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SUMMARY:Internal Seminar by Sabya Chatterjee
DTSTART;VALUE=DATE-TIME:20210129T140000Z
DTEND;VALUE=DATE-TIME:20210129T150000Z
DTSTAMP;VALUE=DATE-TIME:20211129T090200Z
UID:indico-event-986@conference.ippp.dur.ac.uk
DESCRIPTION:\nTittle:\n\nNeutrino non-standard interactions: a possible so
lution to the NOvA and T2K tension\n\nAbstract:\n\nThe latest data of the
two long-baseline accelerator experiments NOνA and T2K\, analysed in the
standard 3-flavor scenario\, display a discrepancy. A mismatch in the det
ermination of the standard CP-phase $\\delta_{CP}$ extracted by the two e
xperiments is evident in the normal neutrino mass ordering. While NOνA p
refers values close to $\\delta_{CP}$ ~ 0.8$\\pi$\, T2K identifies values
of $\\delta_{CP}$ ~ 1.4$\\pi$. Such two estimates are in disagreement at m
ore than 90% C.L. for 2 d.o.f.. We show that such a tension can be resolv
ed if one hypothesizes the existence of complex neutral-current non-standa
rd interactions (NSI) of the flavor changing type involving the $e−\\mu
$ or the $e−\\tau$ sectors with couplings |$\\epsilon_{e\\mu}$| ∼ |$\
\epsilon_{e\\tau}$ | ∼ 0.2. We find that in case of normal mass ordering
there is a 2.1$\\sigma$ preference of the non-zero NSI coupling |$\\epsil
on_{e\\mu}$| and 1.9$\\sigma$ preference of |$\\epsilon_{e\\tau}$|. Remark
ably\, in the presence of such NSI\, both experiments point towards the sa
me common value of the standard CP-phase $\\delta_{CP}$ ~ 3$\\pi/2$. Our a
nalysis also highlights an intriguing preference for maximal CP-violation
in the non-standard sector with the dynamical NSI\nCP-phases having best f
it close to $\\phi_{e\\mu}$ ~ $\\phi_{e\\tau}$ ~ 3$\\pi/2$. Although not v
ery strong this might be a possible sign of physics beyond the Standard Mo
del. It is also worth to mention that in case of inverted ordering the pre
ference of non-zero NSI couplings |$\\epsilon_{e\\mu}$| and |$\\epsilon_{e
\\tau}$| lies only at 1$\\sigma$ confidence level respectively.\n\n \n\n
Zoom link: IPPP Seminars (Friday at 2 pm UK time)\n\nhttps://durhamunive
rsity.zoom.us/j/99420124988?pwd=ZEFLSDB3THJtaWZOTU54R25mT1NuZz09\n\nMeetin
g ID: 994 2012 4988\n\nhttps://conference.ippp.dur.ac.uk/event/986/
URL:https://conference.ippp.dur.ac.uk/event/986/
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