have computed the matrix elements of both the vector and scalar weak curre
nts for several kinematic configurations corresponding to moving parent an
d child mesons. The lattice data exhibit the presence of hypercubic effect
s. Our preliminary results for the momentum dependence of the form factors
and for the vector form factor at zero-momentum transfer\, f+(0)\, are ob
tained by removing such lattice effects.\n\nhttps://conference.ippp.dur.ac
.uk/event/470/contributions/2539/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2539/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Numerical Analysis of Discretized ${\\mathcal N}=(2\,2)$ SYM on Po
lyhedra
DTSTART;VALUE=DATE-TIME:20160726T153000Z
DTEND;VALUE=DATE-TIME:20160726T155000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2538@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Syo Kamata (Keio University)\nWe investigate the two
-dimensional $\\mathcal{N}=(2\,2)$ supersymmetric \nYang-Mills (SYM) theor
y on the discretized curved space both from theoretical and numerical poin
ts of view. \nWe first show that the number of the supersymmetry of the co
ntinuum $\\mathcal{N}=(2\,2)$ SYM theory on any curved manifold is enhance
d to two by considering an appropriate $U(1)$ gauge backgrounds associated
with the $U_{V}(1)$ symmetry.\nWe then show that the generalized Sugino m
odel\, which was proposed in our previous work\, \ncan be identified to th
e discretization of the SUSY enhanced theory\, \nwhere one of the supersym
metries is kept and the other one is restored in the continuum limit.\nThe
$U_{A}(1)$ anomaly of the continuum theory is maintained also in the disc
retized theory as an unbalance of the number of the fermions. \nWe study t
he discretized supersymmetric model based on the numerical Monte-Carlo sim
ulation.\nIn the process\, we propose a novel phase-quenched approximation
\, which we call the ``anomaly-phase-quench approximation".\nWe find that
the Ward-Takahashi (WT) identity expected from the analytical study realiz
es in the model and there is no sign-problem by adopting the anomaly-phase
-quench method. \nThe result is the first numerical observation for the su
persymmetric lattice model on the curved space with generic topologies.\n\
nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2538/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2538/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Competing order in the fermionic Hubbard model on the hexagonal gr
aphene lattice
DTSTART;VALUE=DATE-TIME:20160727T094000Z
DTEND;VALUE=DATE-TIME:20160727T100000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2537@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Lorenz von Smekal (Justus-Liebig University Giessen)
\nWe study the phase diagram of the fermionic Hubbard model on the hexagon
al lattice in the space of on-site and nearest neighbor couplings with Hyb
rid-Monte-Carlo simulations. With pure on-site repulsion this allows to de
termine the critical coupling strength for spin-density wave formation. We
compare the standard approach of introducing a small mass term\, explicit
ly breaking the sublattice symmetry\, with a purely geometric mass\, i.e.
using lattices and boundary conditions such that the Dirac points fall in
between the grid points inside the Brillouin zone without explicit sublatt
ice-symmetry breaking. For the first method we extrapolate the correspondi
ng susceptibility peaks towards zero mass and infinite volume in the usual
way\, while with the geometric mass only infinite volume extrapolation is
needed. An added bonus is that it can be used with nearest neighbor repul
sion and charge-density wave formation where the corresponding mass term w
ould introduce a sign problem. The geometric mass thus provides a promisin
g method to study the competition between these different types of order a
nd the resulting phase diagram with ab-initio simulations.\n\nhttps://conf
erence.ippp.dur.ac.uk/event/470/contributions/2537/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2537/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Applications of Jarzynski's relation in lattice gauge theories
DTSTART;VALUE=DATE-TIME:20160726T161000Z
DTEND;VALUE=DATE-TIME:20160726T163000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2536@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Alessandro Nada (Università di Torino & INFN\, Tori
no)\nJarzynski's equality is a well-known result in statistical mechanics\
, relating free-energy differences between equilibrium ensembles with fluc
tuations in the work performed during non-equilibrium transformations from
one ensemble to the other.\nIn this talk\, an extension of this relation
to lattice gauge theory will be presented\, along with numerical results f
or the $Z_2$ gauge model in three dimensions and for the equation of state
in SU(2) Yang-Mills theory in four dimensions. Then\, further application
s will be discussed\, in particular for the Schroedinger functional and fo
r the study of QCD\nin strong magnetic fields.\n\nhttps://conference.ippp.
dur.ac.uk/event/470/contributions/2536/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2536/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Heavy flavours in quark-gluon plasma
DTSTART;VALUE=DATE-TIME:20160729T084500Z
DTEND;VALUE=DATE-TIME:20160729T091500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2535@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Seyong Kim (Sejong University)\nHeavy quark system o
ffers opportunities and challenges for theoretical (and experimental) inve
stigations on the properties of Quark-Gluon Plasma (QGP). Here\, recent pr
ogresses in the studies of heavy quarks and quarkonia in QGP are discussed
. In particular\, the results from the calculation of heavy quark kinetic/
chemical equilibration in QGP and those from the studies of quarkonia beha
viors at non-zero temperature are discussed.\n\nhttps://conference.ippp.du
r.ac.uk/event/470/contributions/2535/
LOCATION:University of Southampton\, Highfield Campus Building 32 (EEE) Ro
om 1015 and Building 67 (Nightingale) Room 1027 via video link
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2535/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On the nature of an excited state
DTSTART;VALUE=DATE-TIME:20160729T130000Z
DTEND;VALUE=DATE-TIME:20160729T132000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2534@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Benoît Blossier (CNRS/LPT Orsay)\nIn many lattice s
imulations with dynamical quarks\, radial or orbital \nexcitations of hadr
ons lie near multihadron thresholds: it makes the \nextraction of excited
states properties more challenging and cqn introduce \nsome systematics di
fficult to estimate without an explicit computation of \ncorrelators using
interpolating fields strongly coupled to multihadronic \nstates. In a rec
ent study of the strong decay of the first radial excitation \nof the $B^*
$ meson\, this issue has been investigated and we have clues that \na diqu
ark interpolating field $\\bar{b} \\gamma^i q$ is very weakly coupled to a
\n$B \\pi$ $P$-wave state while the situation is quite different if we co
nsider an \ninterpolating field of the kind $\\bar{b} \\nabla^i q$\, where
$\\vec{\\nabla}$ is a \ncovariant derivative: those statements are based
on examining the charge \ndensity distribution.\n\nhttps://conference.ippp
.dur.ac.uk/event/470/contributions/2534/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2534/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Baryon interactions from lattice QCD with physical masses -- S=-2
sector --
DTSTART;VALUE=DATE-TIME:20160729T134000Z
DTEND;VALUE=DATE-TIME:20160729T140000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2533@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Kenji Sasaki (Kyoto University)\nBaryon interactions
are crucial to study a bound and/or resonance state in multi-baryon syste
ms.\nIn spite of their importance\, phenomenological baryon potentials hav
e large uncertainties because of the lack of experimental scattering data.
\nIn recent studies\, the HAL QCD method allow us to extract baryon intera
ctions from the Nambu-Bethe-Salpeter wave functions without using experime
ntal data.\nWe present our latest result on the S = -2 baryon interactions
and discuss the H-dibaryon state using potentials which are calculated by
using the (almost) physical point gauge configurations with large lattice
volume of (8fm)^4 generated on the K-computer.\n\nhttps://conference.ippp
.dur.ac.uk/event/470/contributions/2533/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2533/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Spontaneous symmetry breaking induced by complex fermion determina
nt --- yet another success of the complex Langevin method
DTSTART;VALUE=DATE-TIME:20160726T144000Z
DTEND;VALUE=DATE-TIME:20160726T150000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2532@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Yuta Ito (KEK)\nIn many interesting systems\, the fe
rmion determinant becomes complex and its phase plays a crucial role in th
e determination of the vacuum. For instance\, in finite density QCD at low
temperature and high density\, exotic fermion condensates are conjectured
to form due to such effects. When one applies the complex Langevin method
to such a complex action system naively\, one cannot obtain the correct r
esults because of the singular-drift problem associated with the appearanc
e of small eigenvalues of the Dirac operator. Here we propose to add a fer
mion bilinear term to the action to avoid this problem and extrapolate its
coefficient to zero. We test this idea in an SO(4)-invariant matrix model
with a Gaussian action and a complex fermion determinant\, whose phase is
expected to induce the spontaneous breaking of the SO(4) symmetry. Our re
sults agree well with the previous results obtained by the Gaussian expans
ion method.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2
532/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2532/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Hadronic Vacuum Polarisation contribution to the anomalous mag
netic moment of the muon
DTSTART;VALUE=DATE-TIME:20160726T180000Z
DTEND;VALUE=DATE-TIME:20160726T190000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2531@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Christine Davies (University of Glasgow)\nWe report
on the HPQCD calculation of the u/d HVP contribution to a_mu\, discussed i
n arXiv:1601.03071. This allows us to obtain a total HVP contribution from
u\, d\, s and c quarks and including an estimate of disconnected pieces a
nd QED and isospin effects of 666(6)(12) x 10^{-10}.\nOur result implies a
discrepancy between the experimental determination of a_mu and the Standa
rd Model of 3 sigma. \nWe discuss prospects for improvements to this calcu
lation underway with the \nMILC and Fermilab Lattice Collaborations.\n\nht
tps://conference.ippp.dur.ac.uk/event/470/contributions/2531/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2531/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Temperature dependence of topological susceptibility using gradien
t flow
DTSTART;VALUE=DATE-TIME:20160729T161000Z
DTEND;VALUE=DATE-TIME:20160729T163000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2530@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Yusuke Taniguchi (University of Tsukuba)\nTopologica
l susceptibility brings important information of the QCD vacuum and\ncontr
ibutes to a production of the axion. The temperature dependence of the top
ological susceptibility plays a crucial role in its production rate in the
early universe.\nIt is a test whether the axion can be an appropriate can
didate of the dark matter.\nIn this talk we report our recent study on the
topological susceptibility in the finite temperature QCD with Nf=2+1 flav
ors.\nThe topological susceptibility is given by applying the gradient flo
w to the finite temperature system. We cover a wide range of temperature r
egion $174\\le T\\le697$ MeV.\nThe ud quark mass is rather heavy $m_\\pi/m
_\\rho=0.63$ and s quark mass is\nset to almost the physical value.\n\nhtt
ps://conference.ippp.dur.ac.uk/event/470/contributions/2530/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2530/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Electromagnetic pion form factor near physical point in $N_f=2+1$
lattice QCD
DTSTART;VALUE=DATE-TIME:20160729T134000Z
DTEND;VALUE=DATE-TIME:20160729T140000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2529@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Junpei Kakazu (University of Tsukuba)\nWe present pr
eliminary result of the electromagnetic form factor of the pion\nat $m_\\p
i=0.145$ GeV on the large volume corresponding to $L = 8.1$ fm\nusing stou
t-smearing Wilson clover quark action and Iwasaki\ngauge action at $a^{-1}
=2.333$ GeV. The mean square charge radius\nis estimated from the results
at small space-like momentum transfer\nwith the NLO formula in SU(2) chira
l perturbation theory.\nOur preliminary result of the charge radius is com
pared with the experiment\nand previous lattice calculations.\n\nhttps://c
onference.ippp.dur.ac.uk/event/470/contributions/2529/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2529/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Discrete $\\beta$-function of the SU(3) gauge theory with 10 massl
ess domain-wall fermions
DTSTART;VALUE=DATE-TIME:20160726T142000Z
DTEND;VALUE=DATE-TIME:20160726T144000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2528@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Ting-Wai Chiu (National Taiwan University)\nI presen
t the updated results of the discrete $\\beta$-function of the $SU(3)$ gau
ge theory with $N_f=10$ massless optimal domain-wall fermions in the funda
mental representation.\nThe renormalized coupling is obtained by the finit
e-volume gradient flow scheme on $ L^4 $ lattices\, for seven lattice size
s: $ L/a = 8\, 10\, 12\, 16\, 20\, 24\, 32 $\; \nand each with $11 - 17$ d
ifferent lattice spacings parametrized by $ 6/g_0^2 $.\nThe discrete $\\be
ta$-function is extrapolated to the continuum limit \nusing four lattice p
airs $(L\, 2L)/a =(8\, 16)\, (10\, 20)\, (12\, 24)$ and $(16\,32)$.\nThis
provides stronger evidence of the infrared fixed point at $ g_c^2 \\simeq
7 $\, \nwhich was first reported in arXiv:1603.08854\, based on the conti
nuum extrapolation \nof the discrete $\\beta$-function obtained with three
lattice pairs.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributio
ns/2528/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2528/
END:VEVENT
BEGIN:VEVENT
SUMMARY:dark matter from one-flavor SU(2) gauge theory
DTSTART;VALUE=DATE-TIME:20160727T105000Z
DTEND;VALUE=DATE-TIME:20160727T111000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2527@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Randy Lewis (York University)\nSU(2) gauge theory wi
th a single fermion in the fundamental representation is a minimal non-Abe
lian candidate for the dark sector. Having only a single flavor provides
a natural mechanism for stabilizing dark matter on cosmological timescales
. Preliminary lattice results will be presented and discussed in the cont
ext of dark matter phenomenology.\n\nhttps://conference.ippp.dur.ac.uk/eve
nt/470/contributions/2527/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2527/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A study of the radiative transition $\\pi \\pi \\to \\pi \\gamma^{
\\ast}$ with lattice QCD
DTSTART;VALUE=DATE-TIME:20160729T165000Z
DTEND;VALUE=DATE-TIME:20160729T171000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2526@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Luka Leskovec (University of Arizona)\nLattice QCD c
alculations of radiative transitions between hadrons have in the past been
limited to processes of hadrons stable under the strong interaction. Rece
ntly developed methods for $1 \\to 2$ transition matrix elements in a fini
te volume now enable the determination of radiative decay rates of strongl
y unstable particles. Our lattice QCD study focuses on the process $\\pi \
\pi \\to \\pi \\gamma^{\\ast}$\, where the $\\rho$ meson is present as an
enhancement in the cross-section. We use 2+1 flavors of clover fermions\,
initially at a pion mass of approximately 320 MeV and a lattice size of ap
proximately 3.6 fm. The required 2-point and 3-point correlation functions
are constructed from a set of forward\, sequential and stochastic light q
uark propagators. In addition to determining the $\\rho$ meson resonance p
arameters via the Lüscher method\, the scattering phase shift is used in
concert with the $1 \\to 2$ transition matrix element formalism of Briceñ
o et al. to compute the $\\pi \\pi \\to \\pi \\gamma^{\\ast}$ amplitude at
several values of the momentum transfer and $\\pi\\pi$ invariant mass.\n\
nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2526/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2526/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Infrared properties of a prototype pNGB model for beyond-SM physic
s
DTSTART;VALUE=DATE-TIME:20160725T133500Z
DTEND;VALUE=DATE-TIME:20160725T135500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2525@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Anna Hasenfratz (University of Colorado)\nWe constru
ct a prototype BSM model where the Higgs boson is a pseudo\nNambu-Goldston
e boson by combining 4 light (massless) flavors and 8\nheavy flavors. In t
he infrared\, the SU(4) chiral symmetry is spontaneously broken \, while i
n the ultraviolet it exhibits the properties of the $N_f=12$ conformal fix
ed point. The running coupling of this system ``walks" and the energy rang
e of walking can be tuned by the mass of the heavy flavors. At the same ti
me\, renormalization group considerations predict the spectrum of such a s
ystem to show hyperscaling i.e. hadron masses in units of $F_\\pi$ are ind
ependent of the heavy mass. Hyperscaling is present for bound states made-
up of light\, heavy\, or heavy and light flavors. This observation is supp
orted by numerical observations and makes the model strongly predictive.\n
\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2525/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2525/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Equation of state in (2+1)-flavor QCD with gradient flow
DTSTART;VALUE=DATE-TIME:20160727T103000Z
DTEND;VALUE=DATE-TIME:20160727T105000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2524@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Kazuyuki Kanaya (CiRfSE\, Univ. Tsukuba)\nThe energy
-momentum tensor and the equation of state are studied in finite-temperatu
re (2+1)-flavor QCD with improved Wilson quarks\, using the gradient flow
method proposed by Makino and Suzuki. Although the up and down quarks are
heavy yet ($m_{\\rm PS}/m_V \\approx 0.63$)\, we obtain reasonable results
\, suggesting that the method works well. We also report on the results on
the chiral condensate and its susceptibility with the gradient flow metho
d.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2524/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2524/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sign problem in heavy-dense QCD from a density-of-states perspecti
ve
DTSTART;VALUE=DATE-TIME:20160726T134000Z
DTEND;VALUE=DATE-TIME:20160726T140000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2523@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Nicolas Garron (PU)\nWe investigate QCD at finite de
nsities of heavy quarks from a density-of-state perspective. Using the LLR
approach\, we can compute the phase-factor expectation value in the stron
g sign problem regime with unprecedented precision due to its inherent exp
onential error suppression. \nWe use our findings to draw conclusions on
the approach using phase cumulants.\n\nhttps://conference.ippp.dur.ac.uk/e
vent/470/contributions/2523/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2523/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Calculation of hadronic matrix elements contributing to the $B_s-\
\bar{B}_s$ width difference
DTSTART;VALUE=DATE-TIME:20160727T094000Z
DTEND;VALUE=DATE-TIME:20160727T100000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2522@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Matthew Wingate (University of Cambridge)\nThe width
difference $\\Delta \\Gamma_s$ is one of three observables\,\nalong with
the mass splitting $\\Delta M_s$ and the semileptonic CP\nasymmetry $a^s_{
\\mathrm{SL}}$\, whose measurements completely constrain\nthe physics of $
B_s-\\bar{B}_s$ oscillations. One of the\ndominant uncertainties in theor
etical calculations of the width\ndifference is due to not knowing matrix
elements of dimension-7\noperators beyond the vacuum saturation approximat
ion. In particular\, \nprogress requires a first-principles calculation of
the matrix element of\n$R_2$\, a $\\Delta B = 2$ operator with a derivati
ve acting on the\nstrange quark field. We discuss our methodology and pre
sent\npreliminary results of a calculation of $\\langle B_s | R_2 |\n\\bar
{B}_s\\rangle$ using nonrelativistic $b$ quarks and highly-improved\nstagg
ered $s$ quarks on the MILC Collaboration's $n_f = 2+1+1$\nconfigurations.
