Lattice 2024

28 Jul 2024, 16:30 → 3 Aug 2024, 14:00 Europe/London

Simon Hands (University of Liverpool)

The 41st Lattice Conference will take place at the University of Liverpool, United Kingdom, from July 28th to August 3rd, 2024.

Originally started as a forum for particle physicists to discuss recent developments in lattice gauge theory, especially lattice QCD describing the strong force between quarks and gluons, nowadays the conference is the largest of its type and has grown to include areas like algorithms and machine architectures, quantum computing, physics beyond the Standard Model, and strongly interacting phenomena in low-dimensional systems.

Confirmed plenary speakers:

• Georg Bergner (Friedrich-Schiller-Universität Jena)
• Shohini Bhattacharya (Los Alamos National Laboratory)
• Shailesh Chandrasekharan (Duke University)
• Christine Davies (University of Glasgow)
• Felix Erben (CERN)
• Anthony Grebe (Fermilab)
• Despina Hatzifotiadou (Istituto Nazionale di Fisica Nucleare - sezione di Bologna and CERN)
• Tie-Jiun Hou (University of South China 南华大学)
• Will Jay (Massachusetts Institute of Technology)
• Tamás Kovács (Eötvös Loránd Tudományegyetem)
• Nilmani Mathur (Tata Institute of Fundamental Research, Mumbai)
• Colin Morningstar (Carnegie Mellon University)
• Swagato Mukherjee (Brookhaven National Laboratory)
• Scott Lawrence (Los Alamos National Laboratory)
• Christian Schmidt (Universität Bielefeld)
• Srimoyee Sen (Iowa State University)
• David Tong (University of Cambridge)
• Anders Tranberg (Universitetet i Stavanger)
• Justus Tobias Tsang (CERN)
• Mark Whitehead (University of Glasgow)

The plenary program will also include a special session on 50 years of lattice QCD, featuring John Kogut and Jan Smit, as well as a panel discussion on open data & reproducibility, chaired by Ed Bennett.

Conference sponsors:

 

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Code of Conduct

KingsCampsFlyer.pdf

University of Liverpool Campus Map

Sunday, 28 July

16:30 → 19:30 Welcome / Arrival

Monday, 29 July

09:00 → 10:30 Plenary

09:00 Opening and welcome

09:15 Status and outlook of quark flavour physics

In recent years there has been impressive progress in quark flavour physics, with current efforts tackling complicated quantities such as for example inclusive decays, decays to QCD-unstable final states and radiative decays. At the same time current lattice flavour physics results are receiving a lot of attention from outside the lattice community. This requires careful scrutiny, even for well explored quantities.

I will review the status of flavour physics observables and, in the context of heavy flavours, suggest possible benchmark quantities that could allow to better compare intermediate results. These can in turn be used to investigate the origin of existing (and possible future) tensions.

Speaker: J. Tobias Tsang (CERN)

10:00 Recent highlights from the LHCb experiment

I will present a selection of recent results from the LHCb experiment, with a focus on topics that of interest at Lattice 2024. This will include highlights from the heavy flavour spectroscopy programme, with observations of new hadrons (both exotic and more standard in nature).

Speaker: Mark Whitehead (University of Glasgow)

10:30 → 11:15 Break and walk to Guild of Students

11:15 → 13:15 Parallel

13:15 → 14:15 Lunch

14:15 → 16:15 Parallel

16:15 → 17:00 Break and walk to Yoko Ono Lennon Centre

17:00 → 18:30 Plenary

17:00 Machine-learning approaches to accelerating lattice simulations

The last decade has seen an explosive growth of interest in exploiting developments in machine learning to accelerate lattice QCD calculations. On the sampling side, generative models are a promising approach to mitigating critical slowing down and topological freezing. Meanwhile, signal-to-noise problems have been shown to be improvable by the use of optimized improved observables. Both techniques can be made free of bias, resulting in trustworthy but reduced statistical errors. This talk reviews recent developments in this field.

