BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Yang Mills short distance potential and perturbation theory
DTSTART;VALUE=DATE-TIME:20190617T074000Z
DTEND;VALUE=DATE-TIME:20190617T080000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420572@indico.cern.ch
DESCRIPTION:Speakers: Rainer Sommer (NIC @ DESY)\nWe compute the coupling
$\\alpha_{qq}$ defined in terms\nof the static quark force by simulating t
he SU(3) Yang Mills \ntheory at lattice spacings down to $10^{-2}$fm\, kee
ping the \nvolume large. Open boundary conditions avoid the freezing \nof
topology. We can thus investigate the applicability of \nperturbation theo
ry\, extract the pure gauge $\\Lambda$-parameter\nand compare to $\\Lambda
$ obtained with other methods.\n\nhttps://indico.cern.ch/event/764552/cont
ributions/3420572/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3420572/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Update on the improved lattice calculation of direct CP-violation
in K decays
DTSTART;VALUE=DATE-TIME:20190621T091000Z
DTEND;VALUE=DATE-TIME:20190621T093000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3421220@indico.cern.ch
DESCRIPTION:Speakers: Christopher Kelly (Columbia University)\nWe provide
an update on the RBC & UKQCD lattice calculation of the measure of Standar
d Model direct CP-violation in kaon decays\, \\epsilon'.\n\nhttps://indico
.cern.ch/event/764552/contributions/3421220/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3421220/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mesonic correlators at non-zero baryon chemical potential
DTSTART;VALUE=DATE-TIME:20190619T020000Z
DTEND;VALUE=DATE-TIME:20190619T022000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420415@indico.cern.ch
DESCRIPTION:Speakers: Aleksandr Nikolaev (Swansea University)\nIn order to
study the fate of mesons in thermal QCD at finite baryon chemical potenti
al\, we consider light mesonic correlation functions using the Taylor expa
nsion to O$\\Bigl( (\\mu/T)^2 \\Bigr)$\, in both the hadronic and quark-gl
uon plasma phases. We use the FASTSUM anisotropic fixed-scale lattices wit
h N$_f$=2+1 flavors of Wilson fermions. We find that mesonic correlators a
re sensitive to finite-density corrections and that the second-order terms
notice the chiral crossover in the vector and axial-vector channels.\n\nh
ttps://indico.cern.ch/event/764552/contributions/3420415/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420415/
END:VEVENT
BEGIN:VEVENT
SUMMARY:2019 update of $\\varepsilon_K$ with lattice QCD inputs
DTSTART;VALUE=DATE-TIME:20190618T101000Z
DTEND;VALUE=DATE-TIME:20190618T103000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3421209@indico.cern.ch
DESCRIPTION:Speakers: Weonjong Lee (Seoul National University)\nWe report
recent progress in determining $\\varepsilon_K$\, the indirect\nCP violati
on parameter in neutral kaons\, calculated using lattice QCD\ninputs inclu
ding $\\hat{B}_K$\, $\\xi_0$\, $\\xi_2$\, $|V_{us}|$\,\n$|V_{cb}|$\, and $
m_c(m_c)$. Recently Belle has updated results for\nexclusive $|V_{cb}|$ us
ing both CLN and BGL method. They are used in\nthis analysis.\n\nhttps://
indico.cern.ch/event/764552/contributions/3421209/
LOCATION: Foyer
URL:https://indico.cern.ch/event/764552/contributions/3421209/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Charmonium contribution to $B \\to K l^+l^-$: testing the factoriz
ation approximation on the lattice
DTSTART;VALUE=DATE-TIME:20190618T070000Z
DTEND;VALUE=DATE-TIME:20190618T072000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3421213@indico.cern.ch
DESCRIPTION:Speakers: Katsumasa NAKAYAMA ()\nWe calculate the amplitude of
$B \\to K l^+l^-$ through the charmonium intermediate state.\nIt may give
a significant contribution near the charmonium resonances. \nAway from th
e resonances\, one needs a reliable theoretical estimate for the search of
potential new physics\, and our lattice calculation provides a test of th
e factorization approximation\, which has been used in previous phenomenol
ogical analyses.\nWe focus on the low $q^2$ region with a b-quark mass sma
ller than its physical value.\nWe use the Mobius domain-wall fermion for h
eavy and light quarks. The lattice ensemble is also generated with 2+1 fla
vors of Mobius domain-wall fermions at a lattice spacing 0.055 fm.\n\nhttp
s://indico.cern.ch/event/764552/contributions/3421213/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3421213/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Calculation of the $K_L - K_S$ mass difference for physical quark
masses
DTSTART;VALUE=DATE-TIME:20190621T081000Z
DTEND;VALUE=DATE-TIME:20190621T083000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3421215@indico.cern.ch
DESCRIPTION:Speakers: Bigeng Wang (Columbia University)\nWe will present t
he status of our calculation of the difference between the masses of the l
ong- and short-lived neutral K mesons\, $\\Delta m_K$\, predicted by the S
tandard Model. This calculation is performed on an ensemble of 152\, $64^
3 \\times 128$ gauge configurations with an inverse lattice spacing of 2.3
6 GeV and physical quark masses. The results from different methods of an
alysis and our progress toward obtaining a final result will be discussed.
\n\nhttps://indico.cern.ch/event/764552/contributions/3421215/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3421215/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Leptonic decays of $B_{(s)}$ and $D_{(s)}$ using the OK action
DTSTART;VALUE=DATE-TIME:20190618T101000Z
DTEND;VALUE=DATE-TIME:20190618T103000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3421211@indico.cern.ch
DESCRIPTION:Speakers: Benjamin Jaedon Choi (Seoul National University)\nWe
present recent progress in the lattice calculation of leptonic decay cons
tants for $B_{(s)}$ and $D_{(s)}$ mesons using the Oktay-Kronfeld (OK) act
ion for the charm and bottom quarks. We use MILC HISQ ensembles and the HI
SQ action for the light spectator quark. Results for spectrum of $B_{(s)}$
\, $D_{(s)}$\, $B^\\ast_{(s)}$\, $D^\\ast_{(s)}$ mesons with the nonpertur
batively tuned heavy quark masses will be presented. We will also present
results for the SU(3) flavor breaking ratios $f_{B_s}/f_B$ and $f_{D_s}/f_
D$ that are independent of the renormalization constant that is being calc
ulated.\n\nhttps://indico.cern.ch/event/764552/contributions/3421211/
LOCATION: Foyer
URL:https://indico.cern.ch/event/764552/contributions/3421211/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Meson masses in external magnetic fields with HISQ fermions
DTSTART;VALUE=DATE-TIME:20190620T064000Z
DTEND;VALUE=DATE-TIME:20190620T070000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420451@indico.cern.ch
DESCRIPTION:Speakers: Xiaodan Wang (CCNU)\nWe studied the temporal correla
tion functions for mesons in different channels in (2+1)-flavor QCD in the
presence of external magnetic fields at zero temperature. The simulations
were performed on $32^3 \\times 96$ lattices using the Highly Improved St
aggered Quarks (HISQ) action with $m_{\\pi}$ around 230 MeV. The strength
of magnetic fields range in $ 0 \n\nhttps://indico.cern.ch/event/764552/co
ntributions/3420451/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420451/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Baryon bag simulation of QCD in the strong coupling limit
DTSTART;VALUE=DATE-TIME:20190619T035000Z
DTEND;VALUE=DATE-TIME:20190619T041000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420423@indico.cern.ch
DESCRIPTION:Speakers: Oliver Orasch (University of Graz)\nWe explore the p
ossibility of a simulation of strong coupling QCD in terms of baryon bags.
Since the gauge action is missing in the strong coupling partition sum\,
the integration over the gauge group is possible and the remaining Grassma
nn integral can be mapped to a statistical system of monomers\, dimers and
loops. Rather recently it was shown that the contributions from the baryo
ns\, i.e.\, the tri-quark monomers\, dimers and loops\, can be collected i
n so-called baryon bags. Within the bags the baryons propagate freely wher
eas the rest of the lattice is solely filled with interacting meson terms\
, i.e.\, quark and di-quark monomers and dimers. We perform a simulation d
irectly in the baryon bag language and show first results in two dimension
s.\n\nhttps://indico.cern.ch/event/764552/contributions/3420423/
LOCATION: Shimao 1A+1B
URL:https://indico.cern.ch/event/764552/contributions/3420423/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Logarithmic Corrections to $a^2$ scaling in lattice Yang Mills the
ory
DTSTART;VALUE=DATE-TIME:20190617T064000Z
DTEND;VALUE=DATE-TIME:20190617T070000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3425931@indico.cern.ch
DESCRIPTION:Speakers: Nikolai Husung (Deutsches Elektronen-Synchrotron DES
Y)\nWe analyse the leading logarithmic corrections to the $a^2$ scaling of
lattice artefacts in QCD\, following the seminal work of Balog\, Niederma
yer and Weisz in the O(n) non-linear sigma model. Limiting to contribution
s from the action\, the leading logarithmic corrections can be determined
by the anomalous dimensions of a minimal on-shell basis of mass-dimension
6 operators. We present results for the lattice SU(N) pure gauge theory. I
n this theory the logarithmic corrections reduce the cutoff effects. These
computations are the first step towards a study of full lattice QCD at O(
$a^2$)\, which is in progress.\n\nhttps://indico.cern.ch/event/764552/cont
ributions/3425931/
LOCATION: Shimao 1A+1B
URL:https://indico.cern.ch/event/764552/contributions/3425931/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The order of phase transition in three flavor QCD with background
magnetic field in crossover regime
DTSTART;VALUE=DATE-TIME:20190620T062000Z
DTEND;VALUE=DATE-TIME:20190620T064000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420454@indico.cern.ch
DESCRIPTION:Speakers: Akio Tomiya (RIKEN BNL Research Center)\nWe investig
ate the order of phase transition in\nthree flavor QCD with a background $
U(1)$ magnetic field using\nthe standard staggered action with the plaquet
te gauge action.\nWe perform simulations for three volumes $N_\\sigma = 8\
,16\,24$ with fixed mass $ma=0.030$ and temporal extent $N_\\tau=4$\, whic
h is expected to show crossover for vanishing magnetic field.\nWe apply ph
ysically same magnitude of magnetic field $\\hat{b}=0.9=\\sqrt{2\\pi N_b/N
_\\sigma^2}$ for each volume. We measure the chiral condensates and \nPoly
akov loop and calculate their susceptibility and Binder cumulant.\nWe find
that the transition becomes first order like transition with hysteresis i
n the Monte-Carlo history\nfrom crossover for non-zero magnetic field on t
he system.\n\nhttps://indico.cern.ch/event/764552/contributions/3420454/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420454/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Exploring the QCD phase diagram via reweighting from isospin chemi
cal potential
DTSTART;VALUE=DATE-TIME:20190620T083000Z
DTEND;VALUE=DATE-TIME:20190620T085000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420462@indico.cern.ch
DESCRIPTION:Speakers: Sebastian Schmalzbauer (Goethe University Frankfurt
am Main)\nWe investigate the QCD phase diagram close to the isospin chemic
al potential axis. Simulations directly along this axis are not hindered b
y the sign problem and pion condensation can be observed at high enough va
lues of the isospin chemical potential. We study how the related phase bou
ndary evolves in the baryon and strangeness chemical potential directions
via reweighting in the quark chemical potentials and discuss our results.