\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2522/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2522/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The large $N$ limit of the topological susceptibility of Yang-Mill
s gauge theory
DTSTART;VALUE=DATE-TIME:20160729T132000Z
DTEND;VALUE=DATE-TIME:20160729T134000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2521@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Miguel Francisco Garcia Vera (NIC\, DESY & Humboldt
Universitat zu Berlin)\nWe present a precise computation of the topologica
l susceptibility $\\chi$ of SU($N$) Yang–Mills theory in the large-$N$ l
imit. The computation is done on the lattice\, using high-statistics Monte
Carlo simulations of the SU($N$) Yang-Mills theories\, with $N=3\, 4\, 5\
, 6$ and three different lattice spacings. Two major improvements allowed
us to go to finer lattice spacing and larger $N$ compared to previous work
s. First\, the topological charge is implemented through the gradient flow
definition\; and second\, open boundary conditions in the time direction
are employed in order to avoid the freezing of the topological charge. Our
results allow us to extrapolate the dimensionless quantity $t_0^2\\chi$ t
o the continuum and large-$N$ limits with confidence. The accuracy of our
final result represents a new quality in the verification of large-$N$ sca
ling.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2521/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2521/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hindered M1 Radiative Decays
DTSTART;VALUE=DATE-TIME:20160725T170500Z
DTEND;VALUE=DATE-TIME:20160725T172500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2520@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Ciaran Hughes (University of Cambridge)\nThroughout
the literature\, phenomenological models have been unsuccessful in pinning
down the heavy quarkonia hindered M1 radiative transitions (i.e.\, those
radiative transitions between states with different principal quantum numb
ers that require one of the quarks to flip-spin) and yield predictions tha
t are spread over a vast range.\n\nIn this talk\, we will learn how to acc
urately and precisely predict these classes of decays by utilising lattice
NRQCD\, compare to the phenomenological calculations\, and then show how
this work is relevant for the experimental hyperfine splitting.\n\nhttps:/
/conference.ippp.dur.ac.uk/event/470/contributions/2520/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2520/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Determination of chiral condensate from low-lying eigenmodes of Mo
bius domain-wall Dirac operator
DTSTART;VALUE=DATE-TIME:20160725T141500Z
DTEND;VALUE=DATE-TIME:20160725T143500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2519@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Shoji Hashimoto (KEK)\nWe calculate the spectral fun
ction of the Mobius domain-wall Dirac operator utilizing a stochastic eige
nvalue counting technique. From the low-end of the spectrum we extract the
chiral condensate in 2+1-flavor QCD\, and take the chiral and continuum l
imits. Lattice ensembles are those generated with Mobius domain-wall fermi
ons at a~0.080\, 0.055 and 0.044 fm.\n\nhttps://conference.ippp.dur.ac.uk/
event/470/contributions/2519/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2519/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Leading electromagnetic corrections to meson masses and the HVP
DTSTART;VALUE=DATE-TIME:20160726T142000Z
DTEND;VALUE=DATE-TIME:20160726T144000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2518@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Vera Guelpers (University of Southampton)\nWe presen
t a strategy to calculate the leading order electromagnetic corrections to
meson masses and the hadronic vacuum polarization. These corrections are
computed directly through a QED perturbative expansion of the QCD+QED corr
elation functions. We will show some first results obtained using $N_f=2+1
$ Domain Wall fermions. This calculation will be directly compared to the
stochastic approach presented by James Harrison.\n\nhttps://conference.ipp
p.dur.ac.uk/event/470/contributions/2518/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2518/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Semi-leptonic $B$ decays with charming final state
DTSTART;VALUE=DATE-TIME:20160727T092000Z
DTEND;VALUE=DATE-TIME:20160727T094000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2517@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Oliver Witzel (University of Edinburgh)\nFirst resul
ts for our calculation of semi-leptonic $B$ decays with charmed-mesons in
the final state are presented. Our work is based on RBC-UKQCD's 2+1 flavor
domain-wall fermion and Iwasaki gauge field configurations\, We calculate
the form factors by simulating the $b$ quarks using the relativistic heav
y quark action\, create light $u/d$ and $s$ quarks with standard domain-wa
ll kernel\, and use optimised Möbius domain-wall fermions for charm quark
s.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2517/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2517/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Up and down quark masses and corrections to Dashen's theorem from
lattice QCD and quenched QED
DTSTART;VALUE=DATE-TIME:20160726T142000Z
DTEND;VALUE=DATE-TIME:20160726T144000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2516@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Lukas Varnhorst (University of Wuppertal)\nWe presen
t a determination of the corrections to Dashen's theorem and of the indivi
dual up and down quark masses from a lattice calculation based on quenched
QED and $N_f=2+1$ QCD simulations with 5 lattice spacings down to $0.054
\\\, \\mbox{fm}$. The simulations feature lattice sizes up to $6 \\\, \\mb
ox{fm}$ and average up-down quark masses all the way down to their physica
l value. For the parameter which quantifies violations to Dashens's theore
m we obtain $\\epsilon=0.73(2)(5)(17)$\, where the first error is statisti
cal\, the second is systematic\, and the third is an estimate of the QED q
uenching error. For the light quark masses we obtain\, $m_u=2.27(6)(5)(4)
\\ \\mbox{MeV}$ and $m_d=4.67(6)(5)(4) \\\, \\mbox{MeV}$ in the $\\bar{MS}
$ scheme at $2 \\\, \\mbox{GeV}$ and the isospin breaking ratios $m_u/m_d=
0.485(11)(8)(14)$\, $R=38.2(1.1)(0.8)(1.4)$ and $Q=23.4(0.4)(0.3)(0.4)$. O
ur results exclude the $m_u=0$ solution to the strong CP problem by more t
han 24 standard deviations.\n\nhttps://conference.ippp.dur.ac.uk/event/470
/contributions/2516/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2516/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Prediction of positive parity Bs mesons and search for the X(5568)
DTSTART;VALUE=DATE-TIME:20160726T190000Z
DTEND;VALUE=DATE-TIME:20160726T200000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2515@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Daniel Mohler (Helmholtz-Institut Mainz)\nWe use a c
ombination of quark-antiquark and $B^{(*)}K$ interpolating fields to predi
ct the mass of two QCD bound states below the $B^*K$ threshold in the\nqua
ntum channels $J^P=0^+$ and $1^+$. The mesons correspond to the b-quark co
usins of the $D_{s0}^*(2317)$ and $D_{s1}(2460)$ and have not yet been obs
erved in experiment\, even though they are expected to be found by LHCb.\
nIn addition to these predictions\, we obtain excellent agreement of the r
emaining p-wave energy levels with the known $B_{s1}(5830)$ and $B_{s2}^*(
5840)$ mesons. The results from our first principles calculation are compa
red to previous model-based estimates. More recently the D0 collaboration
claimed the existence of an exotic resonance $X(5568)$ with exotic flavor
content $\\bar{b}s\\bar{d}u$. If such a state with $J^P=0^+$ exists\, only
the decay into $B_s\\pi$ is open which makes a lattice search for this st
ate much cleaner and simpler than for other exotic candidates involving he
avy quarks. We conclude\, however\,\n that we do not find such a candidate
in agreement with a recent LHCb result.\n\nhttps://conference.ippp.dur.ac
.uk/event/470/contributions/2515/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2515/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice QCD searches for tetraquarks containing charm quarks
DTSTART;VALUE=DATE-TIME:20160725T135500Z
DTEND;VALUE=DATE-TIME:20160725T141500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2514@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Gavin Cheung (University of Cambridge)\nWe present s
earches for tetraquarks in lattice QCD with quark content $cc\\bar{q}\\bar
{q}$ and isospin-1 $c\\bar{c}q\\bar{q}$ which are especially of relevance
to the experimentally observed charged $Z_c$ states. Utilising the variati
onal method\, we employ a large bases of operators consisting of diquark-a
ntidiquark and meson-meson operators. We show the spectra determined acros
s a range of channels. We discuss extending our study to the isospin-0 $c\
\bar{c}q\\bar{q}$ sector.\n\nhttps://conference.ippp.dur.ac.uk/event/470/c
ontributions/2514/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2514/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Disconnected and light connected HVP contributions to the muon ano
malous magnetic moment
DTSTART;VALUE=DATE-TIME:20160726T130000Z
DTEND;VALUE=DATE-TIME:20160726T132000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2513@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Christoph Lehner (BNL)\nI present our recent results
for the disconnected HVP contribution and report the current status of ou
r light connected HVP contribution to the muon anomalous magnetic moment.\
n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2513/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2513/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Strings on the lattice and AdS/CFT
DTSTART;VALUE=DATE-TIME:20160729T163000Z
DTEND;VALUE=DATE-TIME:20160729T165000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2512@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Valentina Forini (Humboldt University Berlin)\nStrin
g sigma-models relevant in AdS/CFT are highly non-trivial two-dimensional
field theories whose perturbative analysis is being crucially used to ver
ify various conjectures\, among which their integrability. I will discuss
significant progress on how to address the extraction of information at fi
nite values of the string effective tension via the use of lattice-based m
ethods.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2512/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2512/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Retrieving the optical potential from a Lattice simulation.
DTSTART;VALUE=DATE-TIME:20160726T132000Z
DTEND;VALUE=DATE-TIME:20160726T134000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2511@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Maxim Mai (George Washington University)\nWe propose
a method for the direct extraction of the complex hadron-hadron optical p
otential (or\, equivalently\, the phase shift and inelasticity in a given
channel) on the lattice\, which does not require the use of the multi-chan
nel Lüscher formalism\, but the knowledge of a tower of energy levels onl
y.\n\nThe approach works for any multi-particle states and tested explicit
ly on a set of synthetic data for the $\\pi\\eta-K\\bar K$ system. Further
\, we show how a sufficiently large number of energy eigenvalues can be ob
tained utilizing partial twisting.\n\nhttps://conference.ippp.dur.ac.uk/ev
ent/470/contributions/2511/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2511/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Monte Carlo methods in continuous time for lattice Hamiltonians
DTSTART;VALUE=DATE-TIME:20160726T155000Z
DTEND;VALUE=DATE-TIME:20160726T161000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2510@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Emilie Huffman (Duke University)\nWe solve a variety
of sign problems for models in lattice field theory using the Hamiltonian
formulation\, including Yukawa models and simple lattice gauge theories.