Speaker: Scott Lawrence (Los Alamos National Laboratory)

17:30 Approaches to the Inverse Problem

In this talk, I will review the physics context for and recent approaches to the inverse problem of spectral reconstruction.

Speaker: William Jay (MIT)

18:00 The International Particle Physics Outreach Group (IPPOG) - Engaging the world with science

The pillar for outreach in particle physics, which is nowadays an integral part of our work as researchers, is IPPOG, the International Particle Physics Outreach Group. IPPOG is a network of scientists, science educators and communication specialists working across the globe in informal science education and public engagement for particle physics. The flagship activity of IPPOG is the International Particle Physics Masterclasses programme, to which other activities such as the Worldwide Data Day, the International Muon Week and International Cosmic Day organisation have been added. IPPOG members also participate in a wide range of events: public talks, festivals, exhibitions, teacher training, student competitions, and open days at local institutes. A resource database has also been developed containing a wealth of material for the dissemination of particle physics. In this talk the history and evolution of IPPOG will be presented briefly, and its various activities will be discussed, with emphasis on the masterclasses, which have been expanding both geographically and in scope during the years.

Speaker: Despina Hatzifotiadou (INFN Bologna)

Tuesday, 30 July

09:00 → 10:30 Plenary

09:00 From scattering towards multi-hadron weak decays

Hadron spectroscopy and the study of QCD resonances on the lattice has seen rapid advancements in recent years. This is thanks to new and refined analytical formalisms, improved computational strategies and last but not least a substantial community effort in pushing the boundaries to more complicated resonant channels and simulations at physical quark masses. In this talk I present a selection of recent lattice QCD scattering computations and give an outlook on how a fundamental understanding of resonances in lattice QCD is a key component in a wide range of computations that can be compared to experimental results and as such serve as crucial tests of the Standard Model.

Speaker: Felix Erben (CERN)

09:45 Muon g-2

Speaker: Christine Davies (University of Glasgow)

10:30 → 11:15 Break and walk to Guild of Students

11:15 → 12:45 Parallel

12:45 → 13:45 Lunch

13:45 → 15:45 Parallel

15:45 → 16:15 Break

16:15 → 17:15 Parallel

17:15 → 19:15 Poster session and reception

Wednesday, 31 July

09:00 → 10:30 Plenary

09:00 Qubit Regularization: Asymptotic Freedom via New Renormalization Group flows

In order to study quantum field theories on a quantum computer we need to begin with lattice theories with a finite dimensional local Hilbert space. We view this as a new type of regularization of quantum field theories, and refer to it as qubit regularization, which can be explored both in Minkowski and Euclidean spaces. Such a finite dimensional regularization of a quantum field theory was proposed long ago as a general idea for many quantum field theories and was called the D-theory approach. Here the local Hilbert spaces were allowed to grow via an additional dimension if needed. The D-theory approach often provides a very good effective field theory of the original theory with a small additional dimension. However, we have recently discovered examples in $1+1$ dimensions where asymptotic freedom seems to emerge exactly even with a strictly finite dimensional local Hilbert space. But the renormalization group flow to the UV fixed point in these examples is quite novel. One starts with a critical quantum field theory which is quite different from the desired continuum asymptotically free quantum field theory. A relevant perturbation then takes us arbitrarily close to the desired theory. These examples implore us to understand if other asymptotically free quantum field theories including Yang Mills theories and QCD can also emerge via similar RG flows within a strict finite dimensional local Hilbert space. Qubit regularized Hilbert spaces of gauge theories do contain both confined and deconfined phases. The challenge is to discover Hamiltonians in the qubit regularized Hilbert space, which may be different from traditional Hamiltonians, but have interesting critical phase transitions between the phases and are governed by novel RG flows.