Furthermore\, we develop an alternative method to approach nonzero baryon
chemical potentials. This involves simulations including auxiliary quarks
of an extended isospin doublet and decoupling them by increasing their mas
s\, again via reweighting.\n\nhttps://indico.cern.ch/event/764552/contribu
tions/3420462/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420462/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Axial U(1) symmetry and mesonic correlators at high temperature in
$N_f=2$ lattice QCD
DTSTART;VALUE=DATE-TIME:20190617T091000Z
DTEND;VALUE=DATE-TIME:20190617T093000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420430@indico.cern.ch
DESCRIPTION:Speakers: Kei Suzuki (JAEA)\nWe measure the connected and disc
onnected mesonic correlators and\nscreening masses in the high-temperature
phase of $N_f=2$ QCD. Gauge\nensembles are generated with Mobius domain-w
all fermions\, while the\nobservables are calculated with a reweighting to
achieve more precise\nchiral symmetry. We confirm the restoration of axia
l $U(1)$ symmetry for\nsmall quark masses. At a larger quark mass\, the $U
(1)_A$ is broken and\nlong-distance correlations are observed in the isosp
in singlet channels.\n\nhttps://indico.cern.ch/event/764552/contributions/
3420430/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420430/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Study of the pion-pion scatterings with a combination of all-to-al
l propagators and the HAL QCD method
DTSTART;VALUE=DATE-TIME:20190619T035000Z
DTEND;VALUE=DATE-TIME:20190619T041000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420489@indico.cern.ch
DESCRIPTION:Speakers: Yutaro Akahoshi (Yukawa Institute for Theoretical Ph
ysics\, Kyoto University)\nIn this talk\, we show recent developments in t
he HAL QCD method including quark annihilation processes. We apply the hyb
rid method for all-to-all propagators\, which combines a low-mode spectral
decomposition of the quark propagator and noisy estimators for remaining
high modes\, to the HAL QCD potential for the first time. Using this comb
ination\, we investigate the $I=1\,2$ $\\pi \\pi$ scatterings at $m_{\\pi}
\\approx 870$ MeV. From these studies\, we confirm that the hybrid method
works for the potential\, but it is also revealed that it needs large num
erical costs for sufficient precision if there are quark annihilation cont
ributions. We also discuss a promising calculation strategy\, which may ac
hieve both small numerical costs and good precision.\n\nhttps://indico.cer
n.ch/event/764552/contributions/3420489/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3420489/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Rho Resonance Properties from N_f=2+1+1 Lattice QCD
DTSTART;VALUE=DATE-TIME:20190618T093000Z
DTEND;VALUE=DATE-TIME:20190618T095000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420491@indico.cern.ch
DESCRIPTION:Speakers: Martin Ueding (University of Bonn\, Germany)\nWe pre
sent results of our study of the rho resonance properties based on\nN_f=2+
1+1 gauge configurations produced by the ETMC. We investigate the p-wave\n
phase shift for a range of pion mass values from about 200 to about 400 Me
V and\nfor three values of the lattice spacing. We perform an extrapolatio
n to the\nchiral and continuum limit and extract resonance mass and width
at the physical\npoint.\n\nhttps://indico.cern.ch/event/764552/contributio
ns/3420491/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3420491/
END:VEVENT
BEGIN:VEVENT
SUMMARY:GPUs for Lattice Field Theory
DTSTART;VALUE=DATE-TIME:20190620T031500Z
DTEND;VALUE=DATE-TIME:20190620T040000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428328@indico.cern.ch
DESCRIPTION:Speakers: Kate Clark (NVIDIA)\nThe past ten years has seen GPU
s evolve from a niche architecture to the de facto parallel computing plat
form in HPC. We report on the latest developments in the use of GPUs for
lattice field theory computations\, with focus on algorithmic and scaling
work by the community.\n\nhttps://indico.cern.ch/event/764552/contribution
s/3428328/
LOCATION: Wuchang + Hankou
URL:https://indico.cern.ch/event/764552/contributions/3428328/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Accessing flavor-singlet quark and gluon parton distributions from
lattice QCD
DTSTART;VALUE=DATE-TIME:20190619T012000Z
DTEND;VALUE=DATE-TIME:20190619T014000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420530@indico.cern.ch
DESCRIPTION:Speakers: Jianhui Zhang (Beijing Normal University)\nRecent ye
ars have witnessed rapid progress on computing parton distribution functio
ns (PDFs) from lattice QCD. Such computations have been focused on the iso
vector quark PDFs which do not involve mixing with gluon PDFs and therefor
e are the easiest to calculate. In this talk\, I present recent developmen
ts that allow us to access flavor-singlet quark PDFs as well as gluon PDFs
from lattice QCD.\n\nhttps://indico.cern.ch/event/764552/contributions/34
20530/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420530/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice "Cross-Sections" - Pion PDFs from Pseudo-PDFs and Pseudo-S
tructure Functions
DTSTART;VALUE=DATE-TIME:20190619T022000Z
DTEND;VALUE=DATE-TIME:20190619T024000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420533@indico.cern.ch
DESCRIPTION:Speakers: Colin Egerer (College of William and Mary)\nA genera
l framework for the study of hadronic structure from Lattice QCD\, dubbed
"good lattice cross-sections"\, leverages QCD collinear factorization and
ideas from the global PDF fitting community to reliably extract the full x
-dependence of PDFs from the lattice. The calculation of pseudo-PDFs and g
auge invariant two-current correlations within a hadron are two establishe
d realizations of this framework. In this presentation\, we highlight rece
nt results for pion PDFs obtained through each of these calculational sche
mes. Results are presented on several lattice ensembles\, thereby addressi
ng finite-volume\, discretization and quark mass effects in the extracted
distributions. Consideration is given to discretization effects and the po
tential to simultaneously analyze each data set.\n\nhttps://indico.cern.ch
/event/764552/contributions/3420533/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420533/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hyperon couplings from $N_f = 2 + 1$ lattice QCD
DTSTART;VALUE=DATE-TIME:20190620T062000Z
DTEND;VALUE=DATE-TIME:20190620T064000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420527@indico.cern.ch
DESCRIPTION:Speakers: Simon Weishäupl ()\nThe experimentally well known n
ucleon axial coupling $g_A$ has been computed extensively on the lattice a
nd serves as a benchmark quantity for lattice calculations. The axial coup
lings for the other octet baryons (hyperons)\, like e.g. $\\Sigma$ and $\\
Xi$ baryons are less well known. We will present not only results for the
hyperon axial charges but also for other isovector charges\, e.g.\, the te
nsor charges. Our calculations were performed on a set of $N_f = 2 + 1$ CL
S ensembles of non-perturbatively $\\mathcal{O}(a)$ improved Wilson fermio
ns with tree-level Symanzik improved gauge action. For the computation of
the required three-point-functions we used a stochastic technique which en
abled us to compute various combinations of currents and interpolators sim
ultaneously.\n\nhttps://indico.cern.ch/event/764552/contributions/3420527/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420527/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gluonic Structure of Mesons
DTSTART;VALUE=DATE-TIME:20190618T110500Z
DTEND;VALUE=DATE-TIME:20190618T112500Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420531@indico.cern.ch
DESCRIPTION:Speakers: Dimitra Pefkou (MIT)\nQuantifying the structure of m
esons in terms of their fundamental constituents is a major goal of hadron
research. In the last decades extensive progress has been made in the cal
culation of quark structure\, however very little is understood about the
gluonic equivalent. One way of quantifying how quarks and gluons make up m
esons is via the generalized parton distribution functions (GPDs). This po
ster presents recent results on the gluon moments of GPDs for different me
sons\, calculated on lattices of 0.12 fm spacing.\n\nhttps://indico.cern.c
h/event/764552/contributions/3420531/
LOCATION: Foyer
URL:https://indico.cern.ch/event/764552/contributions/3420531/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Taming statistical and systematic uncertainties in the hadronic va
cuum polarization contribution of light quarks to the muon $(g-2)$
DTSTART;VALUE=DATE-TIME:20190617T074000Z
DTEND;VALUE=DATE-TIME:20190617T080000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420542@indico.cern.ch
DESCRIPTION:Speakers: Laurent Lellouch (CNRS & Aix-Marseille U.)\nTo deliv
er a precise determination of the hadronic vacuum polarization contributio
n of light quarks to the muon $(g-2)$\, lattice calculations must overcome
a number of challenges. These include a signal-to-noise problem\, finite-
volume effects and\, when staggered fermions are used\, significant taste-
breaking effects. I will present some of the solutions which the BMW colla
boration has been investigating to mitigate these problems.\n\nhttps://ind
ico.cern.ch/event/764552/contributions/3420542/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420542/
END:VEVENT
BEGIN:VEVENT
SUMMARY:An exploratory study of heavy-light semileptonics using distillati
on
DTSTART;VALUE=DATE-TIME:20190617T074000Z
DTEND;VALUE=DATE-TIME:20190617T080000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3421229@indico.cern.ch
DESCRIPTION:Speakers: Felix Erben (University of Edinburgh)\nWe present ou
r exploratory study with the aim of simulating heavy-light semileptonics a
s part of the RBC-UKQCD charm (to bottom) physics programme. We are using
a distillation-based setup as a strategy to get optimised plateaus in semi
-leptonic $D_{(s)}$ and $B_{(s)}$ decays. The study will be done in a cent
re-of-mass frame and several moving frames and will use an $N_f=2+1$ domai
n wall fermion lattice with a pion mass of $340$ $\\mathrm{MeV}$\, with th
e aim of extending the study to a physical-point domain-wall ensemble.\n\n
https://indico.cern.ch/event/764552/contributions/3421229/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3421229/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon scalar charge with overlap fermions
DTSTART;VALUE=DATE-TIME:20190620T085000Z
DTEND;VALUE=DATE-TIME:20190620T091000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420550@indico.cern.ch
DESCRIPTION:Speakers: Liuming Liu (Institute of Modern Physics\, Chinese A
cademy of Sciences)\nIn this talk I present the result on nucleon isovecto
r scalar charge using overlap fermions on 2+1 flavor domain-wall configura
tions generated by RBC/UKQCD collaboration. The ensembles span four lattic
e spacings 0.06\, 0.08\, 0.11 and 0.14 fm and five pion masses in the rang
e from the physical value to 370 MeV. The scalar charge is extracted from
the ratio of 3pt and 2pt functions by two-state fit. Extrapolation to the
physical pion mass\, continuum limit and infinite volume is performed by s
imultaneously fit in the three variables. Our result is in agreement with
previous lattice determinations.\n\nhttps://indico.cern.ch/event/764552/co
ntributions/3420550/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420550/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quark masses and decay constants in Nf=2+1+1 isoQCD with Wilson cl
over twisted mass fermions
DTSTART;VALUE=DATE-TIME:20190617T070000Z
DTEND;VALUE=DATE-TIME:20190617T072000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428253@indico.cern.ch
DESCRIPTION:Speakers: Garofalo Marco (INFN section of Tor Vergata)\nIn thi
s contribution we present a preliminary data analysis of the pion\, kaon a
nd D-meson masses and decay constants\, as well as preliminary results for
light\, strange and charm renormalized masses. The analysis is based on t
he gauge ensembles produced by ETMC with Nf=2+1+1 flavours of Wilson clove
r twisted mass quarks\, which cover a range of lattice spacings from ~0.10
to 0.07 fm and include configurations at the physical pion point on latti
ces with linear size up to L ~ 5.6 fm.\n\nhttps://indico.cern.ch/event/764
552/contributions/3428253/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3428253/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Strange nucleon form factors and isoscalar charges with $N_f=2+1$
$\\mathcal{O}(a)$-improved Wilson fermions
DTSTART;VALUE=DATE-TIME:20190621T070000Z
DTEND;VALUE=DATE-TIME:20190621T072000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420553@indico.cern.ch
DESCRIPTION:Speakers: Jonas Wilhelm (Universität Mainz)\nWe report on our
calculation of the strange contribution to the vector and axial vector fo
rm factors. The strange charge radii\, magnetic moment\, and axial charge
are extracted by model independent $z$-expansion fits to the $Q^2$-depende
nce of the respective form factors. Furthermore\, the isoscalar contributi
on to the axial and tensor charge is investigated by combining the calcula
tion of connected and disconnected diagrams. The required renormalization
is performed with the Rome-Southampton method. We make use of the CLS $N_f