The solutions emerge naturally in continuous time and use the dual represe
ntation for the bosonic fields. These solutions allow us to construct quan
tum Monte Carlo methods for these problems. The methods could provide an a
lternative approach to understanding non-perturbative dynamics of some lat
tice field theories.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contri
butions/2510/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2510/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Effective action for pions and a dilatonic meson - foundations
DTSTART;VALUE=DATE-TIME:20160725T160500Z
DTEND;VALUE=DATE-TIME:20160725T162500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2509@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Yigal Shamir (Tel Aviv University)\nRecent simulatio
ns suggest the existence of a very light singlet scalar\nin QCD-like theor
ies that may be lying just outside the conformal window.\nAssuming that th
e lightness of this scalar can be explained by an\napproximate dilatation
symmetry\, we develop an effective field theory\nframework for both the pi
ons and this light scalar\, the "dilatonic meson."\nWe argue that a power
counting exists that puts this effective field theory\non a systematic foo
ting.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2509/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2509/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quark orbital dynamics in the nucleon - from Ji to Jaffe-Manohar o
rbital angular momentum
DTSTART;VALUE=DATE-TIME:20160725T135500Z
DTEND;VALUE=DATE-TIME:20160725T141500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2508@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Michael Engelhardt (New Mexico State University)\nQu
ark orbital angular momentum (OAM) in the nucleon can be evaluated\ndirect
ly by employing a Wigner function embodying the simultaneous\ndistribution
of parton transverse position and momentum. This\ndistribution can be acc
essed via a generalization of the nucleon\nmatrix elements of quark biloca
l operators which have been used\npreviously in the lattice evaluation of
transverse momentum\ndependent parton distributions (TMDs). By supplementi
ng these matrix\nelements with a nonzero momentum transfer\, mixed transve
rse position\nand momentum information is generated. In the quark bilocal
operators\,\na gauge connection between the quarks must be specified\; a s
taple-shaped\ngauge link path\, as used in TMD calculations\, yields Jaffe
-Manohar OAM\,\nwhereas a straight path yields Ji OAM. A lattice calculati
on at a pion\nmass of 518 MeV is presented which demonstrates that the dif
ference\nbetween Ji and Jaffe-Manohar OAM can be clearly resolved. The obt
ained\nJi OAM is confronted with traditional evaluations utilizing Ji's su
m\nrule. Jaffe-Manohar OAM is enhanced in magnitude compared to Ji OAM.\n\
nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2508/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2508/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Critical endline of the finite temperature phase transition for 2+
1 flavor QCD around the SU(3)-flavor symmetric point
DTSTART;VALUE=DATE-TIME:20160725T143500Z
DTEND;VALUE=DATE-TIME:20160725T145500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2507@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Yoshifumi Nakamura (RIKEN)\nWe investigate the criti
cal endline of the finite temperature phase transition of QCD around the
SU(3)-flavor symmetric point at zero chemical potential.\nWe employ the re
normalization-group improved Iwasaki gauge action and non-perturbatively $
O(a)$-improved Wilson-clover fermion action.\nThe critical endline is det
ermined by using the intersection point of kurtosis\, employing the multi-
parameter\, multi-ensemble reweighting method to calculate observables off
the SU(3)-symmetric point\, at the temporal size $N_{\\rm T}$=6 and latt
ice spacing as low as $a \\approx 0.19$ fm.\nWe confirm that the slope of
the critical endline takes the value of $-2$\, and find that the second
derivative is positive\, at the SU(3)-flavor symmetric point on the Columb
ia plot parametrized with the strange quark mass $m_s$ and degenerated up-
down quark mass $m_{\\rm l}$.\n\nhttps://conference.ippp.dur.ac.uk/event/4
70/contributions/2507/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2507/
END:VEVENT
BEGIN:VEVENT
SUMMARY:New Noise Subtraction Methods in Lattice QCD
DTSTART;VALUE=DATE-TIME:20160726T190000Z
DTEND;VALUE=DATE-TIME:20160726T200000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2506@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Suman Baral (Baylor University)\nLattice QCD calcula
tions of quark loop operators are extremely time-consuming to evaluate. To
calculate these diagrams we use stochastic noise methods\, which employ a
randomly generated set of noise vectors to project out physical signals.
This is done with linear equation solvers like GMRES-DR (Generalized Minim
um RESidual algorithm-Deﬂated and Restarted) for the ﬁrst noise\, and
GMRES-Proj (similar algorithm projected over eigenvectors) for remaining n
oises. In this context\, we are attempting to employ matrix deﬂation alg
orithms to reduce statistical uncertainty in these time-consuming lattice
calculations. In addition\, we are developing noise suppression algorithms
using polynomial subtraction techniques\, as well as combining deﬂation
and polynomial methods in an original way.\n\nhttps://conference.ippp.dur
.ac.uk/event/470/contributions/2506/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2506/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A method to compute derivatives of functions of large complex matr
ices
DTSTART;VALUE=DATE-TIME:20160727T111000Z
DTEND;VALUE=DATE-TIME:20160727T113000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2505@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Matthias Puhr (University of Regensburg)\nWe present
a method for the numerical calculation of derivatives of\nfunctions of ge
neral complex matrices which also works for implicit\nmatrix function appr
oximations such as Krylov-Ritz type algorithms. An\nimportant use case fo
r the method is the overlap Dirac operator at\nfinite quark chemical poten
tial. The evaluation of the overlap Dirac\noperator at finite chemical pot
ential calls for the computation of the\nproduct of the sign function of a
non-Hermitian matrix with some source\nvector. For non-Hermitian matrices
the sign function can no longer be\nefficiently approximated with polyno
mials or rational functions.\nInstead one invokes implicit approximation a
lgorithms\, like Krylov-Ritz\nmethods\, that depend on the source vector.
Our method allows for an\nefficient calculation of the derivatives of such
implicit\napproximations\, which is necessary for the computation of cons
erved\nlattice currents or the fermionic force in Hybrid Monte-Carlo or\nL
angevin simulations. We also give an explicit deflation prescription for t
he case when one\nknows several eigenvalues and eigenvectors of the matrix
being the argument\nof the differentiated function. To show that the meth
od is efficient and well\nsuited for practical calculations we provide tes
t results for the\ntwo-sided Lanczos approximation of the finite-density o
verlap Dirac\noperator on $SU(3)$ gauge field configurations on lattices w
ith sizes up\nto $ 14\\times14^3 $\n\nhttps://conference.ippp.dur.ac.uk/ev
ent/470/contributions/2505/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2505/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Effective action for pions and a dilatonic meson - results
DTSTART;VALUE=DATE-TIME:20160725T162500Z
DTEND;VALUE=DATE-TIME:20160725T164500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2504@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Maarten Golterman (San Francisco State University)\n
We consider applications of a recently developed effective field theory\nf
or a dilatonic meson and pions. We contrast the leading-order behavior\n
of masses with that in a theory with only pions\, comment on\nnext-to-lead
ing order\, and argue that the effective theory breaks down at\nthe sill o
f the conformal window\, as it should.\n\nhttps://conference.ippp.dur.ac.u
k/event/470/contributions/2504/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2504/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Phenomenology of a composite Higgs model: lessons for the lattice.
DTSTART;VALUE=DATE-TIME:20160728T130000Z
DTEND;VALUE=DATE-TIME:20160728T132000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2503@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Luigi Del Debbio (Edinburgh)\nWe study the phenomeno
logy of a specific model of strongly interacting dynamics beyond the Stand
ard Model\, and derive the current bounds on the low-energy constants that
describe the large-distance behaviour of the model. \n\nWe deduce from th
ese bounds the required accuracy for lattice simulations to have an impact
on searches for new physics beyond the Standard Model.\n\nhttps://confere
nce.ippp.dur.ac.uk/event/470/contributions/2503/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2503/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Phase diagram of the O(3) model from dual lattice simulations
DTSTART;VALUE=DATE-TIME:20160727T111000Z
DTEND;VALUE=DATE-TIME:20160727T113000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2502@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Falk Bruckmann (University of Regensburg)\nWe simula
ted the asymptotically free two-dimensional O(3) model at nonzero chemical
potential through dual variables free of the sign problem. The system und
ergoes a quantum phase transition when mu reaches the particle mass (gener
ated dynamically similar to QCD). The density follows a square root univer
sal for repulsive bosons in one spatial dimension. We have also measured t
he spin stiffness\, known to be sensitive to the spatial correlation lengt
h\, in different scaling trajectories to zero temperature and infinite siz
e. It points to a dynamical critical exponent z=2\, which can be explained
by particle worldlines. Comparisons to thermodynamic Bethe ansaetze are s
hown as well.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions
/2502/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2502/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Momentum smearing
DTSTART;VALUE=DATE-TIME:20160726T190000Z
DTEND;VALUE=DATE-TIME:20160726T200000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2501@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Bernhard Lang (University Regensburg)\nHadrons in la
ttice QCD are usually created employing smeared interpolators.\n\nWe intro
duce a new quark smearing that allows us to maintain small statistical err
ors\n\nand good overlaps of hadronic wavefunctions with the respective gro
und states\, also\n\nat high spatial momenta. We test this method for vari
ous physical observables see\n\nalso arXiv:1602.05525v2 [hep-lat].\n\nhttp
s://conference.ippp.dur.ac.uk/event/470/contributions/2501/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2501/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hierarchically deflated conjugate residua
DTSTART;VALUE=DATE-TIME:20160726T180000Z
DTEND;VALUE=DATE-TIME:20160726T190000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2500@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Azusa Yamaguchi (Software Architect)\, Peter Boyle (
University of Edinburgh)\nHierarchically deflated conjugate residual\n\nWe
present a new class of multigrid solver algorithm suitable for the soluti
on of 5d chiral fermions such as Domain Wall fermions\nand the Continued F
raction overlap. Unlike HDCG \\cite{arXiv:1402.2585}\, the algorithm\nwork
s directly on a nearest neighbour fine operator. The fine operator used is
Hermitian indefinite\, for example $\\Gamma_5 D_{dwf}$\,\nand convergence
is achieved with an indefinite matrix solver such as outer iteration base
d on conjugate residual.\nAs a result coarse space representations of the
operator remain nearest neighbour\, giving an 8 point stencil rather than
the 81 point stencil used in HDCG.\nIt is hoped this may make it viable to
recalculate the matrix elements of the little Dirac operator in an HMC ev
olution.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2500
/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2500/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Rho Resonance from Twisted Mass Lattice QCD
DTSTART;VALUE=DATE-TIME:20160726T130000Z
DTEND;VALUE=DATE-TIME:20160726T132000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2499@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Markus Werner (University of Bonn)\nWe present new r
esults for $I=1 \\ \\pi\\pi$ scattering with twisted mass fermions utilizi
ng\nthe sLapH method. The breaking of rotational symmetry on the lattice i
s fully taken\ninto account at multiple moving frames. Our previous calcul
ation is\nextended by more single and multi-hadron operators and by utilis
ing more\nirreducible representations.\n\nhttps://conference.ippp.dur.ac.u
k/event/470/contributions/2499/
LOCATION:Highfield Campus\, University of Southampton Bulding B2a Room 206
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2499/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Simulations of N=1 supersymmetric Yang-Mills theory with three col
ours
DTSTART;VALUE=DATE-TIME:20160726T171000Z
DTEND;VALUE=DATE-TIME:20160726T173000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2498@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: pietro giudice (University of Muenster)\nWe report o
n our recent results regarding numerical simulations of the four dimension
al\, N=1 Supersymmetric Yang-Mills theory with SU(3) gauge symmetry and li
ght dynamical gluinos.\n\nhttps://conference.ippp.dur.ac.uk/event/470/cont
ributions/2498/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2498/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Charm-strange mesons and D K scattering
DTSTART;VALUE=DATE-TIME:20160728T142000Z
DTEND;VALUE=DATE-TIME:20160728T144000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2497@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Christopher Thomas (University of Cambridge)\nI will
discuss a recent lattice QCD investigation of $D$ $K$ scattering relevant
for near-threshold charm-strange mesons such as the enigmatic $D_s(2317)$
. By employing a range of techniques we extracted precise finite-volume s
pectra in a number of different channels. These were used to map out the
energy dependence of the scattering phase shift and from the singularity s
tructure of the scattering amplitude we determined the resonant and bound
state content. I will conclude with some comments on future prospects.\n\
nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2497/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2497/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thermodynamics of strongly interacting plasma with high accuracy
DTSTART;VALUE=DATE-TIME:20160729T153000Z
DTEND;VALUE=DATE-TIME:20160729T155000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2496@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Michele Pepe (INFN - Sez. Milano Bicocca - Italy)\nT
he thermodynamic properties of the $SU(3)$ Yang-Mills theory are\ninvestig
ated from the confining phase up to 250 $T_c$. Results for the\ntemperatur
e dependence of the entropy density\, energy density and pressure\nare pre
sented with an accuracy of about 0.5%. The framework of shifted\nboundary
conditions is considered where the entropy density is related to\nthe expe
ctation value of the off-diagonal components of the\nenergy-momentum tenso
r. The pressure and the energy density are then\nobtained by numerical int
egration. A comparison with data collected by\nother groups is discussed.\
n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2496/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2496/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice simulations of vector mesons in strong magnetic field
DTSTART;VALUE=DATE-TIME:20160729T161000Z
DTEND;VALUE=DATE-TIME:20160729T163000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2495@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Olga Soloveva (Institute for Theoretical and Experim
ental Physics &\; National Research Nuclear University MEPhI (Moscow En
gine ering Physics Institute))\nWe have explored ground state energies of
the light vector mesons on the base of the $SU(3)$ lattice gauge theory.
This study was performed without dynamical quarks. We have observed the en
ergies spliting depending on the value of the spin projections on an exter
nal magnetic field. The ground state energy of neutral mesons with the $s_
z = 0$ diminishes with the increase of the field\, while the energy of cha
rged one increases according to the theoretical expectation. The neutral m
esons energies with non-zero spins $s_z = −1$ and $+1$ increase with the
value of the magnetic field. \nThe Landau level describes the energy of a
charged point-like particle in a magnetic field \, while in our calculat
ions we took into account the quark structure of a particle and introduce
d the term with magnetic polarizability:\n\\begin{equation}\nE^2=p^2_z+m^2
+|qH|-gs_zqH-4\\pi m \\beta_m H^2\, \\ \\ H=eB\,\n\\end{equation}\nwhere $
E$ is the ground state energy of a particle\, $g$ is the magnetic dipole
moment of the particle in\n$\\frac{e}{2m_\\rho}$ units\, $q$ is its charge
\, $m=E(H=0)$ is the mass of the particle\, $s_z$ is the spin projection
on the external magnetic field\, $\\beta$ is the magnetic polarizability.