Speaker: Shailesh Chandrasekharan (Duke University)

09:30 The ties between lattice field theory and topological materials

Speaker: Srimoyee Sen (Iowa State University)

10:00 Symmetric Mass Generation

Speaker: David Tong (Cambridge)

10:30 → 11:15 Break and walk to Guild of Students

11:15 → 13:00 Parallel

13:00 → 13:30 Box lunch pickup

13:30 → 17:45 Excursions

Thursday, 1 August

09:00 → 11:00 Parallel

11:00 → 11:30 Break

11:30 → 12:30 Parallel

12:30 → 14:00 Lunch and walk to Yoko Ono Lennon Centre

14:00 → 15:15 Plenary

14:00 Ken Wilson Award

14:30 tbc (non-equilibrium QFT)

Speaker: Anders Tranberg (University of Stavanger, Norway)

15:15 → 15:45 Break

15:45 → 16:30 Plenary

15:45 50 years of lattice QCD

Speakers: Jan Smit (University of Amsterdam), John Kogut (USDOE and University of Maryland)

16:30 → 19:30 Banquet

Friday, 2 August

09:00 → 10:30 Plenary

09:00 Selected topics on the QCD phase diagram at finite temperature and density

I will give an overview on recent results on the QCD phase diagram at finite temperature and density.

Speaker: Christian Schmidt (Universitaet Bielefeld)

09:45 Panel discussion on open data and reproducibility

Speakers: Andrea Athenodorou (The Cyprus Institute), Anna Hasenfratz (University of Colorado), Carsten Urbach (University of Bonn), Ed Bennett (Swansea University), Louise Chisholm (University College London)

10:30 → 11:15 Break and walk to Guild of Students

11:15 → 13:15 Parallel

13:15 → 14:15 Lunch

14:15 → 16:15 Parallel

16:15 → 17:00 Break and walk to Yoko Ono Lennon Centre

17:00 → 18:30 Plenary

17:00 Hadron Structure via PDFs

Parton Distribution Functions (PDFs) are essential ingredients in realistic cross-section calculations within the framework of perturbative QCD. They describe the x-dependent structure of hadrons based on global analyses of hard-scattering measurements. PDFs play a crucial role in the search for new physics and precision measurements at hadron colliders, making the control of PDF uncertainties paramount. A limitation of PDFs from global analyses is their larger uncertainty in regions where experimental data is scarce. Starting from first principle operator definitions of PDFs, PDF-related quantities are computed in the framework of Lattice QCD, and they provide comparisons and supplements for PDF from global analysis. This presentation will discuss the current status and future prospects of PDF global analyses incorporating Lattice QCD inputs, highlighting their potential to enhance our understanding of hadron structure.

Speaker: Tie-Jiun Hou (University of South China)

17:30 Hadron structure via GPDs

Recent advancements have facilitated the approximate computation of light-cone correlation functions in lattice QCD through the evaluation of their Euclidean counterparts. In this presentation, we will provide a brief overview of these significant developments and discuss their direct implications for Generalized Parton Distributions (GPDs). Additionally, we will highlight the importance of GPDs in understanding the internal structure of hadrons.

Speaker: Shohini Bhattacharya (Los Alamos National Laboratory)

18:00 Lattice QCD in the Frontier of Electron Ion Colliders

In our quest to uncover the secrets of hadrons, a groundbreaking tool emerges—the Electron Ion Collider (EIC). Set to be constructed at the Brookhaven National Laboratory, the EIC will be one of the world's largest and most advanced accelerator facilities. With unmatched resolving power and intensity, it acts as a powerful microscope, allowing us to explore how hadrons emerge from the fundamental particles—quarks and gluons.

The synergy between real-world observations from the EIC and the virtual laboratory of Lattice Quantum Chromodynamics (Lattice QCD) is crucial, offering a comprehensive understanding of how these fundamental particles govern the emergence and properties of hadrons. Together, they promise to reveal the underlying components and dynamics, deepening our knowledge and marking a significant leap forward in the exploration of particle physics. This talk will highlight the pioneering and essential role of Lattice QCD in the upcoming EIC frontier.