=2+1$ $\\mathcal{O}(a)$-improved Wilson fermion ensembles. Results are rep
orted for pion masses in the range $m_\\pi=200-360\\\,\\text{MeV}$ and lat
tice spacings $a=0.05-0.086\\\,\\text{fm}$.\n\nhttps://indico.cern.ch/even
t/764552/contributions/3420553/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420553/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$K_{l3}$ form factors in $N_f = 2+1$ QCD at physical point on larg
e volume
DTSTART;VALUE=DATE-TIME:20190618T085000Z
DTEND;VALUE=DATE-TIME:20190618T091000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3421232@indico.cern.ch
DESCRIPTION:Speakers: Junpei Kakazu (Univ. of Tsukuba)\nWe present our res
ults of the $K_{l3}$ form factors on the volume of configuration more than
$L=$10 fm\, with the physical pion and kaon masses using the stout-smeari
ng clover $N_f = 2+1$ quark action and Iwasaki gauge action at $a^{-1}=2.3
33$ GeV.\n\nThe $K_{l3}$ form factor at zero momentum transfer is obtained
from fit results using the NLO formula in SU(3) chiral perturbation theor
y with NNLO analytic terms. In addition\, we estimate systematic errors of
the form factor\, such as ones coming from excited state contamination an
d finite size effect.\n\nWe also determine the value of $|V_{us}|$ by comb
ining our result with the experimental $K_{l3}$ form factor and check the
consistency with the standard model prediction. The result is compared wit
h the previous lattice calculations.\n\nhttps://indico.cern.ch/event/76455
2/contributions/3421232/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3421232/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-perturbative renormalization in QCD+QED and its applications t
o weak decays
DTSTART;VALUE=DATE-TIME:20190618T093000Z
DTEND;VALUE=DATE-TIME:20190618T095000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420567@indico.cern.ch
DESCRIPTION:Speakers: Matteo Di Carlo (Sapienza Università di Roma and IN
FN)\nWe present a new strategy to extend the usual non-perturbative renorm
alization procedure\, performed on the lattice in the RI'-MOM scheme\, in
order to include electromagnetic corrections at first order in perturbatio
n theory. We show the first numerical estimates for the QED corrections to
the renormalization constants of quark bilinears and four-fermion operato
rs (two quarks and two leptons). Since the non-perturbative renormalizatio
n is an important step in the numerical calculation of hadronic decay rate
s\, we discuss the application of this strategy to light-meson leptonic de
cays. The numerical results are obtained using gauge ensembles produced by
the European Twisted Mass Collaboration with $N_f=4$ dynamical quarks.\n\
nhttps://indico.cern.ch/event/764552/contributions/3420567/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3420567/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Matrix elements of bound states in a finite volume
DTSTART;VALUE=DATE-TIME:20190621T072000Z
DTEND;VALUE=DATE-TIME:20190621T074000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420526@indico.cern.ch
DESCRIPTION:Speakers: Andrew Jackura (Indiana University)\nRecently\, a fr
amework was developed for studying form factors of two-body states probed
with an external current. Finite volume matrix elements that may be comput
ed via lattice QCD are converted to infinite volume generalized form facto
rs. These generalized form factors allow us to study the structure of comp
osite states. In this talk\, we consider the application of this formalism
to bound states\, and compare the leading finite volume effects to the ge
neral results of the framework. Specifically\, we pay close attention to t
he implication of this formalism for the extraction of the form factors of
the deuteron.\n\nhttps://indico.cern.ch/event/764552/contributions/342052
6/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420526/
END:VEVENT
BEGIN:VEVENT
SUMMARY:New approaches to semileptonic decays
DTSTART;VALUE=DATE-TIME:20190617T062000Z
DTEND;VALUE=DATE-TIME:20190617T064000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3421233@indico.cern.ch
DESCRIPTION:Speakers: Guido Martinelli (Sapienza Universita e INFN\, Roma
I (IT))\nWe present a proposal to compute on the lattice $B \\to \\pi$ for
m factors in the full momentum range. We also discuss some new results for
the $B \\to D\,D^*$ semileptonic form factors.\n\nhttps://indico.cern.ch/
event/764552/contributions/3421233/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3421233/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-perturbative renormalization by decoupling
DTSTART;VALUE=DATE-TIME:20190617T072000Z
DTEND;VALUE=DATE-TIME:20190617T074000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420569@indico.cern.ch
DESCRIPTION:Speakers: Alberto Ramos Martinez (Trinity College Dublin (IE))
\nWe show that the strong coupling can be accurately determined with the h
elp of the running coupling in the pure gauge theory. We use a low energy
scale computed in the three-flavor theory with heavy quarks\, together wit
h the non-perturbative running in pure gauge from 800 MeV to the electrowe
ak scale to determine the three-flavor Lambda parameter accurately and in
agreement with current knowledge. The method is quite general and can be a
pplied to solve other renormalization problems (like the determination of
quark masses)\, using finite or infinite volume intermediate renormalizati
on schemes.\n\nhttps://indico.cern.ch/event/764552/contributions/3420569/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3420569/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QED effects on the decay of charged pions and kaons
DTSTART;VALUE=DATE-TIME:20190618T095000Z
DTEND;VALUE=DATE-TIME:20190618T101000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3421234@indico.cern.ch
DESCRIPTION:Speakers: Paul Rakow (University of Liverpool)\nThe major deca
y rates of the charged pion and kaon mesons are to the end state of a muon
and neutrino. This mode contributes over 99.9 percent to the pion decay\,
and about 64 percent to the kaon decay.\n\n Analysing this decay on the
lattice could lead to improved values for the meson decay constants and t
he parameters in the CKM matrix. High accuracy predictions will need to ha
ve QED effects included. We present some initial simulations taking accoun
t of the QED corrections by including a partially quenched muon propagator
with its photon cloud.\n\nhttps://indico.cern.ch/event/764552/contributio
ns/3421234/
LOCATION: Foyer
URL:https://indico.cern.ch/event/764552/contributions/3421234/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Parton Distribution Functions from Euclidean-Space Correlation Fun
ctions in Ioffe Time
DTSTART;VALUE=DATE-TIME:20190619T020000Z
DTEND;VALUE=DATE-TIME:20190619T022000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420534@indico.cern.ch
DESCRIPTION:Speakers: David Richards (Jefferson Lab)\nThe hadronic matrix
elements of bi-local operators at short Euclidean\nseparations evaluated a
s a function of Ioffe time can be related to\nthe convolution of the unive
rsal parton distribution functions (PDFs) and a\nshort-distance kernel. I
n this talk\, we describe the method\,\nbeginning with the needed renormal
izations for the\ncase of quark and antiquark fields separated by a Wilson
line\, and for\nthe case of two gauge-invariant currents. We then procee
d to discuss\nthe techniques developed to address the ``inverse problem''
needed to\nobtain the PDFs from the hadronic matrix elements calculated on
the\nlattice. Finally\, we present our programme of calculations for the
\npion and for the nucleon\, and possible extensions to explore the\nthree
-dimensional structure of hadrons.\n\nhttps://indico.cern.ch/event/764552/
contributions/3420534/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420534/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Properties of the $\\eta$ and $\\eta^\\prime$ mesons
DTSTART;VALUE=DATE-TIME:20190621T081000Z
DTEND;VALUE=DATE-TIME:20190621T083000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420471@indico.cern.ch
DESCRIPTION:Speakers: Jakob Simeth (University of Regensburg)\nWe present
results for $\\eta$ and $\\eta^\\prime$ masses and their four independent
decay constants\, determined directly from the axialvector channels.\nWe p
erform our analysis on the CLS 2+1 flavour ensembles\, from pion masses of
420 MeV down to the physical mass point. Four lattice spacings and two di
stinct mass trajectories allow to take the continuum limit and chiral inte
rpolation with care\, providing first results for some of the from phenome
nology lesser known low energy constants that appear in NLO large-$N_c$ Ch
PT.\nAs a by-product\, we test the flavour-singlet PCAC relation\, probing
the purely gluonic contribution to the singlet decay constants.\n\nhttps:
//indico.cern.ch/event/764552/contributions/3420471/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3420471/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon axial and electromagnetic form factors from 2+1+1-flavor Q
CD
DTSTART;VALUE=DATE-TIME:20190621T064000Z
DTEND;VALUE=DATE-TIME:20190621T070000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420558@indico.cern.ch
DESCRIPTION:Speakers: Yong-Chull Jang (Brookhaven National Laboratory)\nRe
sults for the nucleon isovector form factors for the vector and axial-vect
or currents will be presented. The calculations are done using clover vale
nce quarks on 11 ensembles\, including two physical pion mass ensembles\,
generated with 2+1+1 flavors of HISQ fermions by the MILC collaboration. H
igh statistics are achieved using the truncated solver method with bias co
rrection\, and the coherent sequential source method. \nExtrapolation to t
he physical limit includes leading order discretization\, chiral and finit
e volume effects. In addition\, we will present z-expansion analysis with
unitarity and sum rule constraints.\n\nhttps://indico.cern.ch/event/764552
/contributions/3420558/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420558/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Zero modes of the domain wall operator for 2+1 flavor lattices wit
h $a^{-1} \\approx 1$ GeV
DTSTART;VALUE=DATE-TIME:20190621T083000Z
DTEND;VALUE=DATE-TIME:20190621T085000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420472@indico.cern.ch
DESCRIPTION:Speakers: Duo Guo (Columbia University)\nWe explore the topolo
gical properties of lattices without cooling through measurements of the z
ero modes of the domain wall operator. We investigate the eigenvalue spect
rum and the space-time properties of the zero modes. We study the relation
ship between the zero modes and the $\\eta’$ mass.\n\nhttps://indico.cer
n.ch/event/764552/contributions/3420472/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3420472/
END:VEVENT
BEGIN:VEVENT
SUMMARY:I=3/2 nucleon-pion scattering and the Delta(1232) resonance on 2+1
flavor CLS ensembles using the stochastic LapH method
DTSTART;VALUE=DATE-TIME:20190617T083000Z
DTEND;VALUE=DATE-TIME:20190617T085000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420493@indico.cern.ch
DESCRIPTION:Speakers: Christian Walther Andersen (University of Southern D
enmark)\nPreliminary results are presented for nucleon-pion scattering amp
litudes in the $I=3/2$ channel. The calculations are performed on a set of
$N_\\text{f} = 2+1$ Wilson clover ensembles generated by the CLS initiati
ve with pion masses down to $m_\\pi = 200\\text{MeV}$ where the $\\Delta(1
232)$ state is unstable. The required hadron correlation functions are eff
iciently evaluated using the stochastic LapH method. Compared to meson-mes
on scattering\, the temporal correlation matrices employed here require co
nsiderably more Wick contractions\, each of which is computed by contracti
ng hadron tensors of rank two and three. Our approach to these additional
difficulties\, which employs highly optimized BLAS libraries for correlati
on function construction\, is also discussed.\n\nhttps://indico.cern.ch/ev
ent/764552/contributions/3420493/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3420493/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Semileptonic decays $B_{(s)} \\to D_{(s)}^{(\\ast)} \\ell \\nu$ fo
rm factors using the OK action
DTSTART;VALUE=DATE-TIME:20190618T101000Z
DTEND;VALUE=DATE-TIME:20190618T103000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3421212@indico.cern.ch
DESCRIPTION:Speakers: Seungyeob Jwa (Seoul National University)\nWe presen
t recent progress in lattice calculations of semileptonic decays $B_{(s)}
\\to D_{(s)}\\ell\\nu$ form factors using the Oktay-Kronfeld (OK) action f
or the charm and bottom quarks. Data on four MILC HISQ ensembles: a12m310\
, a12m220\, a09m310\, a09m220 has been generated using the coherent sequen
tial source to increase the statistics cost effectively. The excited state
s are controlled with multi-state fits to the 4 (or 6) source-sink separat
ions. We will present the form factor for $B_{(s)} \\to D_{(s)}^\\ast\\el
l\\nu$ at zero recoil\, and the form factors for $B_{(s)} \\to D_{(s)}\\el
l\\nu$ at nonzero recoil. Current renormalization is underway using the no
nperturbative RI-(S)MOM method. Results for the spectrum\, decay constants
and details of tuning the quark masses will be presented in a companion p
roceeding.\n\nhttps://indico.cern.ch/event/764552/contributions/3421212/
LOCATION: Foyer