We have observed the agreement of the Landau level picture with our data
for the magnetic field values below $0.6 \\ GeV^2$. \n\nThe background mag
netic field enables to calculate the magnetic polarizabilities and the mag
netic dipole moments of the hadrons. We measured the energy of a meson as
a function of the uniform abelian field. \nIn our calculations external ma
gnetic field is constant and it's values vary from $0$ up to $2.5 \\ GeV^
2$. The magnetic dipole moment of the charged ρ meson has been defined f
or various quark masses more precisely then in our previous work. This val
ue is in good agreement with the experimentally obtained value. We have a
lso estimated the magnetic dipole moment of the $K^*$ meson.\n\nThe study
of the internal structure of hadrons in external fields is important and
relevant in connection with ongoing experiments at JLAB\, CERN(COMPASS)\,
SLAC. Currently there exist significant discrepancies between the theoreti
cal predictions\, different phenomenological models and experimentally obt
ained data. For most mesons the magnetic polarizability and g-factor has
not been found experimentally yet. There still exist large uncertainties i
n determination of the electric and magnetic polarizabilities. According t
o the chiral perturbation theory magnetic and electric polarizabilities ar
e interrelated\, what stresses the importance of calculating magnetic pol
arizability.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/
2495/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2495/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Testing the hadro-quarkonium model on the lattice
DTSTART;VALUE=DATE-TIME:20160725T164500Z
DTEND;VALUE=DATE-TIME:20160725T170500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2494@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Francesco Knechtli (University of Wuppertal)\nRecent
ly the LHCb experiment found evidence for the existence of two\nexotic res
onances consisting of $c\\bar{c}uud$ quarks. Among the possible\ninterpret
ations there is the hadro-charmonium model\, in which charmonium\nis bound
"within" a hadron. We test this idea on CLS $n_f$=2+1 lattices\nusing the
static formulation for the heavy quarks. We find that the\nstatic potenti
al is modified by the presence of a hadron. It becomes\nmore attractive an
d the effect is of the order of few MeV.\n\nhttps://conference.ippp.dur.ac
.uk/event/470/contributions/2494/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2494/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Computing the static potential using non-string-like trial states
DTSTART;VALUE=DATE-TIME:20160725T162500Z
DTEND;VALUE=DATE-TIME:20160725T164500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2493@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Tobias Neitzel (Goethe University Frankfurt)\nWe pre
sent a method for computing the static quark-antiquark potential\,\nwhich
is not based on Wilson loops\, but where the trial states are\nformed by e
igenvector components of the covariant Laplace operator. We\nhave tested t
his method in SU(2) Yang-Mills theory and obtained results\nwith statistic
al errors of similar magnitude compared to a standard\nWilson loop computa
tion. The runtime of the method is\, however\,\nsignificantly smaller\, wh
en computing the static potential not only for\non-axis\, but also for man
y off-axis quark-antiquark separations\, i.e.\nwhen a fine spatial resolut
ion is required.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributi
ons/2493/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2493/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Charmed meson physics from three-flavour lattice QCD
DTSTART;VALUE=DATE-TIME:20160726T190000Z
DTEND;VALUE=DATE-TIME:20160726T200000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2492@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Kevin Eckert (WWU Muenster)\nWe report on analysis a
spects within a joint ongoing effort of the\nALPHA and RQCD Collaborations
to compute charmed meson masses and the\nleptonic decay constants $f_{{\\
rm D}}$ and $f_{{\\rm D}_{\\rm s}}$ in\n$(2+1)$-flavour lattice QCD\, empl
oying non-perturbatively O($a$) improved\nWilson quarks and the tree-level
Symanzik-improved gauge action.\nOur studies make use of large-volume CLS
configurations at two lattice\nspacings ($a\\approx 0.086\,0.064$ fm) wit
h open boundary conditions.\nIn particular\, we present our implementation
of distance preconditioning\n(as proposed by de Divitiis et al.) for the
calculation of heavy quark\npropagators and discuss the resulting accuracy
improvements of charmed\nmeson correlators and its impact on the extracti
on of charmed meson masses\nand decay constants.\n\nhttps://conference.ipp
p.dur.ac.uk/event/470/contributions/2492/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2492/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice Conformal Field theory on Curved Manifolds
DTSTART;VALUE=DATE-TIME:20160727T092000Z
DTEND;VALUE=DATE-TIME:20160727T094000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2491@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Richard Richard Brower (Boston University)\nA Quantu
m Finite Element (QFE) Lagrangian is formulated for\na general simplicial
complex approximation to a smooth Euclidean\nRiemann manifold. The constru
ction is applied to Wilson Dirac fermions\nwith the appropriate lattice sp
in connection and to phi 4th-theory\nwith QFE counter terms required for t
hese theories to converge in the\ncontinuum limit. Numerical tests are giv
en for the Wilson-Fisher\nfixed point in 2D with comparison to the exact s
olution of the Ising CFT on\nthe two sphere and for the 3D phi 4th-theory
in radial quantization.\nPotential future applications to more general 3D
conformal field theories and 4D\nBeyond the Standard Model (BSM) gauge the
ories near the conformal window are\nsuggested.\n\nhttps://conference.ippp
.dur.ac.uk/event/470/contributions/2491/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2491/
END:VEVENT
BEGIN:VEVENT
SUMMARY:D=5 Maximally Supersymmetric Yang-Mills on the Lattice
DTSTART;VALUE=DATE-TIME:20160726T165000Z
DTEND;VALUE=DATE-TIME:20160726T171000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2490@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Anosh Joseph (University of Cambridge)\nMaximally su
persymmetric Yang-Mills theory in five dimensions has generated a lot of i
nterest in the recent years. It takes part in the gauge-gravity duality an
d its finite temperature properties have been investigated recently in the
planar limit. This theory is also interesting through its conjectured rel
ationship to the six-dimensional (2\,0) theory\, which is still controvers
ial. In this talk we describe the lattice construction of D=5 maximally su
persymmetric Yang-Mills theory. The lattice theory preserves one superchar
ge exact at finite lattice spacing. This supersymmetric lattice formulatio
n can be used to explore the non-perturbative regime of the continuum targ
et theory. It would be interesting to find a nontrivial UV fixed point fro
m the lattice theory for D=5 theory since the fixed point can provide a UV
completion and non-perturbative definition of the theory.\n\nhttps://conf
erence.ippp.dur.ac.uk/event/470/contributions/2490/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2490/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Study of the sign problem in canonical approach
DTSTART;VALUE=DATE-TIME:20160727T094000Z
DTEND;VALUE=DATE-TIME:20160727T100000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2489@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Asobu Suzuki (University of Tsukuba)\nCanonical appr
oach is one of the powerful tools to approach the QCD phase diagram. We ca
lculate the canonical partition function instead of the grand canonical on
e in the canonical approach. However\, it is known that the sign problem e
merges as a complex phase of the canonical partition function.\n Thanks to
multi-precision calculations with the canonical approach we obtained the
canonical partition function even for large baryon numbers. In this talk\,
we will argue the origin of this "phase"\, and study some behavior of its
temperature and baryon number dependence.\n\nhttps://conference.ippp.dur.
ac.uk/event/470/contributions/2489/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2489/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A massive momentum-subtraction scheme
DTSTART;VALUE=DATE-TIME:20160727T092000Z
DTEND;VALUE=DATE-TIME:20160727T094000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2488@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Ava Khamseh (The University of Edinburgh)\nA new ren
ormalization scheme is defined for fermion bilinears in QCD at non vanishi
ng quark masses. This new scheme\, denoted RI/mSMOM\, preserves the benefi
ts of the nonexceptional momenta introduced in the RI/SMOM scheme\, and al
lows a definition of renormalized composite fields away from the chiral li
mit.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2488/
LOCATION:Highfield Campus\, Universit of Southampton Building 67 Room 1027
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2488/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Latest results from lattice N=4 supersymmetric Yang--Mills
DTSTART;VALUE=DATE-TIME:20160726T161000Z
DTEND;VALUE=DATE-TIME:20160726T163000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2487@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: David Schaich (Syracuse University)\nI will present
results from numerical studies of maximally supersymmetric Yang--Mills the
ory\, focusing on the scaling dimension of the Konishi operator. Working
with a lattice formulation that exactly preserves one supersymmetry at non
-zero lattice spacing\, we employ an improved action developed in 2015 tha
t dramatically reduces lattice artifacts. Using this new improved action
we are exploring a range of 't Hooft couplings for two-\, three- and four
-color gauge theories\, to bridge the perturbative regime and the onset of
strong-coupling AdS/CFT duality in the large-N limit. Among the various
quantities we are investigating the Konishi operator is particularly signi
ficant as the simplest conformal operator with a non-trivial anomalous dim
ension.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2487/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2487/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Disconnected diagrams with twisted-mass fermions
DTSTART;VALUE=DATE-TIME:20160728T163000Z
DTEND;VALUE=DATE-TIME:20160728T165000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2486@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Alejandro Vaquero (INFN Sezione Milano Bicocca)\nThe
latest results from the Twisted-Mass collaboration on disconnected diagra
ms at the physical value of the pion mass are presented. In particular\, w
e focus on the sigma terms\, the axial charges and the momentum fraction.
A detailed error analysis for each observable follows\, showing the streng
ths and weaknesses of the one-end trick. Alternatives are discussed.\n\nht
tps://conference.ippp.dur.ac.uk/event/470/contributions/2486/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2486/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tensor RG calculations and quantum simulations near criticality
DTSTART;VALUE=DATE-TIME:20160726T144000Z
DTEND;VALUE=DATE-TIME:20160726T150000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2485@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Yannick Meurice (University of Iowa)\nWe reformulate
the Ising model\, the O(2) model with a chemical potential and the Abelia
n Higgs model on a 1+1 space-time lattice using the \nTensor Renormalizati
on Group (TRG) method. The reformulation allows exact blocking and connect
s smoothly the classical Lagrangian approach to the quantum Hamiltonian ap
proach. We discuss the linearization of the TRG for the Ising model near t
he critical point. \nWe calculate the entanglement entropy in the superflu
id phase of the O(2) model and show that it obeys the Cardy scaling (c/3)
*Ln(L).\nWe calculate the Polyakov loop in the Abelian Higgs model and dis
cuss the possibility of a deconfinement transition at finite volume. \nWe
propose Bose-Hubbard Hamiltonians with two species implementable on optica
l lattices as quantum simulators.\n\nhttps://conference.ippp.dur.ac.uk/eve
nt/470/contributions/2485/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2485/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Position-space approach to hadronic light-by-light scattering in t
he muon $g-2$ on the lattice
DTSTART;VALUE=DATE-TIME:20160726T144000Z
DTEND;VALUE=DATE-TIME:20160726T150000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2484@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Nils Asmussen (Institut für Kernphysik\, Johannes G
utenberg-Universität Mainz)\nThe anomalous magnetic moment of the muon cu
rrently shows a more than $3\\sigma$ discrepancy between the experimental
value and recent Standard Model predictions. The theoretical uncertainty i
s dominated by the hadronic vacuum polarization and the hadronic light-by-
light (HLbL) scattering contributions\, where the latter has so far only b
een fully evaluated using different models. To pave the way for a lattice
calculation of HLbL\, we present an expression for the HLbL contribution t
o $g-2$ that involves a multidimensional integral over a position-space QE
D kernel function in the continuum and a lattice QCD four-point correlator
. We describe our semi-analytic calculation of the kernel and test the app
roach by evaluating the $\\pi^0$-pole contribution in the continuum.\n\nht
tps://conference.ippp.dur.ac.uk/event/470/contributions/2484/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2484/
END:VEVENT
BEGIN:VEVENT
SUMMARY:New extended interpolating fields for hadron correlation functions
DTSTART;VALUE=DATE-TIME:20160726T190000Z
DTEND;VALUE=DATE-TIME:20160726T200000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2483@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Francesco Scardino (University of Rome "La Sapienza"
)\nWe introduce new extended interpolating operators made of quenched thre
e\ndimensional fermions propagating in the timeslices. Such non-local\nope
rators are well behaved under renormalisation. \n\nThe mass of the three 3
D fermions can be tuned in a controlled way to\nfind a better overlap of t
he extended operators with the states of\ninterest. We test these operator
s for baryon two-point functions and\ncompare to point sources and Jacobi
smearing.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/248
3/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2483/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On the condition for correct convergence in the complex Langevin m
ethod
DTSTART;VALUE=DATE-TIME:20160726T163000Z
DTEND;VALUE=DATE-TIME:20160726T165000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2482@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Shinji Shimasaki (Keio University)\nThe complex Lang
evin method (CLM) is a promising way to perform the path integral with a c
omplex action based on a stochastic equation for complexified dynamical va
riables. It is known\, however\, that the CLM gives wrong results in some
cases\, while it works\, for instance\, in finite density QCD in the decon
finement phase or in the heavy dense limit. In this talk\, we revisit this
issue starting with a finite Langevin step-size. We find that there is a
subtlety in taking the zero step-size limit\, although the previous argume
nt used a continuous time from the beginning. Also there is a subtlety in
using the time-evolved observables\, which play a crucial role in the argu
ment. These subtleties require that the probability distribution of the dr
ift term should be suppressed exponentially at large magnitude. We demonst
rate our claim in some examples including chiral Random Matrix Theory and
show that our criterion is indeed useful in judging whether the results ob
tained by the CLM are trustable or not.\n\nhttps://conference.ippp.dur.ac.