Speaker: Swagato Mukherjee (Brookhaven National Laboratory)

Saturday, 3 August

09:00 → 10:30 Plenary

09:00 Hadron Spectroscopy from lattice QCD: current status and future

From the early days of lattice QCD, hadron spectroscopy has been an integral part of it. With improved control over statistical and systematic errors, ground states of many hadrons are now very well determined by lattice QCD calculations. Significant progress has also been made in excited state calculations. These advancements, along with developments in amplitude analysis formalisms, have greatly enhanced the study of multi-hadron scatterings. Lattice QCD calculations are making excellent contributions to the study of exotic hadrons and can help decipher their structures, potentially aiding in the discovery of many new hadrons in the future. However, lattice QCD-based studies of nuclear physics have not yet reached the same level of precision, and much progress is still needed. In this talk, I will provide an overview of the current status of hadron spectroscopy, including exotic hadrons, and discuss future prospects and implications.

Speaker: Nilmani Mathur (Tata Institute of Fundamental Research)

09:45 Prospects for lattice field theory beyond the Standard Model

This talk summarises the explorations of theories beyond the Standard Model using lattice simulation methods. After a brief comment on the current status of the Standard Model extensions, the essential contribution made by numerical simulations in various approaches will be discussed. However, this also poses new challenges for simulation methods. The interplay with new theories gives rise to more general theoretical considerations that establish a close relationship with investigations of fundamental concepts such as gauge/gravity duality, confinement, or renormalisation group flow. The investigation of theories beyond standard QCD applications therefore opens up a broader perspective for our fundamental understanding, which could ultimately also lead to alternative ways of thinking about the shortcomings of the Standard Model

Speaker: Georg Bergner (University of Jena)

10:30 → 11:00 Break

11:00 → 12:30 Plenary

11:00 Update on Glueballs

An update on glueball studies in lattice QCD and from some other methods is presented. The recent BES III announcement of a pseudoscalar glueball candidate is discussed.

Speaker: Colin Morningstar (Carnegie Mellon University)

11:30 Nuclear Matrix Elements for Neutrinoless Double-Beta Decay

Neutrinoless double-beta decay ($0\nu\beta\beta$) is a hypothesized decay mode of certain nuclear isotopes that, if observed, would demonstrate that neutrinos are their own antiparticles. Interpreting experimental measurements of $0\nu\beta\beta$ half-lives in terms of neutrino properties requires knowledge of the nuclear matrix elements encoding the hadronic physics involved in these decays. These matrix elements are currently estimated with nuclear models which produce large systematic uncertainties and are currently a major limiting factor in experimental searches. Nuclear effective field theory (EFT) can be used to express matrix elements of relevance to $0\nu\beta\beta$ in terms of a set of low-energy constants (LECs). Once these LECs are constrained using lattice QCD, they can inform the corresponding nuclear-structure calculations in larger nuclei. This talk will discuss recent developments in lattice QCD calculations of pion and two-nucleon matrix elements of relevance to $0\nu\beta\beta$ decay proceeding by both short- and long-distance mechanisms and the implications of these calculations for matching the relevant LECs of the EFTs.

Speaker: Anthony Grebe (Fermi National Accelerator Laboratory)

12:00 $U(1)_A$ breaking in hot QCD in the chiral limit

We propose a simple instanton-based random matrix model of hot QCD that in the quenched case precisely reproduces the distribution of the lowest lattice overlap Dirac eigenvalues. Even after including dynamical quarks the model can be easily simulated in volumes and for quark masses that will be out of reach for direct lattice simulations in the foreseeable future. Our simulations show that quantities connected to the $U(1)_A$ and $SU(N_f)_A$ chiral symmetry are dominated by eigenvalues in a peak of the spectral density that becomes singular at zero in the thermodynamic limit. This spectral peak turns out to be produced by an ideal instanton gas. By generalizing Banks-Casher type integrals for the singular spectral density, definite predictions can be given for physical quantities that are essential to test chiral symmetry breaking, but presently impossible to compute reliably with direct lattice simulations.

Speaker: Tamas G. Kovacs (Department of Physics and Astronomy, Eotvos University, Budapest)

12:30 → 13:15 Box lunch pickup