URL:https://indico.cern.ch/event/764552/contributions/3421212/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Resonance information from lattice energy levels using chiral EFT
DTSTART;VALUE=DATE-TIME:20190620T091000Z
DTEND;VALUE=DATE-TIME:20190620T093000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420473@indico.cern.ch
DESCRIPTION:Speakers: Zhi-Hui Guo (Hebei Normal University)\nI will discus
s my recent works on the determination of resonance properties from the la
ttice energy levels using the chiral effective field theory.\n\nhttps://in
dico.cern.ch/event/764552/contributions/3420473/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3420473/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hadronic Light-by-Light contribution to g-2 update
DTSTART;VALUE=DATE-TIME:20190618T083000Z
DTEND;VALUE=DATE-TIME:20190618T085000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420481@indico.cern.ch
DESCRIPTION:Speakers: Thomas Blum ()\nWe update our calculation of the had
ronic light-by-light contribution to the muon anomalous magnetic moment. O
ur results comprise computations done on five gauge field ensembles employ
ing 2+1 flavors of mobius domain wall fermions and Iwasaki and Iwasaki DSD
R gluons\, all with physical masses. Inverse lattice spacings range from 1
to 2.4 GeV\, and lattice sizes from 4.8 to 6.4 fm. We present preliminary
continuum and infinite volume limits for both finite and infinite volume
QED.\n\nhttps://indico.cern.ch/event/764552/contributions/3420481/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420481/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$\\beta$ dependence of the nuclear transition end points at finite
quark masses
DTSTART;VALUE=DATE-TIME:20190619T033000Z
DTEND;VALUE=DATE-TIME:20190619T035000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420408@indico.cern.ch
DESCRIPTION:Speakers: Jangho Kim (Goethe University Frankfurt am Main)\nLa
ttice QCD in a dual formulation with staggered fermions is well establishe
d in the strong coupling limit and allows to perform Monte Carlo simulatio
ns at finite baryon chemical potential.\nWe have recently addressed the de
pendence of the nuclear critical end point as a function of the quark mass
$m_q$ \, and separately as a function of the inverse gauge coupling $\\be
ta$ in the chiral limit.\nHere we proceed to determine the dependence of t
he nuclear transition of both $m_q$ and $\\beta$ on isotropic lattices and
attempt to pinpoint the critical end point for various $\\beta$ where the
sign problem is still manageable.\n\nhttps://indico.cern.ch/event/764552/
contributions/3420408/
LOCATION: Shimao 1A+1B
URL:https://indico.cern.ch/event/764552/contributions/3420408/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Electromagnetic corrections to leptonic decays
DTSTART;VALUE=DATE-TIME:20190619T041000Z
DTEND;VALUE=DATE-TIME:20190619T043000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3421214@indico.cern.ch
DESCRIPTION:Speakers: Antonin Portelli (The University of Edinburgh)\nIn t
his talk we present the status of the RBC-UKQCD collaboration project to c
ompute the QED corrections to light pseudo-scalar leptonic decay rates. Th
is computation is using domain-wall fermions at close-to-physical quark ma
sses. We summarise the overall strategy to obtain the relevant amplitude c
orrections from Euclidean correlation functions. These correlations functi
ons are assembled using an all-to-all strategy including low-mode averagin
g using 2000 eigenvectors of the fermion matrix. We present preliminary re
sults implementing this strategy.\n\nhttps://indico.cern.ch/event/764552/c
ontributions/3421214/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3421214/
END:VEVENT
BEGIN:VEVENT
SUMMARY:High temperature expansion method for QCD effective theories
DTSTART;VALUE=DATE-TIME:20190621T091000Z
DTEND;VALUE=DATE-TIME:20190621T093000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420409@indico.cern.ch
DESCRIPTION:Speakers: Quang Pham (Goethe University Frankfurt)\nThe high t
emperature expansion (HTE) had been widely used as a standard tool to stud
y phase transitions in statistical mechanics. This method applied to QCD e
ffective theories provides new insights to study quark matter at finite ch
emical potential. In this talk\, the general idea of HTE for the Ising mod
el is briefly reviewed and its applications to effective theories of QCD a
re described. We will present some promising results obtained from this a
pproach. A method called Partial Differential Approximants\, which is used
to analyze series of several couplings\, will be discussed. We will also
indicate a couple of open problems.\n\nhttps://indico.cern.ch/event/76455
2/contributions/3420409/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420409/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Development of Hamiltonian Finite Volume Method of Two Body Sy
stem within Partial Wave Mixing in Rest System
DTSTART;VALUE=DATE-TIME:20190618T085000Z
DTEND;VALUE=DATE-TIME:20190618T091000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420475@indico.cern.ch
DESCRIPTION:Speakers: Yan Li (University of Chinese Academy of Sciences)\n
Hamiltonian effective field theory has been used for explaining Lattice da
ta. We develop it within partial waves mixing in the rest frame. The dimen
sion of the Hamiltonian can be highly reduced with the partial wave cut-of
f and rotation symmetry. We apply this method to extract the Pion-Pion s-\
, d- and f-wave phase shifts within Isospin=2 case.\n\nhttps://indico.cern
.ch/event/764552/contributions/3420475/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3420475/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Meson interactions at Large Nc from Lattice QCD
DTSTART;VALUE=DATE-TIME:20190618T062000Z
DTEND;VALUE=DATE-TIME:20190618T064000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420476@indico.cern.ch
DESCRIPTION:Speakers: Fernando Romero-López ()\nThe Large $N_c$ limit is
often invoked in phenomenological approaches. Even though it is a useful s
implification of QCD\, the systematic uncertainties of these large-$N_c$-i
nspired approximations to QCD remain unclear. Moreover\, it fails in some
observables\, such as the ratio of isospin amplitudes in the $K \\to \\pi
\\pi$ weak decays. In this context\, lattice QCD has a lot of yet unexplor
ed potential to shed light on the Nc scaling of these observables. I will
review in this talk some of our recent results concerning weak decays\, sc
attering parameters and meson decay constants at Large $N_c$ from lattice
simulations.\n\nhttps://indico.cern.ch/event/764552/contributions/3420476/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3420476/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Recent progress on (implementing) the relativistic three-particle
quantization condition
DTSTART;VALUE=DATE-TIME:20190618T105000Z
DTEND;VALUE=DATE-TIME:20190618T111000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420477@indico.cern.ch
DESCRIPTION:Speakers: Fernando Romero-López ()\nWe describe progress duri
ng the last year on extending the range of applicability of the model-inde
pendent three-particle quantization condition and in implementing it in pr
actice. Results include the extension of the formalism to allow subchannel
resonances\, which has been achieve in two different ways\, and the inclu
sion of d-wave two- and three-particle interactions in practical implement
ation. We demonstrate in model examples how the quantization could be used
in practice. We also emphasize that it can be used to study infinite-volu
me physics\, one example being the possible binding of an Efimov-like trim
er by d-wave interactions.\n\nhttps://indico.cern.ch/event/764552/contribu
tions/3420477/
LOCATION: Foyer
URL:https://indico.cern.ch/event/764552/contributions/3420477/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The general formalism of momentum transformation in the moving fin
ite volume
DTSTART;VALUE=DATE-TIME:20190618T091000Z
DTEND;VALUE=DATE-TIME:20190618T093000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420478@indico.cern.ch
DESCRIPTION:Speakers: Jiajun Wu (University of Chinese Academy of Sciences
)\nIn the two body system\, the S matrix in the infinite volume is defined
in the rest system\, while to obtain more spectra in finite volume\, peop
le extract the energy spectrum of finite volume in the moving system. As a
result\, it needs momentum transformation to connect the energy spectrum
in the moving finite volume and the S matrix in the infinite volume. In th
is work\, we find a general formalism of such momentum transformation. In
this formalism it has two changeable parameters\, then we develop three di
fferent transformation equations. The two of them are used in the previous
work\, and the third one is a new form which will be helpful to develop t
he Hamiltonian approach in the moving two body system.\n\nhttps://indico.c
ern.ch/event/764552/contributions/3420478/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3420478/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theoretical and practical progresses in the HAL QCD mehod
DTSTART;VALUE=DATE-TIME:20190619T031000Z
DTEND;VALUE=DATE-TIME:20190619T033000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420482@indico.cern.ch
DESCRIPTION:Speakers: Sinya Aoki (Kyoto University)\nWe report recent theo
retical and practical progresses in the HAL QCD potential method\, which a
re summarizewd as follows.\n(1) The explicit definition of the potential i
n terms of the derivative expansion.\n(2) The construction of Hermite pote
ntials from non-Hermite potentials.\n(3) HAL QCD potentials from NBA wave
fucntions in the moving systems.\n(4) The partial wave decompositions on t
he finite box with the periodic boundary condition in the HAL QCD method.\
n\nhttps://indico.cern.ch/event/764552/contributions/3420482/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3420482/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Radiative Corrections to Semileptonic Decay Rates
DTSTART;VALUE=DATE-TIME:20190619T033000Z
DTEND;VALUE=DATE-TIME:20190619T035000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3421228@indico.cern.ch
DESCRIPTION:Speakers: Christopher Sachrajda (University of Southampton)\nD
uring the last few years we have developed the theoretical framework for i
ncluding radiative corrections to lattice computations of the $\\pi_{\\ell
2}$ and $K_{\\ell 2}$ leptonic decay rates and performed the correspondin
g numerical calculations. This necessarily includes the treatment of infra
red divergences. In this talk we discuss the extension of this framework t
o semileptonic decays\, such as $K_{\\ell 3}$ decays. We show that the $1/
L$ finite-volume corrections in the QED_L formulation of lattice QED are u
niversal but depend on the derivatives of the QCD form-factors with respec
t to the square of the momentum transfer $q^2$. We also discuss the conseq
uences of the presence of intermediate states which have energies which ar
e smaller than those of the external states.\n\nhttps://indico.cern.ch/eve
nt/764552/contributions/3421228/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3421228/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Schwinger-Keldysh formalism for Lattice Gauge Theories
DTSTART;VALUE=DATE-TIME:20190621T060000Z
DTEND;VALUE=DATE-TIME:20190621T062000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420432@indico.cern.ch
DESCRIPTION:Speakers: Hiroki Hoshina ()\nIt is important to compute transp
ort coefficients in QCD at finite temperature and density. When the imagin
ary-time formalism of Lattice QCD is used\, the spectral functions have to
be reconstructed by supplementing certain Ansatze for correlation functio
ns on the lattice. On the other hand\, real-time Green’s functions can b
e obtained directly in the Schwinger-Keldysh (SK) formalism. But the SK fo
rmalism has not been constructed so far for QCD non-perturbatively.\nIn th
is work we formulate the SK formalism for Lattice QCD by constructing the
transfer matrix in the direction of real time for gauge link field and Wil
son fermion. We examine the spectral functions and other real-time Green
’s functions in weak gauge-coupling limit. We also obtain the Kubo formu
lae in this framework as a summation of the real-time Green’s functions
on the closed time path.\n\nhttps://indico.cern.ch/event/764552/contributi
ons/3420432/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420432/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A strategy for the calculation of disconnected contributions to QE
D and strong isospin-breaking effects.
DTSTART;VALUE=DATE-TIME:20190619T035000Z
DTEND;VALUE=DATE-TIME:20190619T041000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3421231@indico.cern.ch
DESCRIPTION:Speakers: James Richings (University of Southampton)\nWhen cal
culating isospin-breaking corrections to hadronic quantities\, sea quark e
ffects are often neglected. In this work by the RBC/UKQCD collaboration\,
based on their domain-wall fermion ensembles combined with an all-to-all a
pproach\, we discuss our strategy for computing the disconnected isospin-b
reaking contributions to light pseudo-scalar meson masses and matrix eleme
nts. We will present our strategy for the calculation of disconnected quan
tities and discuss results for isospin-breaking corrections to light pseud
o scalar meson masses using an all-to-all approach and low-mode averaging.