uk/event/470/contributions/2482/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2482/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Transverse spin densities of octet baryons
DTSTART;VALUE=DATE-TIME:20160725T143500Z
DTEND;VALUE=DATE-TIME:20160725T145500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2481@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: James Zanotti (University of Adelaide)\nFourier tran
sforms of electromagnetic form factors provide valuable insights into the
spatial distribution of quarks/charge within a hadron. When combined with
form factors arising from non-forward matrix elements of the tensor operat
or\, we are able to unlock fascinating information into the distribution o
f transversely polarised/unpolarised quarks within a transversely polarise
d/unpolarised hadron. Here we present results from the QCDSF collaboration
for simulations in Nf=2+1 QCD for the form factors of the octet baryons a
nd their resulting transverse spin densities. Particular attention is paid
to SU(3) flavour breaking effects in the octet baryons as we move away fr
om the SU(3)-symmetric point towards the physical point.\n\nhttps://confer
ence.ippp.dur.ac.uk/event/470/contributions/2481/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2481/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Light-cone distribution amplitudes of the baryon octet
DTSTART;VALUE=DATE-TIME:20160725T170500Z
DTEND;VALUE=DATE-TIME:20160725T172500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2480@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Fabian Hutzler (University Regensburg)\nWe present r
esults of the first ab initio lattice QCD calculation of the normalization
constants and first moments of the leading twist distribution amplitudes
of the full baryon octet\, corresponding to the small transverse distance
limit of the associated S-wave light-cone wave functions. The P-wave (high
er twist) normalization constants are evaluated as well. The calculation i
s done using $N_f=2+1$ flavors of dynamical (clover) fermions on lattices
of different volumes and pion masses down to 222 MeV. Significant SU(3) fl
avor symmetry violation effects in the shape of the distribution amplitude
s are observed.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributio
ns/2480/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2480/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Current correlators in the coordinate space at short distances
DTSTART;VALUE=DATE-TIME:20160727T103000Z
DTEND;VALUE=DATE-TIME:20160727T105000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2479@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Masaaki Tomii (SOKENDAI)\nWe calculate the current c
orrelators in the coordinate space and compare\nthem with the experimental
information obtained through the spectral\nfunctions of hadronic tau deca
ys at ALEPH.\nLattice data are obtained with 2+1 Mobius domain-wall fermio
ns at\nthree lattice spacings 0.044\, 0.055 and 0.080 fm and the continuum
limit\nis taken.\nOn the experimental side\, there is no information for
the spectral\nfunctions above the tau lepton mass and one usually assumes
that the\nperturbation theory is applicable there.\nThrough the comparison
with the lattice data\, we are able test the\nvalidity of this quark-hadr
on duality assumption to some extent.\n\nhttps://conference.ippp.dur.ac.uk
/event/470/contributions/2479/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2479/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The DDalphaAMG solver library
DTSTART;VALUE=DATE-TIME:20160727T084000Z
DTEND;VALUE=DATE-TIME:20160727T090000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2478@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Matthias Rottmann (University of Wuppertal)\nIn this
talk we report on the publication of the DDalphaAMG solver library. We de
scribe its features\, show examples of its application and give an overvie
w of future developments.\n\nhttps://conference.ippp.dur.ac.uk/event/470/c
ontributions/2478/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2478/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$\\theta$-dependence of the massive Schwinger model
DTSTART;VALUE=DATE-TIME:20160727T105000Z
DTEND;VALUE=DATE-TIME:20160727T111000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2477@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Eduardo Royo (Universidad de Zaragoza)\nUnderstandin
g the role of the $\\theta$ parameter in QCD and its\nconnection with the
strong CP problem and axion physics is one of the\nmajor challenges for hi
gh energy theorists. Due to the sign problem\,\nat present only the QCD to
pological susceptibility is well\nknown. Using an algorithmic approach tha
t could potentially be\nextended to QCD\, we study as a first step the $\\
theta$-dependence in\nthe massive Schwinger model\, and try to verify a co
njecture of\nColeman.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contr
ibutions/2477/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2477/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Static and non-static vector screening masses
DTSTART;VALUE=DATE-TIME:20160728T144000Z
DTEND;VALUE=DATE-TIME:20160728T150000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2476@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Aman Steinberg (Uni Mainz)\nThermal screening masses
associated to the conserved vector current are calculated both in a weak-
coupling and a lattice QCD approach. The inverse of a screening mass can b
e understood as the length scale over which an external electric field is
screened in a QCD medium. The comparison of screening masses in the zero a
nd non-zero Matsubara frequency sectors shows good agreement of the pertur
bative and the lattice results. Moreover\, at *T* ≈ 508MeV the lightest
screening mass lies above the free result $(2n\\pi T)$\, in agreement with
the $\\mathcal{O}(g^2)$ weak-coupling prediction\, whereas this was not t
he case in a previous study at *T* ≈ 254MeV.\n\nhttps://conference.ippp.
dur.ac.uk/event/470/contributions/2476/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2476/
END:VEVENT
BEGIN:VEVENT
SUMMARY:An $a_0$ resonance in strongly coupled $\\pi \\eta$\, $K \\overlin
e{K}$ scattering from lattice QCD
DTSTART;VALUE=DATE-TIME:20160726T155000Z
DTEND;VALUE=DATE-TIME:20160726T161000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2475@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Jozef Dudek (Jefferson Lab)\nWe present the first ca
lculation of coupled-channel meson-meson scattering in the isospin $=1$\,
$G$-parity negative sector\, with channels $\\pi \\eta$\, $K\\overline{K}$
and $\\pi \\eta'$\, in a first-principles approach to QCD. From the discr
ete spectrum of eigenstates in three volumes extracted from lattice QCD co
rrelation functions we determine the energy dependence of the $S$-matrix\,
and find that the $S$-wave features a prominent cusp-like structure in $\
\pi \\eta \\to \\pi \\eta$ close to $K\\overline{K}$ threshold coupled wit
h a rapid turn on of amplitudes leading to the $K\\overline{K}$ final-stat
e. This behavior is traced to an $a_0(980)$-like resonance\, strongly coup
led to both $\\pi \\eta$ and $K\\overline{K}$\, which is identified with a
pole in the complex energy plane\, appearing on only a single unphysical
Riemann sheet. Consideration of $D$-wave scattering suggests a narrow tens
or resonance at higher energy.\n\nhttps://conference.ippp.dur.ac.uk/event/
470/contributions/2475/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2475/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chiral Perturbation Theory at finite volume or with twisted bounda
ry conditions
DTSTART;VALUE=DATE-TIME:20160728T130000Z
DTEND;VALUE=DATE-TIME:20160728T132000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2474@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Johan Bijnens (Lund University)\nRecent progress in
mesonic Chiral Perturbation Theory at finite volume\nand/or with twisted b
oundary conditions will be discussed. Topics include\nthe finite volume at
two-loop order calculations of masses and decay constants\nfor the pseudo
scalar of the normal case for two and three flavours [1]\,\npartially quen
ched three flavour [2] and the case for different patterns of\nspontaneous
symmetry breaking [3].\n\nTwisted boundary conditions lead to extra terms
in Ward identities and form-factors which affects finite volume correctio
ns and relations often used. This will be discussed for a number of cases\
, the older work [4] and the application to $K_{\\ell3}$ for staggered par
tially quenched [5]. Vector two-point functions relevant for the $g-2$ HVP
calculation will be treated at two-loop order [6] allowing a better estim
nate of twisting and finite volume corrections.\n\n[1] Finite Volume at tw
o-loops in Chiral Perturbation Theory\,\nJ. Bijnens and T. Rössler\,[arXi
v:1411.6384] JHEP 1501 (2015) 034\n\n[2] Finite Volume for Three-Flavour P
artially Quenched Chiral Perturbation\nTheory through NNLO in the Meson Se
ctor\,\nJ. Bijnens and T. Rössler\, [arXiv:1508.07238] JHEP 1511 (2015) 0
97\n\n[3] Finite Volume and Partially Quenched QCD-like Effective Field Th
eories\,\nJ. Bijnens and T. Rössler\, [arXiv:1509.04082] JHEP 1511 (2015)
017\n\n[4] Masses\, Decay Constants and Electromagnetic Form-factors with
\nTwisted Boundary Conditions\, J. Bijnens and J. Relefors\,\n[arXiv:1402.
1385] JHEP 05 (2014) 015\n\n[5] C. Bernard\, J. Bijnens\, E. Gamiz and J.
Relefors\, work in progress\n\n[6] J. Bijnens and J. Relefors\, work in pr
ogress\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2474/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2474/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Parity doubling of nucleons and Delta baryons across the deconfine
ment phase transition
DTSTART;VALUE=DATE-TIME:20160729T132000Z
DTEND;VALUE=DATE-TIME:20160729T134000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2473@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Davide De Boni (Swansea University)\nAt zero tempera
ture nucleons and their parity partners have non-degenerate\nmasses due to
spontaneous breaking of chiral symmetry.\nHowever\, chiral symmetry is ex
pected to be restored at sufficiently high temperature\,\nin particular wh
en going from the hadronic to the quark-gluon plasma (QGP) phase\,\nimplyi
ng that the parity partners should become degenerate.\nWe study the nucleo
n (spin 1/2) and Delta (spin 3/2) baryons in both\nparity sectors for a ra
nge of temperatures in the confined and QGP phases.\nUsing anisotropic $N_
f = 2+1$ flavour simulations\, we analyse the correlation functions and th
e spectral functions\nusing respectively exponential fits and the Maximum
Entropy Method.\nWe find a clear sign of parity doubling for both baryons
in the QGP phase:\nthe parity state masses become degenerate and\ntheir co
rresponding correlators become essentially identical.\n\nhttps://conferenc
e.ippp.dur.ac.uk/event/470/contributions/2473/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2473/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Approaching the conformal window in SU(2) field theory: a systemat
ic study of the spectrum for Nf=2\,4\,6\, and 8.
DTSTART;VALUE=DATE-TIME:20160726T190000Z
DTEND;VALUE=DATE-TIME:20160726T200000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2472@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Sara Tähtinen (University of Helsinki\, Helsinki In
stitute of Physics)\nIt is expected that SU(2) gauge theory with Nf fundam
ental fermions has an infrared fixed point when Nf is between ∼ 6 and 10
. We study the hadron spectrum and scale setting in SU(2) gauge field theo
ry with Nf = 2\,4\,6\,8 using hypercubic stout smeared Wilson-clover (HEX)
action. The case Nf = 2 is QCD-like\, Nf = 6 is close to the lower edge o
f the conformal window\, and Nf=8 is inside the conformal window. We study
the hadron spectrum and decay constants of these theories\, and use the g
radient flow approach to determine the length scales.\n\nhttps://conferenc
e.ippp.dur.ac.uk/event/470/contributions/2472/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2472/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QCD with isospin chemical potential: pion condensation
DTSTART;VALUE=DATE-TIME:20160728T153000Z
DTEND;VALUE=DATE-TIME:20160728T155000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2471@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Gergely Endrodi (University of Frankfurt)\nWe study
the QCD phase diagram at nonzero isospin chemical potential\nusing 2+1 fla
vors of staggered fermions with physical quark masses at\ndifferent lattic
e spacings and volumes. The talk focuses on the\ntransition to the pion co
ndensation phase at high chemical potentials.\nThis phase is characterized
by a proliferation of low modes that slow\ndown the simulation considerab
ly and necessitate the use of an\ninfrared regulator. We discuss a novel s
trategy to determine the pion\ncondensate in the limit of vanishing regula
tors.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2471/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2471/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A New Perspective on Chiral Gauge Theories
DTSTART;VALUE=DATE-TIME:20160730T091500Z
DTEND;VALUE=DATE-TIME:20160730T094500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2470@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: David Kaplan (Institute for Nuclear Theory)\nI revie
w some of the different approaches that have been pursued in attempting to
define chiral gauge theories on the lattice\, all of which are procedure
s for eliminating unwanted mirror fermions from the theory. I then discuss
a recently published proposal with D. Grabowska that combines domain wall
fermions with gradient flow as a new idea for how to decouple the mirror
fermions\, and which seems to imply unexpected nonperturbative effects.\n\
nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2470/
LOCATION:University of Southampton\, Highfield Campus Building 32 (EEE) Ro
om 1015 and Building 67 (Nightingale) Room 1027 via video link
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2470/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Richard Feynman\, Data-Intensive Science and the Future of Computi
ng
DTSTART;VALUE=DATE-TIME:20160730T101500Z
DTEND;VALUE=DATE-TIME:20160730T104500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2469@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Tony Hey (STFC)\nThis talk will discuss three curren
t trends in computing: quantum computers\; data-intensive computing and th
e recent resurgence in AI and Machine Learning\; Exascale computing and th
e end of Moore’s Law. Although Richard Feynman is famous for his Nobel P
rize for QED and his Feynman Diagrams\, and for his three volume set of Le
ctures on Physics\, it is not so well-known that he gave lectures on compu
ting for the last five years of his life. In these lectures he was first t
o propose building a quantum computer. After an introduction to Feynman’
s ideas on quantum computing\, the ‘Big Data’ revolution in science wi
ll be discussed. The analysis of PetaBytes of CERN LHC data to find the Hi
ggs Boson is one example but the explosion of experimental data is now imp
acting almost every field of science. We then briefly look at ‘Big Data
’ applications outside of science and the emergence of ‘smart technolo
gies’ in many aspects of everyday life. Finally\, we end with a look at
Exascale computing and some of the implications of the coming end of Moore
’s Law.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/246
9/
LOCATION:University of Southampton\, Highfield Campus Building 32 (EEE) Ro
om 1015 and Building 67 (Nightingale) Room 1027 via video link
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2469/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fermion bags\, topology and index theorems
DTSTART;VALUE=DATE-TIME:20160725T135500Z
DTEND;VALUE=DATE-TIME:20160725T141500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2468@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Shailesh Chandrasekharan (Duke University)\nIn this
talk we argue that the fermion bag formulation extends the concepts of top
ology and index theorems associated with non-Abelian gauge theories\, to s
imple lattice fermion field theories. Through such a connection we learn t
hat fermion masses can arise in at least two different ways:(1) a conventi
onal way where some lattice symmetry of the action is spontaneously\, expl
icitly or anomalously broken and (2) an unconventional way where all latti
ce symmetries are preserved. We argue for these two scenarios by consideri
ng simple examples of lattice field theories formulated with staggered fer
mions.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2468/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2468/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non perturbative renormalization of flavor singlet quark bilinear
operators in lattice QCD
DTSTART;VALUE=DATE-TIME:20160727T082000Z
DTEND;VALUE=DATE-TIME:20160727T084000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2467@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Stefano Piemonte (University of Regensburg)\nWe repo
rt on our studies of the renormalization of flavor singlet quark bilinear
operators in lattice QCD. The renormalization constants are determined non
-perturbatively using gauge field ensembles with Nf=2 dynamical clover im
proved fermions. The renormalization is performed in the RI-MOM and RI-SMO
M schemes. The difference between flavor singlet and non-singlet quark bil
inear operators is a disconnected contribution\, which has to be evaluated
by stochastic estimators. We compare our results with perturbation theory
.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2467/
LOCATION:Highfield Campus\, Universit of Southampton Building 67 Room 1027
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2467/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The strange and charm contributions to $a_\\mu$ with physical quar
k masses using M\\"obius domain wall fermions
DTSTART;VALUE=DATE-TIME:20160726T161000Z
DTEND;VALUE=DATE-TIME:20160726T163000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2466@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Spraggs Matthew (University of Southampton)\nI prese
nt our work on the leading strange and charm quark-connected contributions
to the muon anomalous magnetic moment using RBC/UKQCD physical point doma
in wall fermion ensembles.\n\nhttps://conference.ippp.dur.ac.uk/event/470/
contributions/2466/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2466/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Comparison of CLE and reweighting for QCD at nonzero density
DTSTART;VALUE=DATE-TIME:20160726T161000Z
DTEND;VALUE=DATE-TIME:20160726T163000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2465@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Denes Sexty (Uni Wuppertal)\nLattice QCD at non-vani
shing chemical potential is studied using the complex Langevin equation (C
LE). We compare the results with multi-parameter reweighting both from μ=
0 and phase quenched ensembles. A good agreement is found for lattice spac
ings below ≈0.15 fm. On coarser lattices the complex Langevin approach b
reaks down. Four flavors of staggered fermions are used on Nt=4\,6 and 8 l
attices. We also discuss the issue of poles for CLE simulations of HDQCD a
nd full QCD.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/
2465/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2465/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Centre vortices are the seeds of dynamical chiral symmetry breakin
g
DTSTART;VALUE=DATE-TIME:20160729T153000Z
DTEND;VALUE=DATE-TIME:20160729T155000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2464@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Waseem Kamleh (University of Adelaide)\nWe reveal a
fundamental connection between centre\nvortices and several key features a
ssociated with dynamical\nchiral symmetry breaking and quark confinement.