\n\nhttps://indico.cern.ch/event/764552/contributions/3421231/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3421231/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Muon g-2 experiment at Fermilab and the First Physics Run
DTSTART;VALUE=DATE-TIME:20190621T014500Z
DTEND;VALUE=DATE-TIME:20190621T021500Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428301@indico.cern.ch
DESCRIPTION:Speakers: Dikai Li ()\nMeasurement of the muon anomalous magne
tic moment (muon g-2) is a sensitive tool for testing the Standard Model (
SM) and searching for new physics. It is an important and complementary t
ool to probe the high energy frontier. In this talk\, I will provide an ov
erview on the Fermilab Muon g-2 experiment\, which aims to perform the mea
surement the muon g-2 with a precision goal of 140 parts per billion\, a f
ourfold improvement over the previous BNL measurement. The first physics r
un finished in 2018 collecting a data sample with similar size of the BNL
measurement. The current experimental status and prospects of the experime
nt will also be discussed\n\nhttps://indico.cern.ch/event/764552/contribut
ions/3428301/
LOCATION: Wuchang + Hankou
URL:https://indico.cern.ch/event/764552/contributions/3428301/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Euclidean correlation functions for transport coefficients under g
radient flow
DTSTART;VALUE=DATE-TIME:20190619T033000Z
DTEND;VALUE=DATE-TIME:20190619T035000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420437@indico.cern.ch
DESCRIPTION:Speakers: Hai-Tao Shu (Bielefeld University)\nIn this talk we
report the progress of our studies on the temporal correlation functions u
nder gradient flow from lattice QCD. The operators to construct the correl
ation functions under consideration include the energy-momentum tensor and
color-electric field. These calculations are the first step in our long-t
erm project of estimating some important quantities: shear&bulk viscositie
s and heavy quark momentum diffusion coefficient as they could be obtained
from the spectral functions extracted from the corresponding correlation
functions. In our calculations the gradient flow technique is applied to i
mprove the signal in measuring the correlation functions. We will study th
e effect of the gradient flow on the small distance part of the correlator
s in comparison to perturbative estimates and the improvement of the signa
l at large distances.\n\nhttps://indico.cern.ch/event/764552/contributions
/3420437/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420437/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The chiral phase transition temperature in (2+1)-flavor QCD
DTSTART;VALUE=DATE-TIME:20190617T062000Z
DTEND;VALUE=DATE-TIME:20190617T064000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420425@indico.cern.ch
DESCRIPTION:Speakers: Christian Schmidt (University of Bielefeld)\nWe pres
ent a lattice QCD calculation with (2+1)-flavor of highly improved stagger
ed quarks (HISQ). The light quark masses are chosen predominantly lighter
than physical\, i.e. they correspond to a Goldstone pion mass in the range
of 58 MeV \n\nhttps://indico.cern.ch/event/764552/contributions/3420425/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420425/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QCD Topology to High Temperatures via Improved Reweighting
DTSTART;VALUE=DATE-TIME:20190617T085000Z
DTEND;VALUE=DATE-TIME:20190617T091000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420411@indico.cern.ch
DESCRIPTION:Speakers: P. Thomas Jahn (TU Darmstadt)\nAt high temperatures\
, the topological susceptibility of QCD becomes relevant for the propertie
s of axion dark matter. However\, the strong suppression of non-zero topol
ogical sectors causes ordinary sampling techniques to fail\, since fluctua
tions of the topological charge can only be measured reliably if enough tu
nneling events between sectors occur. We present an improvement of a techn
ique the we recently developed to circumvent this problem based on a combi
nation of gradient flow and reweighting techniques and quote first results
of the topological susceptibility in pure SU(3) Yang-Mills theory up to $
7~T_\\mathrm c$.\n\nhttps://indico.cern.ch/event/764552/contributions/3420
411/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420411/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Large $N_c$ behaviour of an effective lattice theory for heavy den
se QCD
DTSTART;VALUE=DATE-TIME:20190619T041000Z
DTEND;VALUE=DATE-TIME:20190619T043000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420438@indico.cern.ch
DESCRIPTION:Speakers: Jonas Benedict Scheunert ()\nCombining strong coupli
ng and hopping expansion one can derive a dimensionally reduced effective
theory of lattice QCD.\nThis theory has a reduced sign problem\, is amenab
le to analytic evaluation and was successfully used to study the cold and
dense regime of QCD for sufficiently heavy quarks.\nWe show the derivation
and evaluation of the effective theory for arbitrary $N_c$ up to $\\kappa
^4$.\nThe inclusion of gauge corrections is also investigated.\nWe find th
at before the onset\, the baryon number density is exponentially suppresse
d for growing $N_c$ even for $T \\neq 0$. This suggests that in the large
$N_c$ limit the onset transition is first order up to the deconfinement tr
ansition.\nAfter the onset\, the pressure is shown to scale as $p \\sim N_
c$ at all available orders. Possible implications on quarkyonic matter are
discussed.\n\nhttps://indico.cern.ch/event/764552/contributions/3420438/
LOCATION: Shimao 1A+1B
URL:https://indico.cern.ch/event/764552/contributions/3420438/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Continuous Time Simulations of Strong Coupling LQCD at Finite Bary
on Density
DTSTART;VALUE=DATE-TIME:20190619T012000Z
DTEND;VALUE=DATE-TIME:20190619T014000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420426@indico.cern.ch
DESCRIPTION:Speakers: Marc Klegrewe (Bielefeld University)\nWe study latti
ce QCD in the limit of infinite gauge coupling on a discrete spatial yet c
ontinuous Euclidean time lattice at finite baryon chemical potential $\\mu
_B$. The continuous time framework is based on sending $N_\\tau\\rightarro
w \\infty$ and the bare anisotropy to infinity while fixing the temperatur
e in a non-perturbative setup. This leads to a sign problem free algorithm
that allows us to study the whole $\\mu_B$-$T$ plane. We measure the pres
sure and energy density at finite temperature and baryon density in the ch
iral limit. We compare with Taylor coefficients from the measurement of ba
ryon fluctuations. Calculations are based on our worm type Monte Carlo alg
orithm featuring a polymer resummation scheme that improves accuracy.\n\nh
ttps://indico.cern.ch/event/764552/contributions/3420426/
LOCATION: Shimao 1A+1B
URL:https://indico.cern.ch/event/764552/contributions/3420426/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thermal Quarkonium Mass Shift from Euclidean Correlators
DTSTART;VALUE=DATE-TIME:20190618T103000Z
DTEND;VALUE=DATE-TIME:20190618T105000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420412@indico.cern.ch
DESCRIPTION:Speakers: Alexander Maximilian Eller (TU Darmstadt)\nBrambilla
et al. have derived an effective description of quarkonium with two param
eters: a momentum diffusion term which has been widely explored within th
e community\, and a real self-energy term. We derive a relation between t
he self-energy term and Euclidean electric field correlators along a Polya
kov line\, which can directly be studied on the lattice without the need f
or analytical continuation. We also discuss the problems in determining t
he correlator within the scope of the quenched QCD approximation.\n\nhttps
://indico.cern.ch/event/764552/contributions/3420412/
LOCATION: Foyer
URL:https://indico.cern.ch/event/764552/contributions/3420412/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice investigation of the phase diagram of the 1+1 dimensional
Gross-Neveu model at finite number of fermion flavors
DTSTART;VALUE=DATE-TIME:20190619T031000Z
DTEND;VALUE=DATE-TIME:20190619T033000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420407@indico.cern.ch
DESCRIPTION:Speakers: Laurin Pannullo (Goethe University Frankfurt)\nWe ex
plore the phase diagram of the 1+1 dimensional Gross-Neveu model at finite
number of fermion flavors using lattice field theory. Besides a chirally
symmetric phase and a homogeneously broken phase we find clear evidence fo
r the existence of an inhomogeneous phase\, where the chiral condensate is
a spatially oscillating function. We present numerical results for the ph
ase diagram and visualize the shape of the expectation value of the chiral
condensate in the inhomogeneous phase.\n\nhttps://indico.cern.ch/event/76
4552/contributions/3420407/
LOCATION: Shimao 1A+1B
URL:https://indico.cern.ch/event/764552/contributions/3420407/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Conductivity of quark-gluon matter in the external magnetic field
DTSTART;VALUE=DATE-TIME:20190620T072000Z
DTEND;VALUE=DATE-TIME:20190620T074000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420403@indico.cern.ch
DESCRIPTION:Speakers: Nikita Astrakhantsev ()\nWe study the conductivity o
f quark-gluon matter in the presence of external magnetic field $B$ within
LQCD with dynamical staggered $2 + 1$ quarks at physical pion $m_{\\pi}$
and strange quark $m_s$ masses in the deconfinement phase $T = 200\\\,\\mb
ox{MeV}$. We first measure the current-current Euclidean correlator\, then
extract the conductivity via analytical continuation within the Backus-Gi
lbert method. We observe that $\\sigma_{\\parallel}$ rapidly grows in the
direction of magnetic field and that $\\sigma_{\\perp}$ on contrary decrea
ses. This observation is in agreement with the Chiral Magnetic Effect (CME
) predictions.\n\nhttps://indico.cern.ch/event/764552/contributions/342040
3/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420403/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Phase diagram of QCD in $(B\,T\,\\mu)$ space from analytical conti
nuation
DTSTART;VALUE=DATE-TIME:20190620T081000Z
DTEND;VALUE=DATE-TIME:20190620T083000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420402@indico.cern.ch
DESCRIPTION:Speakers: Andrey Kotov ()\nWe study the phase diagram of QCD a
t nonzero temperature\, chemical potential and magnetic field. Simulations
are performed with $N_f=2+1$ stout improved staggered quarks (with physic
al masses) and nonzero imaginary chemical potential. Results for real $\\m
u$ values are obtained by means of analytical continuation. By studying th
e renormalized chiral condensate and its dependence on the parameters of t
he system we measure the position and the width of the chiral phase transi
tion. We determine the curvature of chiral pseudo-critical line (in the $T
-\\mu$ plane) of QCD and its dependence on the magnitude of the magnetic f
ield.\n\nhttps://indico.cern.ch/event/764552/contributions/3420402/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420402/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The energy-momentum tensor in lattice QCD and the Equation of Stat
e
DTSTART;VALUE=DATE-TIME:20190621T070000Z
DTEND;VALUE=DATE-TIME:20190621T072000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420404@indico.cern.ch
DESCRIPTION:Speakers: Michele Pepe (INFN - National Institute for Nuclear
Physics)\nWe present a new theoretical and practical strategy to renormali
ze non-perturbatively the energy-momentum tensor in lattice QCD based on t
he framework of shifted boundary conditions. As a preparatory step for the
fully non-perturbative calculation\, we apply the strategy at 1 loop in p
erturbation theory determining the renormalization constants both of the g
luonic and of the fermionic components. Using shifted boundary conditions\
, the entropy density of QCD is directly related to the expectation value
of the space-time components of the renormalized energy-momentum tensor. W
e then discuss first results of numerical simulations of QCD with 3 flavou
rs of Wilson quarks for temperatures between 2.5 GeV and 80 GeV.\n\nhttps:
//indico.cern.ch/event/764552/contributions/3420404/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420404/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Critical endpoint in the continuum limit and critical endline at $
N_t=6$ of the finite temperature phase transition of QCD with clover fermi
ons
DTSTART;VALUE=DATE-TIME:20190621T072000Z
DTEND;VALUE=DATE-TIME:20190621T074000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420406@indico.cern.ch
DESCRIPTION:Speakers: Yoshifumi Nakamura ()\nWe investigate the critical e
ndpoints of the finite temperature phase transition of QCD at zero chemica
l potential. We employ the renormalization-group improved Iwasaki gauge ac
tion and non-perturbatively O(a)-improved Wilson-clover fermion action. Th
e critical endpoints are determined by using the intersection point of kur
tosis\, employing the multi-parameter\, multi-ensemble reweighting method.
We present results for the critical endline at $N_t$ = 6 and the continuu
m extrapolation for the critical endpoint of the SU(3)-flavor symmetric po
int including newly generated data at $N_t=12$.\n\nhttps://indico.cern.ch/
event/764552/contributions/3420406/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420406/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice computation of the quark propagator in Landau gauge at fin
ite temperature
DTSTART;VALUE=DATE-TIME:20190621T083000Z
DTEND;VALUE=DATE-TIME:20190621T085000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420405@indico.cern.ch
DESCRIPTION:Speakers: Paulo Silva (Center for Physics\, University of Coim
bra)\nWe report on the computation of the quark propagator at finite tempe
rature in the Landau gauge using quenched gauge configurations. The propag
ator form factors are computed for various temperatures\, above and below
the gluon deconfinement temperature $T_c$\, and for all the Matsubara freq
uencies. Our results suggest a strong connection between quark and gluon d
econfinement and favour chiral symmetry restoration above $T_c$.\n\nhttps:
//indico.cern.ch/event/764552/contributions/3420405/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420405/
END:VEVENT
BEGIN:VEVENT
SUMMARY:News from bottomonium spectral functions in thermal QCD
DTSTART;VALUE=DATE-TIME:20190619T022000Z
DTEND;VALUE=DATE-TIME:20190619T024000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420414@indico.cern.ch
DESCRIPTION:Speakers: Samuel Offler (Swansea University)\nWe present new r
esults on bottomonium at nonzero temperature\, using the FASTSUM Generatio
n 2L ensembles. Preliminary results for spectral function reconstruction u
sing the Maximal Entropy Method and Machine Learning are presented.\n\nhtt
ps://indico.cern.ch/event/764552/contributions/3420414/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420414/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Study of 2+1 flavor finite-temperature QCD using improved Wilson q
uarks at the physical point with the gradient flow
DTSTART;VALUE=DATE-TIME:20190621T081000Z
DTEND;VALUE=DATE-TIME:20190621T083000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420419@indico.cern.ch
DESCRIPTION:Speakers: Kazuyuki Kanaya (University of Tsukuba)\nWe study th
ermodynamic properties of 2+1 flavor QCD with improved Wilson quarks apply
ing the method of Makino and Suzuki based on the gradient flow. The method
provides us with a general way to compute correctly renormalized physical
observables irrespective of explicit violation of symmetries due to the r
egularization\, such as the violation of Poincare and chiral symmetries on
the lattice. We report on the status of our on-going project to compute t
he energy momentum tensor and the chiral condensate at the physical point.