Calculations are\nperformed in pure $\\mathrm{SU}(3)$ gauge theory using t
he chiral\noverlap fermion action. Starting from the original gauge field\
, a\nvortex identification procedure yields vortex-removed and vortex-only
\nbackgrounds. By studying the quark mass function\, we demonstrate the\nr
emoval of dynamical mass generation via the removal of the\ncentre-vortex
degrees of freedom from the gauge fields. The low-lying\nhadron mass spect
rum is also calculated\, with results that are\nconsistent with the restor
ation of chiral symmetry on vortex-removed\nbackgrounds at light quark mas
ses.\n\nRemarkably\, we observe that the vortex-only degrees of freedom ar
e\nable to encapsulate the qualitative features of the original gauge\nfie
lds. Through visualisations of the topological charge density\, we\nfind e
vidence of a link between centre vortices and the instanton\nstructure of
the vacuum\, specifically vortex-only backgrounds provide\ngauge-field deg
rees of freedom sufficient to create instantons upon\ncooling. Furthermore
\, after some smoothing\, we observe dynamical mass\ngeneration on the vor
tex-only backgrounds consistent with that of the\noriginal gauge-field ens
emble.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2464/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2464/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon EDM from Chromo EDM using Domain-Wall Fermion
DTSTART;VALUE=DATE-TIME:20160726T190000Z
DTEND;VALUE=DATE-TIME:20160726T200000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2463@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Hiroshi Ohki (RIKEN BNL Research Center)\, Sergey Sy
ritsyn (Jefferson Lab)\nWe present a progress report on the study of the C
P violation effects on the nucleon from the quark chromoelectric dipole mo
ment (cEDM) operator using $N_f=2+1$ dynamical Domain-Wall fermions. Detai
ls of the calculation and preliminary results for $m_\\pi = 170$ and 250 M
eV will be reported.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contri
butions/2463/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2463/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Running coupling of twelve flavors
DTSTART;VALUE=DATE-TIME:20160726T130000Z
DTEND;VALUE=DATE-TIME:20160726T132000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2462@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Daniel Nogradi (Eotvos University)\nNumerical result
s are reported on the discrete $\\beta$-function of $SU(3)$ gauge theory w
ith $N_f=12$ fundamental fermions in the gradient flow scheme. Controlled
continuum extrapolation is performed for $s=2\\\;$ scale change with $c =
\\sqrt{8t} / L = 0.2$ targeting 3 tuned values of the renormalized couplin
g\, approximately $g^2=6.0\,\\\; 6.2\\\;$ and $\\\;6.4$. Contrary to a pre
vious claim\, no evidence is found for a zero of the continuum $\\beta$-fu
nction.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2462/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2462/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Strongly Coupled Composite Dark Matter
DTSTART;VALUE=DATE-TIME:20160730T084500Z
DTEND;VALUE=DATE-TIME:20160730T091500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2363@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Enrico Rinaldi (LLNL)\nModels of composite dark matt
er\, originating from a new strongly coupled dark sector\, have a very int
eresting phenomenology.\nTo make robust predictions in these models one of
ten needs to investigate non-perturbative effects due to the strong self i
nteractions.\nLattice field theory methods and numerical simulations are w
ell suited for this task and contribute to a solid uncertainty quantificat
ion.\nIn this talk I review recent works in this direction\,comparing latt
ice results for composite dark matter interactions to experimental bounds.
\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2363/
LOCATION:University of Southampton\, Highfield Campus Building 32 (EEE) Ro
om 1015 and Building 67 (Nightingale) Room 1027 via video link
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2363/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards the continuum limit with improved Wilson fermions employin
g open boundary conditions. Part 1.
DTSTART;VALUE=DATE-TIME:20160729T153000Z
DTEND;VALUE=DATE-TIME:20160729T155000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2362@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Wolfgang Soeldner (Regensburg University)\nWe presen
t results obtained by RQCD on various observables\, obtained from simulati
ons of $N_f=2+1$ flavours of non-perturbatively order-$a$ improved Wilson
fermions\, employing open boundary conditions in time\, that were created
within the CLS (Coordinated Lattice Simulations) effort. Configurations at
five different values of the lattice spacing\, ranging from 0.086 fm down
to below 0.04 fm exist and many quark mass combinations\, in particular a
long a line of an (almost) constant sum of quark masses and a constant ren
ormalized strange quark mass have been generated. Several key observables\
, mostly meson and baryon masses have been computed\, and these results wi
ll be presented. In some cases a precise and controlled extrapolation to t
he continuum limit has become possible.\n\nhttps://conference.ippp.dur.ac.
uk/event/470/contributions/2362/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2362/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Check of a new non-perturbative mechanism for elementary fermion m
ass generation
DTSTART;VALUE=DATE-TIME:20160728T132000Z
DTEND;VALUE=DATE-TIME:20160728T134000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2361@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Marco Garofalo (University of Edinburgh)\nWe conside
r a field theoretical model where a SU(2) doublet fermion\, subjected to n
on-abelian gauge interactions\, is also coupled to a complex scalar field
doublet via a Yukawa and an irrelevant Wilson-like term. Despite the prese
nce of these two chiral breaking operators in the Lagrangian\, an exact sy
mmetry acting on fermions and scalars prevents perturbative mass correctio
ns. In the phase where fermions are massless (Wigner phase) the Yukawa cou
pling can be tuned to a critical value at which chiral transformations act
ing on fermions only become a symmetry of the theory (up to cutoff effects
). In the Nambu-Goldstone phase of the critical theory a fermion mass term
of dynamical origin is expected to arise in the Ward identities of the pu
rely fermionic chiral transformations. Such a non-perturbative mechanism o
f dynamical mass generation can provide a “natural" (a` la 't Hooft) alt
ernative to the Higgs mechanism adopted in the Standard Model.\n\nhttps://
conference.ippp.dur.ac.uk/event/470/contributions/2361/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2361/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Adjoint SU(2) with four fermion interactions
DTSTART;VALUE=DATE-TIME:20160728T165000Z
DTEND;VALUE=DATE-TIME:20160728T171000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2360@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Jarno Rantaharju (CP3-Origins)\nFour fermion interac
tions appear in many models of Beyond Standard Model physics. In composite
Higgs models Standard Model fermion masses can be generated by four fermi
on terms. They are also expected to modify the dynamics of the new strongl
y interacting sector. In particular in technicolour models it has been sug
gested that they can be used to break infrared conformality and produce a
walking theory with a large mass anomalous dimension. We study the SU(2) g
auge theory with 2 adjoint fermions and a chirally symmetric four fermion
term. We demonstrate chiral symmetry breaking at large four fermion coupli
ng and study the phase diagram of the model.\n\nhttps://conference.ippp.du
r.ac.uk/event/470/contributions/2360/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2360/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Effective Polyakov Loop Models for QCD-like Theories at Finite Den
sity
DTSTART;VALUE=DATE-TIME:20160729T144000Z
DTEND;VALUE=DATE-TIME:20160729T150000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2359@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Philipp Scior (TU Darmstadt)\nWe study the heavy qua
rk limit of QCD-like theories by using a three-dimensional Polyakov theory
. This theory can be derived from the full QCD-like theory by a combined s
trong coupling and hopping expansion. In particular we investigate the col
d and dense regime of the phase diagram where we expect to find the Silver
blaze property realized as Bose-Einstein-condensation of diquarks or a fis
t order liquid-gas transition depending on the gauge group of the theory.
We find evidence for the Silverblaze property when the quark chemical pote
ntial $\\mu$ reaches half the diquark mass. For even higher $\\mu$ we find
a the rise of the Polyakov loop as well as the quark number density.\n\nh
ttps://conference.ippp.dur.ac.uk/event/470/contributions/2359/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2359/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Simulating low dimensional QCD on Lefschetz thimbles
DTSTART;VALUE=DATE-TIME:20160727T080000Z
DTEND;VALUE=DATE-TIME:20160727T082000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2358@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Christian Schmidt (Universitaet Bielefeld)\nNon-pert
urbative lattice QCD calculations at non-vanishing baryon\nnumber density
are hampered by the sign problem. The path\nintegral becomes highly oscill
ating and standard Monte Carlo techniques\nseize working. One possible sol
ution is the Lefschetz thimble\napproach. It requires a deformation of the
original integration domain\ninto a manifold embedded in complex space. F
or properly chosen\nintegration manifolds (``thimbles'') the sign problem
is drastically\nalleviated. For some bosonic and fermionic models this app
roach has\nbeen shown to work. In this talk we will discuss aspects of the
\nthimble discretization of low dimensional QCD.\n\nhttps://conference.ipp
p.dur.ac.uk/event/470/contributions/2358/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2358/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$B\\to\\pi$ semileptonic decay form factors with NRQCD/HISQ quarks
DTSTART;VALUE=DATE-TIME:20160729T163000Z
DTEND;VALUE=DATE-TIME:20160729T165000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2357@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Chris Bouchard (William &\; Mary)\nWe report on o
ur ongoing calculation of the $B\\to\\pi$ semileptonic decay form factors
using NRQCD/HISQ valence quarks with MILC's $N_f=2+1$ asqtad ensembles.
The use of HISQ light quarks allows simulation at large pion momenta\, cor
responding to $q^2\\approx 0$\, with controlled $(ap)^2$ errors. We perf
orm a simultaneous chiral\, continuum\, and kinematic extrapolation using
the Hard Pion ChPT modified $z$ expansion developed in Phys. Rev. D 90\, 0
54506 (2014). This approach permits lattice simulation in a kinematic re
gion previously considered inaccessible to lattice QCD and promises signif
icant reduction in form factor uncertainties at low $q^2$.\n\nhttps://conf
erence.ippp.dur.ac.uk/event/470/contributions/2357/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2357/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thermodynamics with continuum extrapolated overlap fermions
DTSTART;VALUE=DATE-TIME:20160725T133500Z
DTEND;VALUE=DATE-TIME:20160725T135500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2356@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Sandor Katz Katz (Eotvos University\, Budapest)\nWe
study the QCD transition with dynamical overlap fermions. A continuum extr
apolation is carried out using lattices up to N_t=12. We use a fixed topol
ogy approach and study its effect on our observables.\n\nhttps://conferenc
e.ippp.dur.ac.uk/event/470/contributions/2356/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2356/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-perturbative matching of HQET heavy-light axial and vector cur
rents in N_f=2 lattice QCD
DTSTART;VALUE=DATE-TIME:20160727T080000Z
DTEND;VALUE=DATE-TIME:20160727T082000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2355@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Jochen Heitger (University of Muenster\, ITP)\nBased
on a non-perturbative matching strategy between Heavy Quark Effective The
ory (HQET) at O(1/m) and finite-volume QCD\, we report on our determinatio
n of the effective theory parameters of all components of the HQET heavy-l
ight axial and vector currents in two-flavour lattice QCD. These parameter
s\, which can be fixed by matching conditions between suitable QCD and HQE
T observables evaluated through numerical simulations\, are required to ab
sorb the power divergences of lattice HQET\, as\, for instance\, encounter
ed in\nan effective theory computation of form factors for semi-leptonic d
ecays of B- and B_s-mesons.\n\nhttps://conference.ippp.dur.ac.uk/event/470
/contributions/2355/
LOCATION:Highfield Campus\, Universit of Southampton Building 67 Room 1027
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2355/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pion structure from twisted mass lattice QCD down to the physical
pion mass
DTSTART;VALUE=DATE-TIME:20160729T140000Z
DTEND;VALUE=DATE-TIME:20160729T142000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2354@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Bartosz Kostrzewa (HISKP (Theory) - Universitaet Bon
n)\nWe present an investigation of pion structure based on ETMC $N_f=2$ an
d $N_f=2+1+1$\ntwisted mass configurations at maximal twist. We compute\nt
he first two moments of the quark momentum fraction of the pion and the el
ectromagnetic form factor.\nFor the latter\, momentum is injected using tw
isted boundary conditions and $F_\\pi(Q^2)$ is calculated\nat the physical
pion mass. We find that our data is consistent with vector meson dominanc
e and\nexperimental data in the region of momentum transfer $Q^2 > 0.01$ $
\\\,\\mathrm{GeV}^2$.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contr
ibutions/2354/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2354/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Real-time simulations of anomaly induced transport in external mag
netic field
DTSTART;VALUE=DATE-TIME:20160727T111000Z
DTEND;VALUE=DATE-TIME:20160727T113000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2353@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Senia Valgushev (Regensburg University)\nOne of the
macroscopic manifestations of the Chiral anomaly in a matter with Dirac fe
rmions is a large negative magnetoresistivity in strong magnetic fields\,
which is common feature of Weyl- and Dirac semimetals and QCD. However\, m
ost of previous studies have been done in the linear response approach in
non-interacting theory. We study Magnetoresistivity in a model of Dirac se
mimetal using Wilson-Dirac lattice fermions with on-site four-fermion inte
ractions in the background of magnetic field in the framework of mean-fiel
d theory and classical-statistical real-time simulations with arbitrary ex
ternal electric fields. We investigate the phase diagram of the model and
discuss the fate of dynamically generated chiral imbalance in the system\,
as well as manifestations of dynamical axion field.\n\nhttps://conference
.ippp.dur.ac.uk/event/470/contributions/2353/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2353/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mass anomalous dimension of SU(2) using the spectral density metho
d
DTSTART;VALUE=DATE-TIME:20160726T180000Z
DTEND;VALUE=DATE-TIME:20160726T190000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2352@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Joni Suorsa (University of Helsinki\, Helsinki Insti
tute of Physics)\nWe study the mass anomalous dimension of SU(2) with $N_f
=6$ and $N_f = 8$ in both massless and massive quark cases for a range of
gauge coupling values. In the massless case we find behaviour consistent w
ith results obtained using the Schrödinger functional method.\n\nhttps://
conference.ippp.dur.ac.uk/event/470/contributions/2352/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2352/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Selected new results from the spectroscopy of the sextet BSM model
DTSTART;VALUE=DATE-TIME:20160726T144000Z
DTEND;VALUE=DATE-TIME:20160726T150000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2351@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: chik him Wong (University of Wuppertal)\nWe will pre
sent results on important spectroscopy problems of the sextet composite Hi
ggs model selected from the light scalar spectrum\, vector resonances\, th
e eta’ particle of the axial anomaly\, and spectroscopy analysis using a
mixed action with restored chiral symmetry of valence fermions.\n\nhttps:
//conference.ippp.dur.ac.uk/event/470/contributions/2351/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2351/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Progress on three-particle quantization condition
DTSTART;VALUE=DATE-TIME:20160726T144000Z
DTEND;VALUE=DATE-TIME:20160726T150000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2350@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Stephen Sharpe (University of Washington)\nWe report
progress on extending the relativistic model-independent quantization con
dition for three particles to a broader class of theories\, and in checkin
g the formalism. Topics that will be touched on are: (i) the extension to
include the possibility of 2->3 and 3->2 transitions and (ii) checks of th
e formalism by comparing to threshold expansions and to the energy shift o
f a three-particle Efimov-like bound state.\n\nhttps://conference.ippp.dur
.ac.uk/event/470/contributions/2350/
LOCATION:Highfield Campus\, University of Southampton Bulding B2a Room 206
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2350/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Algorithms for disconnected diagrams.