\n\nhttps://indico.cern.ch/event/764552/contributions/3420419/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420419/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tempered Lefschetz thimble method and its application to the Hubba
rd model away from half-filling
DTSTART;VALUE=DATE-TIME:20190618T062000Z
DTEND;VALUE=DATE-TIME:20190618T064000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420420@indico.cern.ch
DESCRIPTION:Speakers: Masafumi Fukuma (Kyoto University)\nTempered Lefsche
tz thimble method (TLTM) [Fukuma and Umeda\, arXiv:1703.00861] is a (paral
lel-)tempering algorithm to solve the sign problem in Monte Carlo simulati
ons. It is implemented on the generalized Lefschetz thimble method (GLTM)
by using the flow time of the antiholomorphic gradient flow as the temperi
ng parameter. The TLTM is expected to versatilely solve the dilemma betwee
n the sign problem and the multimodal problem which inherently exists in t
he GLTM. In this talk\, after briefly reviewing the TLTM\, I apply the met
hod to the quantum Monte Carlo simulation of the Hubbard model away from h
alf-filling. I show that the TLTM certainly solves the dilemma and gives r
esults that agree nicely with exact values. This talk is based on a paper
in preparation [Fukuma\, Matsumoto and Umeda].\n\nhttps://indico.cern.ch/e
vent/764552/contributions/3420420/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420420/
END:VEVENT
BEGIN:VEVENT
SUMMARY:One-thimble regularisation of lattice field theories: is it only a
dream?
DTSTART;VALUE=DATE-TIME:20190618T064000Z
DTEND;VALUE=DATE-TIME:20190618T070000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420421@indico.cern.ch
DESCRIPTION:Speakers: Francesco Di Renzo (INFN - National Institute for Nu
clear Physics)\nLefschetz thimbles regularisation of (lattice) field theor
ies was put forward as a possible solution to the sign problem. Despite el
egant and conceptually simple\, it has many subtleties\, a major one boili
ng down to a plain question: how many thimbles should we take into account
? In the original formulation\, a single thimble dominance hypothesis was
put forward: in the thermodynamic limit\, universality arguments could sup
port a scenario in which the dominant thimble (associated to the global mi
nimum of the action) captures the physical content of the field theory. We
know by now many counterexamples and we have been pursuing multi-thimble
simulations ourselves. Still\, a single thimble regularisation would be th
e real breakthrough. We report on ongoing work aiming at a single thimble
formulation of lattice field theories.\n\nhttps://indico.cern.ch/event/764
552/contributions/3420421/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420421/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Heavy quark diffusion coefficient from lattice
DTSTART;VALUE=DATE-TIME:20190619T035000Z
DTEND;VALUE=DATE-TIME:20190619T041000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420422@indico.cern.ch
DESCRIPTION:Speakers: Viljami Leino (Technical University of Munich (TUM))
\nWe report progress towards measuring heavy momentum diffusion coefficien
t from a correlator of colour electric fields attached to a Polyakov loop
in pure SU(3) gauge theory. Using a multilevel algorithm and tree-level im
provement\, we study the behavior of the diffusion coefficient as a functi
on of temperature in a range 1.5\n\nhttps://indico.cern.ch/event/764552/co
ntributions/3420422/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420422/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gauge Corrections to Strong Coupling LQCD on Anisotropic Lattices
DTSTART;VALUE=DATE-TIME:20190619T014000Z
DTEND;VALUE=DATE-TIME:20190619T020000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420442@indico.cern.ch
DESCRIPTION:Speakers: Wolfgang Unger (Universität Bielefeld)\nLattice QCD
with staggered fermions can be formulated in dual variables to address th
e finite baryon density sign problem. In the past we have performed simula
tions in the strong coupling regime\, including leading order gauge correc
tions. In order to vary the temperature for fixed beta it was necessary to
introduce a bare anisotropy. In this talk we will extend our work to incl
ude results from a non-perturbative determination of the physical anisotro
py $a/a_t=\\xi(\\gamma\,\\beta)$\, which is necessary to unambiguously loc
ate the critical end point and the first order line of the chiral transiti
on.\n\nhttps://indico.cern.ch/event/764552/contributions/3420442/
LOCATION: Shimao 1A+1B
URL:https://indico.cern.ch/event/764552/contributions/3420442/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Canonical partition functions in lattice QCD at high temperature
DTSTART;VALUE=DATE-TIME:20190619T020000Z
DTEND;VALUE=DATE-TIME:20190619T022000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420441@indico.cern.ch
DESCRIPTION:Speakers: Atsushi Nakamura (Hiroshima Univ)\nWe improve our co
mputation of canonical partition functions $Z_n$ in lattice QCD at high te
mperature using method of Fourier transformation at imaginary chemical pot
ential. In particular\, we explain the appearance of negative $Z_n$ and fi
nd the way to avoid their appearance. We also suggest another method to co
mpute $Z_n$ at high temperature and demonstrate very good agreement betwee
n results obtained by two methods.\n\nhttps://indico.cern.ch/event/764552/
contributions/3420441/
LOCATION: Shimao 1A+1B
URL:https://indico.cern.ch/event/764552/contributions/3420441/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Details of a staggered fermion data analysis
DTSTART;VALUE=DATE-TIME:20190617T085000Z
DTEND;VALUE=DATE-TIME:20190617T091000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420487@indico.cern.ch
DESCRIPTION:Speakers: Maximilian Ammer (University of Wuppertal)\nWe prese
nt technical details of an analysis of pseudo-scalar data from a\nQCD simu
lation with staggered fermions. The data were obtained close to\nthe physi
cal point with an inverse lattice spacing of about 3 GeV\, and\n$N_f=2+1+1
$. We compare different methods of extracting effective masses\nand decay
constants in lattice units. The results of several correlated\nand uncorre
lated fitting methods are compared\, both on the simulated data\nset\, and
on a synthetically generated data set.\n\nhttps://indico.cern.ch/event/76
4552/contributions/3420487/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3420487/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thermal modifications of quarkonia and heavy quark diffusion from
a comparison of continuum-extrapolated lattice results to perturbative QCD
DTSTART;VALUE=DATE-TIME:20190619T012000Z
DTEND;VALUE=DATE-TIME:20190619T014000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420439@indico.cern.ch
DESCRIPTION:Speakers: Anna-Lena Kruse (Bielefeld University)\nWe will pres
ent our analysis of continuum extrapolated charmonium and bottomonium corr
elators calculated from very large and fine lattices in the pure SU(3) pla
sma using clover-improved Wilson valence quarks\, extending the study of t
he pseudo-scalar channel [1].\nTwo sources of systematic errors may arise
in the comparison. On the lattice side\, the renormalization constants are
not exactly known\, while on the perturbative side thermal mass shifts ap
pear. To account for this\, we introduce two factors\, an overall renormal
ization factor and a mass shift\, which are determined in a fit of the per
turbative model to the correlator. As a cross-check the results of this fi
t are then compared to MEM results. We begin with the investigation of the
pseudoscalar channel as done in [1] and extend the knowledge gained there
to the vector channel\, where in addition to the analysis of the thermal
modification of heavy quark bound states we try to get an estimate of the
heavy quark diffusion coefficient. \n\n[1] Y. Burnier\, H.-T. Ding\, O. Ka
czmarek\, A.-L. Kruse\, M. Laine\, H. Ohno\, H. Sandmeyer\, Thermal quarko
nium physics in the pseudoscalar channel. JHEP 2017\, 11\, 206\, doi:10.10
07/JHEP11(2017)206\n\nhttps://indico.cern.ch/event/764552/contributions/34
20439/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420439/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On the Lefschetz thimbles structure of the Thirring model
DTSTART;VALUE=DATE-TIME:20190618T070000Z
DTEND;VALUE=DATE-TIME:20190618T072000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420443@indico.cern.ch
DESCRIPTION:Speakers: Kevin Zambello (University of Parma and INFN\, Grupp
o Collegato di Parma)\nThe complexification of field variables is an elega
nt approach to attack the sign problem. In one approach one integrates on
Lefschetz thimbles: over them\, the imaginary part of the action stays con
stant and can be factored out of the integrals so that on each thimble the
sign problem disappears. However\, for systems in which more than one thi
mble contribute one is faced with the challenging task of collecting contr
ibutions coming from multiple thimbles.\nThe Thirring model is a nice play
ground to test multi-thimble integration techniques\; even in a low dimens
ional theory\, the thimble structure can be rich. It has been shown since
a few years that collecting the contribution of the dominant thimble is no
t enough to capture the full content of the theory. We report preliminary
results on reconstructing the complete results from multiple thimble simul
ations.\n\nhttps://indico.cern.ch/event/764552/contributions/3420443/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420443/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quarkonium suppression in non-equilibrium quark-gluon plasma
DTSTART;VALUE=DATE-TIME:20190618T105000Z
DTEND;VALUE=DATE-TIME:20190618T111000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420440@indico.cern.ch
DESCRIPTION:Speakers: Zhandos Moldabekov (Al Farabi Kazakh National Univer
sity)\nQuarkonium suppression in quark-gluon plasma has been investigated
since original work by Matsui and Satz [1]. This topic remains actual due
to the need of quark-gluon plasma diagnostics. In fact\, both quarkonium
suppression in quark-gluon plasma and recombination during hadronisation r
emain to be key open questions [2]. The bound state of quarkonium is th
eoretically well investigated in the case of equilibrium quark-gluon plasm
a [3]. However\, the experimentally produced quark-gluon plasmas is strong
ly non-equilibrium. Therefore\, in this work we present results for the qu
arkonium suppression in streaming quark-gluon plasmas. For this propose we
use the concept of dynamical screening using the dielectric function of c
ollisional quark-gluon plasma. \n\n[1] T. Matsui and H. Satz\, Physics Let
ters 178\, 416 (1986)\n[2] Jurgen Schukraft\, Nuclear Physics A 967\, 1 (2
017)\n[3] R. Rapp and X. Du\, Nuclear Physics A 967\, 216 (2017)\n\nhttps:
//indico.cern.ch/event/764552/contributions/3420440/
LOCATION: Foyer
URL:https://indico.cern.ch/event/764552/contributions/3420440/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Euclidean correlation functions of the topological charge density
DTSTART;VALUE=DATE-TIME:20190617T083000Z
DTEND;VALUE=DATE-TIME:20190617T085000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420445@indico.cern.ch
DESCRIPTION:Speakers: Lukas Mazur (Bielefeld University)\nWe will present
first results of our study of the Euclidean topological charge density cor
relator.\nIn order to get a well defined topological charge density and to
improve the signal of the correlators at large distances we make use of t
he gradient flow.\nWe investigate the flow-time dependence on large and fi
ne quenched lattices and compare to results of 2+1-flavor HISQ lattices. T
he final goal of this study is to perform a continuum extrapolation for th
e pure SU(3) plasma\, the relevance of the results to full QCD and to extr
act the related transport coefficient\, the sphaleron rate.\n\nhttps://ind
ico.cern.ch/event/764552/contributions/3420445/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420445/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Symmetries of the light hadron spectrum in high temperature QCD
DTSTART;VALUE=DATE-TIME:20190617T093000Z
DTEND;VALUE=DATE-TIME:20190617T095000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420448@indico.cern.ch
DESCRIPTION:Speakers: Christian Rohrhofer (Osaka University)\nProperties o
f QCD matter change significantly around the chiral crossover temperature\
, and the effects on $U(1)_A$ and topological susceptibilities\, as well a
s the meson spectrum have been studied with much care. Baryons and the eff
ect of parity doubling in this temperature range have been studied perviou
sly by various other groups employing different setups. Here we construct
suitable operators to investigate chiral and axial $U(1)$ symmetries in th
e baryon spectrum. Measurements are done with two flavors of chirally symm
etric domain-wall fermions at temperatures above the critical one\, for di
fferent volumes and quark-masses. The possibility of emergent $SU(4)$ and
$SU(2)_{CS}$ symmetries will be discussed.\n\nhttps://indico.cern.ch/event
/764552/contributions/3420448/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420448/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Simulating gauge theories on Lefschetz Thimbles
DTSTART;VALUE=DATE-TIME:20190618T072000Z
DTEND;VALUE=DATE-TIME:20190618T074000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420446@indico.cern.ch
DESCRIPTION:Speakers: Felix Andreas Ziesché ()\nLefschetz thimbles have b
een discussed recently as a possible solution to the complex action proble
m (sign problem) in Monte Carlo simulations. Here we discuss the structure
of Lefschetz thimbles for pure pure Yang-Mills theories with a complex ga
uge coupling $\\beta$ and show how the gauge degrees of freedom alter the
thimble decomposition. We propose to simulate such theories on the union o
f the tangential manifolds to the thimbles at all critical points. We cons
truct a local Metropolis-type algorithm\, that can either be constraint to
a specific thimble or simulate across thimbles. However\, the more thimbl
es are included in the simulation\, the larger will be the sign problem. W
e demonstrate the algorithm on a (1+1)-dimensional U(1) model. We also dis
cuss how\, starting from the main thimble result\, successive sub-leading
thimbles can be taken into account via a re-weighting approach.\n\nhttps:/
/indico.cern.ch/event/764552/contributions/3420446/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420446/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Applying Complex Langevin to Lattice QCD at finite mu.