DTSTART;VALUE=DATE-TIME:20160727T105000Z
DTEND;VALUE=DATE-TIME:20160727T111000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2349@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Arjun Gambhir (College of William and Mary/JLab)\nCo
mputing disconnected diagrams on the lattice involves taking the trace of
the inverse of the Dirac operator. This is a computationally challenging p
roblem\, however recent algorithmic improvements such as low mode averagin
g and hierarchical probing have increased the efficiency of this trace est
imation. We detail an algorithm that builds upon hierarchical probing by d
eflating the near null space of the Dirac matrix. An additional order of m
agnitude of variance reduction is achieved by combining these two methods
and we explore this synergy both theoretically and experimentally. Finally
\, we apply this algorithm to calculate contributions to the Pauli and Dir
ac form factors of the nucleon\, and present initial results.\n\nhttps://c
onference.ippp.dur.ac.uk/event/470/contributions/2349/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2349/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Search for a continuum limit of the PMS phase
DTSTART;VALUE=DATE-TIME:20160726T165000Z
DTEND;VALUE=DATE-TIME:20160726T171000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2348@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Venkitesh Ayyar (Duke University)\nPrevious studies
of a simple four-fermion model with staggered fermions in 3d have shown th
e existence of an exotic quantum critical point\, where one may be able to
define a continuum limit of the Paramagnetic Strong Phase (or the PMS pha
se). We believe the existence of the critical point suggests a new mechani
sm for generating fermion masses. In this work we begin the search for thi
s quantum critical point in 4d by extending the 3d model to 4d.\nUnlike in
3d\, now we do find evidence for an intermediate spontaneously broken pha
se (FM phase) and are able compute the phase boundaries accurately. In ter
ms of the bare coupling\, the width of the intermediate region appears to
be quite small.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributi
ons/2348/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2348/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon charges and form factors from clover-on-clover and clover-
on-HISQ simulations
DTSTART;VALUE=DATE-TIME:20160728T165000Z
DTEND;VALUE=DATE-TIME:20160728T171000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2347@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Rajan Gupta (Los Alamos National Laboratory)\nHigh p
recision estimates of the iso-vector nucleon charges g_A\, g_S and g_T\, e
lectric\, magnetic and axial form factors measured on four ensembles of 2+
1 flavor clover fermions will be presented and compared with those from cl
over-on-HISQ calculations. An analysis of systematic uncertainties due the
lattice volume\, lattice spacing\, quark mass and renormalization will al
so be presented for both sets of calculations. Phenomenological implicati
ons and constraints on novel scalar and tensor interactions at the TeV sca
le will be discussed.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contr
ibutions/2347/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2347/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quark Chromoelectric Dipole Moment Contribution to the Neutron Ele
ctric Dipole Moment
DTSTART;VALUE=DATE-TIME:20160725T154500Z
DTEND;VALUE=DATE-TIME:20160725T160500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2346@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Tanmoy Bhattacharya (Los Alamos National Laboratory)
\nThe quark chromo-electric dipole moment operator and the pseudo-scalar f
ermion bilinear with which it mixes under renormalization can both be incl
uded in a calculation of the electromagnetic form factor of the nucleon us
ing the Schwinger source method. A preliminary calculation of these opera
tors using clover quarks on HISQ lattices generated by MILC collaboration
will be presented showing the quality of the signal in the correlators nec
essary for calculating the neutron electric dipole moment.\n\nhttps://conf
erence.ippp.dur.ac.uk/event/470/contributions/2346/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2346/
END:VEVENT
BEGIN:VEVENT
SUMMARY:How to make a quantum black hole with ultra-cold gases
DTSTART;VALUE=DATE-TIME:20160725T172500Z
DTEND;VALUE=DATE-TIME:20160725T174500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2345@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Masanori Hanada (Kyoto U\, Stanford U)\nWe argue tha
t a small\, quantum black hole can be made from atoms and lasers.\n\nThe h
olographic principle claims that the quantum gravitational systems\, e.g.
superstring theory\, is equivalent to non-gravitational quantum systems\,
e\,g. super Yang-Mills theory. Here the 'equivalence' means two theories c
annot be distinguished even in principle. Therefore\, if the holographic p
rinciple is true\, then by engineering the non-gravitational systems by us
ing an optical lattice\, one can create actual quantum black holes.\n\nIn
this presentation\, we consider the simplest example: the Sachdev-Ye-Kitae
v (SYK) model.\nWe design a an experimental scheme for creating the SYK mo
del with use of ultra-cold fermionic atoms. \n\nThis presentation is based
on a paper "Creating and probing the Sachdev-Ye-Kitaev model with ultraco
ld gases: Towards experimental studies of quantum gravity\," arXiv:1606.02
454 with Ippei Danshita (Yukawa Institute for Theoretical Physics\, Kyoto
University) and Masaki Tezuka (Deptartment of Physics\, Kyoto University).
\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2345/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2345/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Vus from inclusive strange tau decay data and lattice HVP
DTSTART;VALUE=DATE-TIME:20160728T144000Z
DTEND;VALUE=DATE-TIME:20160728T150000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2344@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Hiroshi Ohki (RIKEN BNL Research Center)\nWe present
a novel approach to determining Vus which employs inclusive\nstrange hadr
onic tau decay data and hadronic vacuum polarization functions\n(HVPs) com
puted on the lattice. The experimental and lattice data are\nrelated throu
gh dispersion relations which employ a class of weight functions\nwhich ar
e products of factors having poles at Euclidean Q^2.\n\nImplementing this
approach using lattice data generated by the RBC/UKQCD\ncollaboration\, we
show examples of weight functions which allow the\ncombination of lattice
HVPs required for this analysis to be determined\nwith good accuracy whil
e at the same time strongly suppressing spectral\nintegral contributions f
rom the region where experimental data either\nhave large uncertainties or
do not exist.\n\nPreliminary results for Vus obtained using this approach
will be presented\nand shown to be in good agreement with those obtained
from analyses of kaon\nphysics and 3-family CKM unitarity.\n\nRelated back
ground\, details of the experimental data employed and the\ncurrent status
of the conventional flavor-breaking sum rule tau V_us puzzle\,\nas well a
s an outline of the advantages of the new approach over the\nconventional
sum rule analysis will be discussed in the talk by Kim Maltman.\nSome rela
ted studies\, involving applications to the running of alpha_QED\nand the
Weinberg angle\, and a possible application to muon g-2 will\nalso be disc
ussed\, as time permits.\n\nhttps://conference.ippp.dur.ac.uk/event/470/co
ntributions/2344/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2344/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon form factors near the physical point in 2+1 flavor QCD
DTSTART;VALUE=DATE-TIME:20160728T153000Z
DTEND;VALUE=DATE-TIME:20160728T155000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2343@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Yoshinobu Kuramashi (University of Tsukuba/RIKEN AIC
S)\nWe present preliminary results for nucleon form factors including the
axial charge and the Dirac radius in 2+1 flavor QCD at the almost physical
pion mass on a $96^4$ lattice with the lattice spacing of 0.084 fm. The c
onfigurations are generated with the stout-smeared $O(a)$-improved Wilson
quark action and the Iwasaki gauge action at beta=1.82. A large spatial vo
lume of (8.1fm$)^3$ allows us to investigate the form factors at small mom
entum transfer region. We discuss analyses of the momentum dependence of t
he form factors.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributi
ons/2343/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2343/
END:VEVENT
BEGIN:VEVENT
SUMMARY:O(4) scaling analysis in two-flavor QCD at finite temperature and
density with improved Wilson quarks
DTSTART;VALUE=DATE-TIME:20160726T190000Z
DTEND;VALUE=DATE-TIME:20160726T200000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2342@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Takashi UMEDA (Hiroshima Univ.)\nWe study scaling be
havior of a chiral order parameter in the low density\nregion\, performing
a simulation of two-flavor lattice QCD with improved\nWilson quarks. It h
ave been confirmed that the scaling behavior of the\nchiral order paramete
r defined by a Ward-Takahashi identity agrees with\nthe scaling function o
f the three-dimensional O(4) spin model at zero\nchemical potential. We di
scuss the scaling properties of the chiral\nphase transition at finite den
sity\, applying the reweighting method and\ncalculating derivatives of the
chiral order parameter with respect to\nthe chemical potential. In the co
mparison between the scaling functions\nof the O(4) spin model and QCD at
low density\, there is a fit parameter\nwhich can be interpreted as the cu
rvature of the chiral phase transition\ncurve in the QCD phase diagram wit
h respect to temperature and chemical\npotential. We determine the curvatu
re of the phase boundary by the\nfitting. The physical scale is set by the
gradient flow.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributio
ns/2342/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2342/
END:VEVENT
BEGIN:VEVENT
SUMMARY:New results for QCD at non-vanishing chemical potentials from Tayl
or expansion
DTSTART;VALUE=DATE-TIME:20160725T145500Z
DTEND;VALUE=DATE-TIME:20160725T151500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2341@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Edwin Laermann (Bielefeld University)\nWe present re
cent results for QCD at non-vanishing chemical potentials for baryon numbe
r\, electric charge and strangeness.\nThe results are obtained from Taylor
expanding the QCD partition function up to sixth order in these potential
s.\nThe numerical simulations for two light and one strange quark have bee
n carried out on the basis of the Highly Improved Staggered Quark (HISQ) d
iscretization scheme at lattice spacings which in the vicinity of the chir
al transition temperature correspond to temporal extents of Nt = 6\, 8 and
12\, and at mass values which correspond to a physical Kaon mass and pion
Goldstone masses around the physical value of 140 MeV.\nThe results on\,
for instance\, the equation of state are obtained as function of the three
different chemical potentials and can thus also easily be adjusted to exp
erimental conditions met in heavy ion colliders.\n\nhttps://conference.ipp
p.dur.ac.uk/event/470/contributions/2341/
LOCATION:Highfield Campus\, University of Southampton Building 32 Room 101
5
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2341/
END:VEVENT
BEGIN:VEVENT
SUMMARY:What we can learn from two-dimensional QCD-like theories at finite
density
DTSTART;VALUE=DATE-TIME:20160729T134000Z
DTEND;VALUE=DATE-TIME:20160729T140000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2340@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Bjoern Wellegehausen (ITP University Giessen)\nTheor
etical knowlegde about the nonperturbative aspects of the phase diagram of
QCD is of utmost \nimportance for the design of future collider experimen
ts or the understanding of cold and dense neutron stars.\n\nSince lattice
QCD suffers from a severe sign problem at finite density\, QCD-like theori
es are useful to understand the phase diagram\nof baryonic matter at finit
e density. Most QCD-like theories (two-color QCD\, $G_2$-QCD or adjoint QC
D) contain bosonic baryons\, for example diquarks\, or other more exotic t
ypes of matter.\nIt is important to understand the interactions of these p
articles with ordinary fermionic baryons present in QCD.\n\nSimulations of
these theories\, for instance $G_2$-QCD\, reveal an interesting and rich
phase diagram at zero temperature. Many open questions arise\, partly due
to the lack of high precision or large volume/continuum data. This is the
reason why we study two-dimensional QCD-like theories. In the talk we shal
l discuss\ndifferences between QCD-like theories at baryon chemical and is
ospin chemical potential. Furthermore we present simulation results on the
phase diagram and spectroscopy at finite density for $G_2$- and two-color
-QCD and compare it to free lattice fermions. Finally we give an outlook t
o our ongoing simulations in four dimensions.\n\nhttps://conference.ippp.d
ur.ac.uk/event/470/contributions/2340/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2340/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Four-Fermion Theories with Exact Chiral Symmetry in Three Dimensio
ns
DTSTART;VALUE=DATE-TIME:20160727T090000Z
DTEND;VALUE=DATE-TIME:20160727T092000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2339@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Daniel Schmidt (Friedrich Schiller University Jena)\
nWe investigate a class of quantum field theories of fermions interacting
by a quartic coupling.\nThis includes well-known models like the Gross-Nev
eu model and the Thirring model.\nIn three spacetime dimensions\, these mo
dels are used to describe properties of solid state systems like high temp
erature superconductors and graphene.\nAdditionally\, they are interesting
as toy models to study chiral symmetry breaking.\n\nThe Gross-Neveu model
always has a broken and a symmetric phase\, while the existence of a brok
en phase in the Thirring model depends on the number of fermion flavours.\
nThe critical number of fermion flavours for chiral symmetry breaking is s
till subject of ongoing discussion.\nUsing SLAC fermions\, we are able to
simulate the Thirring model with exact chiral symmetry\, but the chiral co
ndensate is not obtainable on a finite lattice without explicit breaking.\
n\nThe talk presents approaches to circumvent this problem.\nWe use Fierz
identities to transform the Thirring model into other four-fermion models\
, where the chiral condensate does not vanish.\nThese models show a sign p
roblem\, which is not present in the original Thirring model.\nWe present
an algorithm inspired by fermion bags\, which may overcome this short comi
ng.\nAs a second approach\, the chiral symmetry breaking of a larger class
of four-fermion models is studied.\n\nhttps://conference.ippp.dur.ac.uk/e
vent/470/contributions/2339/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2339/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Large mass hierarchies from strongly-coupled dynamics
DTSTART;VALUE=DATE-TIME:20160725T145500Z
DTEND;VALUE=DATE-TIME:20160725T151500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2338@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Ed Bennett (Swansea University)\nMotivated by tentat
ive signals of new physics at the LHC\, which seems to imply the presence
of large mass hierarchies\, we investigate the theoretical possibility tha
t these could arise dynamically in new strongly-coupled gauge theories ext
ending the standard model of particle physics. To this purpose\, we study
lattice data on non-Abelian gauge theories in the (near-)conformal regime
—specifically\, $\\mathrm{SU}(2)$ with $N_{\\mathrm{f}}=1$ and $2$ dynam
ical fermion flavours in the adjoint representation. We focus our attentio
n on the ratio $R$ between the masses of the lightest spin-2 and spin-0 re
sonances\, and draw comparisons with a simple toy model in the context of
gauge/gravity dualities. For models in which large anomalous dimensions ar
ise dynamically\, we show indications that this mass ratio can be large\,
with $R > 5$. Moreover\, our results suggest that $R$ might be related to
universal properties of the IR fixed point. Our findings provide an intere
sting step towards understanding large mass ratios in the non-perturbative
regime of quantum field theories with (near) IR conformal behaviour.\n\nh
ttps://conference.ippp.dur.ac.uk/event/470/contributions/2338/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2338/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Spectroscopy of two dimensional N=2 Super Yang Mills theory
DTSTART;VALUE=DATE-TIME:20160726T163000Z
DTEND;VALUE=DATE-TIME:20160726T165000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2337@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Daniel August (Friedrich Schiller University Jena)\n