DTSTART;VALUE=DATE-TIME:20190618T091000Z
DTEND;VALUE=DATE-TIME:20190618T093000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420450@indico.cern.ch
DESCRIPTION:Speakers: Donald Sinclair (Argonne National Laboratory)\nWe wi
ll present current status of our simulations of Lattice QCD at finite bary
on-number density using complex Langevin methods\, including use of action
s enhanced using dimension 6 operators.\n\nhttps://indico.cern.ch/event/76
4552/contributions/3420450/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420450/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Topological component of Yang-Mills fields: from lattice to collid
er
DTSTART;VALUE=DATE-TIME:20190620T060000Z
DTEND;VALUE=DATE-TIME:20190620T062000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420456@indico.cern.ch
DESCRIPTION:Speakers: Jinfeng Liao (Indiana University)\nIt has been long
and widely believed that topological configurations play crucial roles in
the nonperturbative phenomena of QCD and that of Yang-Mills fields in gene
ral. Unprecedented amount of high precision data from lattice gauge theori
es as well as from collider experiments at RHIC and LHC have provided oppo
rtunities for nailing down the topological component and characterizing i
ts properties. In this talk\, we discuss several examples of progress alon
g this line. We first show how the various features of confinement phase t
ransition in the SU(2) Yang-Mills theory can be quantitatively described b
y a statistical model of correlated instanton-dyon ensemble. We then demon
strate how the global RHIC+LHC data on jet energy loss observables unambig
uously points to the necessity of a non-perturbative topological component
in the quark-gluon plasma particularly in the vicinity of (pseudo-)transi
tion temperature. In the last part we briefly discuss the recent exiting p
rogress in the experimental search of gluon topological fluctuations via q
uark chirality dynamics that can be measured through anomalous transport p
rocesses such as the Chiral Magnetic Effect. \n[Refs] arXiv:1903.02684\; 1
808.05461\; 1804.01915\; 1711.02496\; 1611.04586\; 1611.02539.\n\nhttps://
indico.cern.ch/event/764552/contributions/3420456/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420456/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chiral magnetic effect in a lattice model
DTSTART;VALUE=DATE-TIME:20190620T070000Z
DTEND;VALUE=DATE-TIME:20190620T072000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420460@indico.cern.ch
DESCRIPTION:Speakers: Defu Hou (CCNU\, Wuhan)\nIn this talk\, we will pres
ent our study on the chiral magnetic effect in a lattice model. We study
analytically the one-loop contribution to the chiral magnetic effect (CME)
using lattice regularization with a Wilson fermion field. In the continuu
m limit\, we find that the chiral magnetic current vanishes at nonzero tem
perature but emerges at zero temperature consistent with that found by Pau
li-Villas regularization. For finite lattice size\, however\, the chiral m
agnetic current is nonvanishing at nonzero temperature. But the numerical
value of the coefficient of CME current is very small compared with that e
xtracted from the full QCD simulation for the same lattice parameters. The
possibility of higher-order corrections from QCD dynamics is also assesse
d.\n\nReference: B.Feng\, DF.Hou\, H.Liu\, HC. Ren\, et al\, PHYSICAL R
EVIEW D 95\, 114023 (2017)\n\nhttps://indico.cern.ch/event/764552/contribu
tions/3420460/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420460/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Phases of Thermal QCD
DTSTART;VALUE=DATE-TIME:20190620T091000Z
DTEND;VALUE=DATE-TIME:20190620T093000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420459@indico.cern.ch
DESCRIPTION:Speakers: Ivan Horvath (University of Kentucky)\nWe study ther
mal phases of QCD via scaling properties of glue fields at long spatial di
stances. Interesting phase structure emerges.\n\nhttps://indico.cern.ch/ev
ent/764552/contributions/3420459/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420459/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Partial Deconfinement
DTSTART;VALUE=DATE-TIME:20190621T085000Z
DTEND;VALUE=DATE-TIME:20190621T091000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420458@indico.cern.ch
DESCRIPTION:Speakers: Hiromasa WATANABE (University of Tsukuba)\nWe argue
the existence of “partially deconfined phase” in some SU(N) gauge theo
ries\, that is in between the confined and deconfined phases. \nWe charact
erize this phase in terms of the Polyakov line phases and study examples o
f theories in which the partially deconfined phase exists. We find that th
is phase is closely related to the Gross-Witten-Wadia phase transition.\nT
he partially deconfined phase is conjectured to be the counterpart of the
small black hole phase in the context of the gauge/string duality. We also
discuss possible applications in this context.\n\nhttps://indico.cern.ch/
event/764552/contributions/3420458/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420458/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The sign problem and the Lefschetz thimbles in two dimensional Hub
bard model
DTSTART;VALUE=DATE-TIME:20190618T074000Z
DTEND;VALUE=DATE-TIME:20190618T080000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420453@indico.cern.ch
DESCRIPTION:Speakers: Semeon Valgushev (Brookhaven National Laboratory)\nI
n the talk we discuss the sign problem and the possibility to alleviate it
with the help of methods related to Lefschetz thimbles in the space of co
mplexities field variables. In particular\, we consider two-dimensional Hu
bbard model at finite density. We analyze the model on the square lattice
combining semi-analytical study of saddle points and thimbles on a small l
attice and results of test Monte-Carlo simulations. We investigate differe
nt representations of the path integral and find a particular representati
on which supposedly leads to the presence of a single dominating thimble e
ven for larger lattices. Finally\, we derive a novel non-Gaussian represen
tation of the four-fermion interaction term\, which also exhibits decrease
d number of Lefschetz thimbles.\n\nhttps://indico.cern.ch/event/764552/con
tributions/3420453/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420453/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Constraining the phase diagram of QCD at finite temperature and de
nsity
DTSTART;VALUE=DATE-TIME:20190618T010000Z
DTEND;VALUE=DATE-TIME:20190618T014500Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420455@indico.cern.ch
DESCRIPTION:Speakers: Owe Philipsen (Goethe-University Frankfurt)\nBecause
of the severe sign problem afflicting lattice QCD at finite\nbaryon densi
ty\, still little is known from first principles about the\nphase diagram
as a function of temperature and baryon chemical potential.\nIn order to u
nderstand its relation\nto the underlying symmetries\, it is necessary to
study QCD in a wider\nparameter space with varying\nnumbers of flavours an
d quark masses and\, in particular\, the chiral limit.\nI review recent re
sults in QCD at finite temperature and/or density that\nhelp to constrain
the phase diagram of physical QCD.\n\nhttps://indico.cern.ch/event/764552/
contributions/3420455/
LOCATION: Wuchang + Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420455/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice QCD results on bottomonia at high temperatures
DTSTART;VALUE=DATE-TIME:20190618T113000Z
DTEND;VALUE=DATE-TIME:20190618T115000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420461@indico.cern.ch
DESCRIPTION:Speakers: Rasmus Larsen (Brookhaven Nationanl Laboratory)\nWe
explore the S- and P-states for bottomonia at high temperatures\, above th
e critical temperature $T_c$\, using non-relativistic QCD (NRQCD). We extr
act the spectrum as a function of temperature using smeared source correla
tors. We push to the limit of NRQCD for $N_ \\tau = 12$ which allows us to
find the bottomonium spectrum up to a temperature of 334MeV.\n\nhttps://i
ndico.cern.ch/event/764552/contributions/3420461/
LOCATION: Foyer
URL:https://indico.cern.ch/event/764552/contributions/3420461/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice study of meson properties at fine temperature using the tr
uncated overlap fermions
DTSTART;VALUE=DATE-TIME:20190618T113000Z
DTEND;VALUE=DATE-TIME:20190618T115000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420457@indico.cern.ch
DESCRIPTION:Speakers: Hiroaki Wada (Kokushikan University)\nWe study the m
eson properties at fine temperature using the quenched simulations with tr
uncated overlap fermion formalism. We explore the screening masses in rath
er heavy mass regions. We observe the tendency that the screening masses i
n all the channels are degenerate at high temperature.\n\nhttps://indico.c
ern.ch/event/764552/contributions/3420457/
LOCATION: Foyer
URL:https://indico.cern.ch/event/764552/contributions/3420457/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The S-wave $K\\pi$ amplitude and the $K^{\\star}_{0}(700)$ resonan
ce in $2+1$ flavor QCD
DTSTART;VALUE=DATE-TIME:20190618T064000Z
DTEND;VALUE=DATE-TIME:20190618T070000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420497@indico.cern.ch
DESCRIPTION:Speakers: Gumaro Rendon (University of Arizona)\nParameterizin
g low-lying scalar resonances remains a challenge. Such is the case for $K
^{\\star}_{0}(700)$ for which the near threshold experimental results for
the corresponding $K\\pi$ scattering amplitude are limited. However\, prod
uction channel data\, e.g. $D\\to K\\pi\\pi$\, from experiments BES and E7
91 show clearer evidence of the existence of this resonance. I will presen
t our results for the S and P-wave elastic scattering amplitudes obtained
from multi-hadron spectroscopy on the lattice using Lüscher's method. I w
ill comment on the dependence of the S-wave amplitude and the $K^{\\star}_
{0}(700)$ pole position\, if identifiable\, on the different parameterizat
ions. These calculations were done for two different ensembles with pion m
asses of $317(2)$ and $178(2)$ MeV. The need for these scattering amplitud
es for the infinite volume determination of $B\\to K\\pi \\ell^{+}\\ell^{-
}$ matrix elements is also discussed briefly.\n\nhttps://indico.cern.ch/ev
ent/764552/contributions/3420497/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3420497/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Resonances in coupled-channel meson-meson scattering from lattice
QCD
DTSTART;VALUE=DATE-TIME:20190618T070000Z
DTEND;VALUE=DATE-TIME:20190618T072000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420499@indico.cern.ch
DESCRIPTION:Speakers: David Wilson (Trinity College Dublin)\nRecent result
s will be presented of computations of meson-meson scattering processes in
several partial waves containing unstable resonances. We will cover $\\pi
K$ scattering at several pion masses from arXiv:1904.03188\, and an extra
ction of the $b_1$ resonance seen in dynamically-coupled $^3S_1$-$^3D_1$ $
\\pi\\omega$ scattering coupled to $\\pi\\phi$\, from arXiv:1904.04136.\n\
nhttps://indico.cern.ch/event/764552/contributions/3420499/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3420499/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Real-Time-Evolution of Heavy-Quarkonium Bound States
DTSTART;VALUE=DATE-TIME:20190619T031000Z
DTEND;VALUE=DATE-TIME:20190619T033000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420492@indico.cern.ch
DESCRIPTION:Speakers: Alexander Lehmann (University of Stavanger and Heide
lberg University)\nElucidating the production process of heavy quark bound
states is a central goal in heavy-ion collisions [1]. Two central questio
ns exist: Do bound states of heavy quarks form in the early time evolution
of the glasma? If so\, in which time regime can that happen? An answer re
quires the development of a non-perturbative treatment of the real-time-dy
namics of heavy quarkonia.\nTo answer those questions we have developed a
novel real-time formulation [2] of lattice NRQCD [3\,4] to order 1/(aMq)^2
where we employ a classical statistical simulation for the early-time dyn
amics of the gauge fields [5].\nHere we present results from a simulation
of heavy quarkonium dynamics in the glasma.\nBy computing the time-evoluti
on of spectral functions of heavy quarkonium channels we expect to identif
y the emergence of bound states and their formation time in the evolving g
lasma.\n[1] G. Aarts et al.\, Eur. Phys. J. A 53 no.5\, 93 (2017)\n[2] A.