Albeit the standard model is the most successful model of particles physic
s\, it still has some theoretical shortcomings\, for instance the hierarch
y problem\, the absence of dark matter\, etc. . Supersymmetric extensions
of the standard model could be a possible solution to these problems.\n\nO
ne of the building blocks of these supersymmetric models are supersymmetri
c gauge theories. It is expected that they exhibit interesting features li
ke confinement\, chiral symmetry breaking\, magnetic monopoles and the lik
e.\nWe present new results on N=2 Super Yang Mills theory in two dimension
s. The lattice action is derived by a dimensional reduction of the N=1 Sup
er Yang Mills theory in four dimensions. By preserving the R symmetry of t
he four dimensional model we can exploit Ward identities to fine tune our
parameters of the model to obtain the chiral and supersymmetric continuum
limit. This allows us to calculate the mass spectrum at the physical point
and compare these results with effective field theories.\n\nhttps://confe
rence.ippp.dur.ac.uk/event/470/contributions/2337/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2337/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Asymptotically safe gauge-Yukawa theories and functional renormali
sation group
DTSTART;VALUE=DATE-TIME:20160725T164500Z
DTEND;VALUE=DATE-TIME:20160725T170500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2336@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Tugba Buyukbese (University of Sussex)\nRecently\, n
ew four-dimensional (gauge-Yukawa) theories have been discovered which \nd
isplay exact interacting fixed points at highest energies. In a regime whe
re asymptotic \nfreedom is lost\, these novel types of theories develop an
asymptotically safe UV fixed \npoint\, strictly controlled by perturbatio
n theory. In this talk\, we extend these studies to include couplings with
non-vanishing canonical mass dimension. Using the method of \nfunctional
renormalisation\, we determine the full fixed point potential including hi
gher \norder invariants of e.g. the scalar and fermionic fields. We also c
ompute the universal\nscaling exponents and establish consistency of the t
heory beyond the restriction to \nclassically marginal operators.\n\nhttps
://conference.ippp.dur.ac.uk/event/470/contributions/2336/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2336/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Renormalization of three-quark operators for baryon distribution a
mplitudes
DTSTART;VALUE=DATE-TIME:20160725T172500Z
DTEND;VALUE=DATE-TIME:20160725T174500Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2335@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Michael Gruber (RQCD collaboration)\nOctet baryon di
stribution amplitudes are non-perturbative objects of phenomenological int
erest parametrizing the momentum distribution within the corresponding Foc
k states. Their normalization and their moments can be calculated using l
attice QCD\, and such results require renormalization. However\, the MS-ba
r scheme\, i.e.\, the renormalization scheme used in phenomenological appl
ications\, necessitates a perturbative approach in non-integer spacetime d
imension and is therefore not well suited for lattice calculations. Instea
d\, we renormalize the lattice results non-perturbatively in a RI'/SMOM sc
heme and carry out the conversion to the MS-bar scheme in continuum pertur
bation theory. Using group theoretical and symmetry considerations we have
constructed optimized three-quark operator bases for the renormalization
procedure in order to minimize mixing.\n\nhttps://conference.ippp.dur.ac.u
k/event/470/contributions/2335/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2335/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tensor renormalization group approach to higher dimensional fermio
ns
DTSTART;VALUE=DATE-TIME:20160726T171000Z
DTEND;VALUE=DATE-TIME:20160726T173000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2334@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Ryo Sakai (Kanazawa University)\nWe apply the higher
order tensor renormalization group to two and three dimensional lattice f
ermion systems. To deal with the tensor network including Grassmann number
s\, higher order Grassmann tensor renormalization group (HOGTRG) is introd
uced. Because of its deterministic property\, HOGTRG is perfectly free of
the sign problem. We analyze the well-known systems such as the Gross–Ne
veu model using HOGTRG\, and test the validity of the new algorithm.\n\nht
tps://conference.ippp.dur.ac.uk/event/470/contributions/2334/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2334/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Semi-leptonic form factors for rare $B$ decays
DTSTART;VALUE=DATE-TIME:20160729T161000Z
DTEND;VALUE=DATE-TIME:20160729T163000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2333@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Edwin Lizarazo (University of Southampton)\nWe prese
nt an update on our calculation of short distance contributions\nto semi-l
eptonic form factors for rare $B$ decays. Results for $B_s \\to\n\\phi \\e
ll^+\\ell^-$ at three lattice spacings of $a^-1 = 1.78$\, 2.38\, and\n2.76
GeV are shown. Our calculations are based on RBC-UKQCD's $N_f =\n2+1$ dom
ain-wall fermion and Iwasaki gauge field ensembles. The heavy\n$b$-quarks
are simulated using the relativistic heavy quark action and\ndomain-wall f
ermions are used for the light quarks.\n\nhttps://conference.ippp.dur.ac.u
k/event/470/contributions/2333/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2333/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Extraction of the bare form factors for the semi-leptonic $B_s$ de
cays
DTSTART;VALUE=DATE-TIME:20160729T171000Z
DTEND;VALUE=DATE-TIME:20160729T173000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2332@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Mateusz Koren (NIC\, DESY Zeuthen)\nThe extraction o
f bare ground-state matrix elements for $B_s \\to K\\ell\\nu$ decay at 2%
precision poses a significant numerical challenge. Especially the B-sector
\, treated in HQET\, is problematic due to large contamination by excited
states combined with the signal-to-noise problem. The numerical setup that
we use provides access to all time separations for both the two-point and
three-point correlation functions of interest\, for several different sme
arings. Using this data\, we show how the extraction is achieved using two
different techniques - the combined fits to two- and three-point correlat
ion functions\, as well as the ratio method (where we compare different po
ssible ratio definitions\, including summed ratios).\n\nhttps://conference
.ippp.dur.ac.uk/event/470/contributions/2332/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2332/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Long-Distance Properties of Landau Gluon and Ghost Propagators an
d Deconfinement
DTSTART;VALUE=DATE-TIME:20160726T190000Z
DTEND;VALUE=DATE-TIME:20160726T200000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2331@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Tereza Mendes (University of São Paulo)\nWe investi
gate numerically the long-distance properties of gluon and \nghost propaga
tors in Landau gauge on the lattice\, for the SU(2) case. By\nconsidering
electric and magnetic gluon propagators at nonzero temperature\, \nwe extr
act Debye screening masses and look for signs of deconfinement around \nth
e critical temperature. Our results are related to the zero-temperature \n
behavior of infrared propagators for comparison.\n\nhttps://conference.ipp
p.dur.ac.uk/event/470/contributions/2331/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2331/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice calculation of the pion transition form factor $\\pi^0 \\t
o \\gamma^* \\gamma^*$
DTSTART;VALUE=DATE-TIME:20160729T171000Z
DTEND;VALUE=DATE-TIME:20160729T173000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2330@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Antoine Gerardin (Institute for Nuclear Physics\, Un
iversity of Mainz)\nWe report on the lattice QCD calculation of the $\\pi^
0 \\to \\gamma^\\ast \\gamma^\\ast$ form factor using two flavors of O(a)-
improved Wilson fermions with photon virtualities in the range $Q^2 \\in [
0-1.5]$~GeV$^2$. Different lattice spacings and pion masses are used to ex
trapolate our result to the physical point. \nFirst\, we check that our re
sults\, once extrapolated to the chiral and continuum limit\, are compatib
le with the chiral anomaly. Then\, the shape of the form factor is compare
d to different phenomenological models proposed in the literature and to e
xperimental data in the single-virtual case when one photon is on-shell. F
rom a phenomenological point of view\, this form factor determines the $\\
pi^0$ pole contribution to hadronic light-by-light (HLbL) scattering in th
e muon $g-2$\,thought to be dominant.\n\nhttps://conference.ippp.dur.ac.uk
/event/470/contributions/2330/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
77
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2330/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Progress on the lattice QCD calculation of rare kaon decays: K+ ->
pi+ l+ l-
DTSTART;VALUE=DATE-TIME:20160728T165000Z
DTEND;VALUE=DATE-TIME:20160728T171000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2329@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Andrew Lawson (University of Southampton)\nThe rare
decays of a kaon into a pion and a lepton/antilepton pair proceed via a fl
avour changing neutral current and therefore first arise in the Standard M
odel only as a second order electroweak interaction. This natural suppress
ion makes these decays sensitive to the effects of potential New Physics.
However the rare decay channels K+ -> pi+ l+ l- are dominated by contribut
ions from long-distance effects\, where the two electroweak processes are
separated by distances over which non-perturbative QCD effects play a sign
ificant role. In this talk I will provide an update on the progress of our
exploratory calculations of the long-distance contributions to K+ -> pi+
l+ l- amplitudes\, which make use of the Domain Wall Fermion ensembles of
the RBC and UKQCD collaborations.\n\nhttps://conference.ippp.dur.ac.uk/eve
nt/470/contributions/2329/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2329/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A worm algorithm for the lattice CP(N-1) model
DTSTART;VALUE=DATE-TIME:20160729T130000Z
DTEND;VALUE=DATE-TIME:20160729T132000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2327@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Tobias Rindlisbacher (ETH Zürich)\nThe CP(N-1) mode
l in 2D is an interesting toy model for 4D QCD as it possesses confinement
\, asymptotic freedom and a non-trivial vacuum structure. Due to the lower
dimensionality and the absence of fermions\, the computational cost for s
imulating 2D CP(N-1) on the lattice is much lower than the one for simulat
ing 4D QCD. However to our knowledge\, no efficient algorithm for simulati
ng the lattice CP(N-1) model has been tested so far\, which also works at
finite density. To this end we propose a new type of worm algorithm which
is appropriate to simulate the lattice CP(N-1) model in a dual\, flux-vari
ables based representation\, in which the introduction of a chemical poten
tial does not give rise to any complications.\n\nhttps://conference.ippp.d
ur.ac.uk/event/470/contributions/2327/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2327/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Resonances in Coupled-Channel Scattering
DTSTART;VALUE=DATE-TIME:20160725T093000Z
DTEND;VALUE=DATE-TIME:20160725T100000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2326@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: David Wilson (University of Cambridge)\nExcited stat
es in hadron physics are seen as resonances in the scattering of lighter s
table hadrons like $\\pi$\, $K$ and $\\eta$. Many decay into multiple fina
l states necessitating coupled-channel analyses. Recently it has become po
ssible to obtain coupled-channel scattering amplitudes from lattice QCD. U
sing large diverse bases of operators it is possible to obtain reliable fi
nite volume spectra at energies where multiple channels are open. Utilisin
g the finite volume formalism proposed by L\\"uscher and extended by sever
al others\, scattering amplitudes can be extracted from the finite volume
spectra. Recent applications will be discussed where the energy dependence
of scattering amplitudes is mapped out in several quantum numbers. These
are then continued to complex energies to extract resonance poles and coup
lings.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2326/
LOCATION:Highfield Campus\, University of Southampton Building 32 (EEE) Ro
om 1015 and Building 67 (Nightingale) Room 1027 via video link
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2326/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thermodynamics of strongly-coupled lattice QCD in the chiral limit
DTSTART;VALUE=DATE-TIME:20160729T161000Z
DTEND;VALUE=DATE-TIME:20160729T163000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2325@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Helvio Vairinhos (ETH Zurich)\nIn the strong couplin
g limit\, n-point functions in lattice QCD with staggered fermions can be
rewritten exactly as traces over constrained configurations of monomers\,
dimers\, and baryon loops covering the spacetime lattice. Worm algorithms
provide efficient global sampling methods over such ensembles\, and are pa
rticularly efficient in the chiral limit. We study the thermodynamics of s
trongly-coupled U(3) and SU(3) lattice QCD with one massless staggered fer
mion using such methods\, and compare the results with the relativistic pi
on gas.\n\nhttps://conference.ippp.dur.ac.uk/event/470/contributions/2325/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 102
7
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2325/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards a non-perturbative calculation of the weak Hamiltonian Wil
son coefficients
DTSTART;VALUE=DATE-TIME:20160728T153000Z
DTEND;VALUE=DATE-TIME:20160728T155000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2324@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Mattia Bruno (Brookhaven Natl. Lab.)\nPerturbation t
heory plays a significant role in some lattice calculations\, in particula
r in those related to weak processes. Here we discuss the possibility to c
alculate the Wilson Coefficients of the leading order electro-weak effecti
ve Hamiltonian of the Standard model to all order in the strong coupling c
onstant\, using lattice simulations.\n\nhttps://conference.ippp.dur.ac.uk/
event/470/contributions/2324/
LOCATION:Highfield Campus\, University of Southampton Building 67 Room 100
3
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2324/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Applications of Gradient flow to Non-perturbative renormalization
of quark bi-linears
DTSTART;VALUE=DATE-TIME:20160726T190000Z
DTEND;VALUE=DATE-TIME:20160726T200000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2323@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Kostas Orginos (College of William and Mary/JLAB)\nR
esults of a non-perturbative determination\nof RI-MOM renormalization cons
tants for smeared quark bi-linear operators are presented.\nThese operator
s are smeared using the gradient flow\, enabling the smearing\nscale to be
fixed in physical units. As a result\, smeared matrix elements\nare free
of power divergences in the lattice spacing\, which allows easier\ncontrol
of the continuum limit of these matrix elements. \nPotential applications
to calculations of twist-2 matrix elements are discussed.\n\nhttps://conf
erence.ippp.dur.ac.uk/event/470/contributions/2323/
LOCATION:Highfield Campus\, University of Southampton
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2323/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kaon Kaon scattering at maximal isospin from $N_f=2+1+1$ twisted m
ass lattice QCD
DTSTART;VALUE=DATE-TIME:20160726T153000Z
DTEND;VALUE=DATE-TIME:20160726T155000Z
DTSTAMP;VALUE=DATE-TIME:20190915T204211Z
UID:indico-contribution-470-2322@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Christopher Helmes (HISKP Universität Bonn)\nWe pre
sent results for the interaction of two Kaons at maximal\nisospin. The cal
culation is based on 2+1+1 flavour gauge\nconfigurations generated by the
ETM Collaboration featuring\npion masses ranging from about 230 MeV to 450
MeV at three\nvalues of the lattice spacing. The elastic scattering lengt
h\n$a_0$ is calculated at several values of the bare\nstrange quark and li
ght quark masses. Chiral extrapolations\nto the physical point are present
ed and compared to other lattice\nresults.\n\nhttps://conference.ippp.dur.
ac.uk/event/470/contributions/2322/
LOCATION:Highfield Campus\, University of Southampton Building B2a Room 20
65
URL:https://conference.ippp.dur.ac.uk/event/470/contributions/2322/
END:VEVENT
END:VCALENDAR