L.\, A. Rothkopf (in preparation)\n[3] G.P. Lepage et al.\, Phys.Rev. D 46
\, 4052 (1992)\n[4] M. Berwein\, N. Brambilla\, S. Hwang\, A. Vairo\, TUM-
EFT 74/15\, 56 pp (2018)\n[5] K. Boguslasvki\, A. Kurkela\, T. Lappi\, J.
Peuron\, Phys.Rev. D98 no.1\, 014006 (2018)\n\nhttps://indico.cern.ch/even
t/764552/contributions/3420492/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420492/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Study of finite size effect on hadron masses and decay constants w
ith (5.4fm)^4 and (10.8 fm)^4 lattices at the physical point in 2+1 flavor
QCD
DTSTART;VALUE=DATE-TIME:20190620T070000Z
DTEND;VALUE=DATE-TIME:20190620T072000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420496@indico.cern.ch
DESCRIPTION:Speakers: Yoshinobu Kuramashi (University of Tsukuba)\nWe inve
stigate finite size effect on hadron masses and decay constants using a su
bset of the PACS10 configurations which are generated keeping the space-ti
me volumes over (10 fm)^4 at the physical point in 2+1 flavor QCD with the
Wilson-type quarks. We have tried two kinds of analyses fixing the $\\kap
pa$ values or the measured axial Ward identity quark masses. The finite si
ze effect is discussed by comparing the results on (5.4 fm)^4 and (10.8 fm
)^4 lattices at the cutoff scale of 1/a=2.333 GeV with emphasis on the pse
udoscalar meson sector and the Omega baryon.\n\nhttps://indico.cern.ch/eve
nt/764552/contributions/3420496/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3420496/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hadronic Tau deay and muon g-2
DTSTART;VALUE=DATE-TIME:20190618T085000Z
DTEND;VALUE=DATE-TIME:20190618T091000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420503@indico.cern.ch
DESCRIPTION:Speakers: Taku Izubuchi (Brookhaven National Laboratory)\nWe r
eport about calculations of hadronic decay of tau lepton and related topic
s for muon's anomalous magnetic moment.\n\nhttps://indico.cern.ch/event/76
4552/contributions/3420503/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420503/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hadron Spectroscopy from Lattice QCD
DTSTART;VALUE=DATE-TIME:20190617T011500Z
DTEND;VALUE=DATE-TIME:20190617T020000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420501@indico.cern.ch
DESCRIPTION:Speakers: Robert Edwards (Thomas Jefferson National Accelerato
r Facility)\nThere has been recent\, significant\, advances in the determi
nation of the hadron spectrum. Current efforts have focused on the develop
ment and application of finite-volume formalisms that allow for the determ
ination of scattering amplitudes as well as resonance behavior in coupled
channel systems. I will review some of these recent developments and outli
ne future directions of research.\n\nhttps://indico.cern.ch/event/764552/c
ontributions/3420501/
LOCATION: Wuchang + Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420501/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Periodic Pion-Pion Scattering at the Physical Point: Update
DTSTART;VALUE=DATE-TIME:20190618T074000Z
DTEND;VALUE=DATE-TIME:20190618T080000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420505@indico.cern.ch
DESCRIPTION:Speakers: Daniel Hoying (UConn/BNL)\nWe present updated result
s on the scattering of pseudoscalar\, vector\,\nand scalar mesons on a phy
sical pion mass\, 2+1 flavor mobius-DWF\,\nensemble with periodic boundary
conditions (PBCs) generated by the RBC\nand UKQCD collaborations. Using a
ll-to-all propagators\, we produce\nthousands of correlator momentum combi
nations. Energy spectra and phase\nshifts\, including excited states\, are
then extracted via the solutions\nof a generalized eigenvalue problem. I
ncluded in this talk will also\nbe an overview of improved analysis techni
ques and a second lattice spacing.\nThese studies are intended to serve as
groundwork for a full PBC\ncalculation of direct CP violation in K->pipi
later this year.\n\nhttps://indico.cern.ch/event/764552/contributions/3420
505/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3420505/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Recent results from BESIII experiment
DTSTART;VALUE=DATE-TIME:20190617T020000Z
DTEND;VALUE=DATE-TIME:20190617T023000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420506@indico.cern.ch
DESCRIPTION:Speakers: Changzheng YUAN (IHEP\, Beijing)\nBESIII is an exper
iment running at tau-charm energy region at the Beijing Electron Positron
Collider (BEPCII). Since the first data taking in 2009\, BESIII has accumu
lated the world's largest data samples of $D$ and $D_s$ meson decays\, 10
billion $J/\\psi$ and 450 million $\\psi(3686)$ events\, and about 100 mil
lion events with center-of-mass energy between 4 and 4.6 GeV for studies o
f nonstandard hadrons and the $\\Lambda_c$. In this talk\, the most recent
results on the exotic charmoniumlike XYZ states\, light hadron spectrosco
py\, the weak decays of the charmed hadrons will be reported. The measurem
ents where lattice QCD calculations are needed will be emphasized.\n\nhttp
s://indico.cern.ch/event/764552/contributions/3420506/
LOCATION: Wuchang + Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420506/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Matching Quasi Generalized Parton Distributions in the RI/MOM sche
me
DTSTART;VALUE=DATE-TIME:20190619T010000Z
DTEND;VALUE=DATE-TIME:20190619T012000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420511@indico.cern.ch
DESCRIPTION:Speakers: Yu-Sheng Liu (Tsung-Dao Lee Institute)\nWithin the f
ramework of large momentum effective theory (LaMET)\, generalized parton d
istributions (GPDs) can be extracted from lattice calculations of quasi-GP
Ds through a perturbative matching relation\, up to power corrections that
are suppressed by the hadron momentum. In this work\, we focus on isovect
or quark GPDs\, including the unpolarized\, longitudinally and transversel
y polarized cases\, and present the one-loop matching that connects the qu
asi-GPDs renormalized in a regularization-independent momentum subtraction
(RI/MOM) scheme to the GPDs in MS-bar scheme. We find that the matching c
oefficient is independent of the momentum transfer squared. As a consequen
ce\, the matching for the quasi-GPD with zero skewness is the same as that
for the quasi-PDF. Our results provide a crucial input for the determinat
ion of quark GPDs from lattice QCD using LaMET.\n\nhttps://indico.cern.ch/
event/764552/contributions/3420511/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420511/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Status of the muon g-2 hadronic vacuum polarization calculation by
RBC/UKQCD
DTSTART;VALUE=DATE-TIME:20190617T062000Z
DTEND;VALUE=DATE-TIME:20190617T064000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420513@indico.cern.ch
DESCRIPTION:Speakers: Christoph Lehner (Uni Regensburg\, BNL)\nI present t
he current status of the lattice QCD+QED calculation of the hadronic vacuu
m polarization contribution to the muon anomalous magnetic moment by RBC/U
KQCD\n\nhttps://indico.cern.ch/event/764552/contributions/3420513/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420513/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The hadronic contribution to the running of the electroweak mixing
angle
DTSTART;VALUE=DATE-TIME:20190617T070000Z
DTEND;VALUE=DATE-TIME:20190617T072000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420514@indico.cern.ch
DESCRIPTION:Speakers: Marco Cè (Johannes Gutenberg-Universität Mainz)\nT
he electroweak mixing angle\, or Weinberg angle\, $\\theta_{\\mathrm{W}}$
is a parameter of the Standard Model that parametrizes the mixing between
the electromagnetic and weak couplings.\nWe present a lattice study of the
leading hadronic contribution to the running of $\\sin^2\\theta_{\\mathrm
{W}}$\, given by the hadronic vacuum polarization (HVP) of the electromagn
etic current with the vector part of the weak neutral current\, estimated
using the time-momentum representation (TMR) method. Both connected and di
sconnected contributions have been computed on $N_{\\mathrm{f}}=2+1$ non-p
erturbatively $\\mathcal{O}(a)$-improved Wilson fermions ensembles from th
e Coordinated Lattice Simulations (CLS) initiative. The use of different l
attice spacings and quark masses allows us to reliably extrapolate the res
ults to the physical point.\n\nhttps://indico.cern.ch/event/764552/contrib
utions/3420514/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420514/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The hadronic contribution to the running of the electromagnetic co
upling
DTSTART;VALUE=DATE-TIME:20190617T072000Z
DTEND;VALUE=DATE-TIME:20190617T074000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420516@indico.cern.ch
DESCRIPTION:Speakers: Miguel Teseo San José Pérez (Johannes Gutenberg Un
iversität)\nThe electromagnetic coupling that intervenes in the interacti
ons between charged particles varies with the energy due to off-shell proc
esses. In this work we compute the leading hadronic contribution to this r
unning at low energies\, where QCD is fully non-perturbative.\n\nWe employ
a subset of CLS (Coordinated Lattice Simulations) ensembles with Nf = 2+1
and O(a) improved Wilson fermions in open boundary conditions in time and
periodic in space. For each ensemble we extracted the vacuum polarization
function\, which is proportional to the running\, using the time-momentum
representation. The set of ensembles has different particle masses and fo
ur lattice spacings\, in such a way that we have been able to perform the
chiral and continuum extrapolation.\n\nhttps://indico.cern.ch/event/764552
/contributions/3420516/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420516/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Recent developments in LQCD studies of hadron interactions
DTSTART;VALUE=DATE-TIME:20190621T021500Z
DTEND;VALUE=DATE-TIME:20190621T024500Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420510@indico.cern.ch
DESCRIPTION:Speakers: Michael Wagman (MIT)\nLattice gauge theory studies o
f hadron-hadron interactions\, hadron interactions with electroweak and be
yond the Standard Model currents\, and the structure of interacting multi-
hadron systems\, are providing qualitative insights into the dynamics of q
uarks and gluons as well as quantitative predictions for high-energy colli
ders\, medium-energy neutrino experiments\, low-energy searches for fundam
ental symmetry violation\, and everything in between. I will review some r
ecent work in these directions.\n\nhttps://indico.cern.ch/event/764552/con
tributions/3420510/
LOCATION: Wuchang + Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420510/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quasi-PDFs with twisted mass fermions
DTSTART;VALUE=DATE-TIME:20190619T014000Z
DTEND;VALUE=DATE-TIME:20190619T020000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420517@indico.cern.ch
DESCRIPTION:Speakers: Krzysztof Cichy ()\nWe discuss the recent progress i
n extracting PDFs from the quasi-PDF approach\, using twisted mass fermion
s. This concerns the investigation of several sources of systematic effect
s. Their careful analysis is a prerequisite to obtain precise determinatio
ns of PDFs from the lattice with realistic estimates of all uncertainties.
Moreover\, we present preliminary results from our new simulations at the
physical point. They involve\, additionally\, the dynamical strange and c
harm quarks\, as well as a larger volume and a smaller lattice spacing tha
n in our previous computations.\n\nhttps://indico.cern.ch/event/764552/con
tributions/3420517/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420517/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Two-current correlation functions for the nucleon on the lattice
DTSTART;VALUE=DATE-TIME:20190619T033000Z
DTEND;VALUE=DATE-TIME:20190619T035000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420518@indico.cern.ch
DESCRIPTION:Speakers: Christian Zimmermann ()\nWe calculate correlation fu
nctions of two local operators within the nucleon carrying momentum. We re
solve their dependence on the spatial distance of the currents. This is ca
rried out for all Wick contractions\, taking into account several operator
insertion types. The resulting four-point functions can be related to dou
ble parton distributions as well as to parton distribution functions. For
this first study\, we employ an $N_F = 2 + 1$ CLS ensemble on a $96 \\time
s 32^3$ lattice with lattice spacing $a = 0.0854\\ \\mathrm{fm}$ and the p
seudoscalar masses $m_\\pi = 356\\ \\mathrm{MeV}$ and $m_K = 442\\ \\mathr
m{MeV}$.\n\nhttps://indico.cern.ch/event/764552/contributions/3420518/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420518/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon isovector charges from physical mass domain-wall QCD
DTSTART;VALUE=DATE-TIME:20190620T060000Z
DTEND;VALUE=DATE-TIME:20190620T062000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420521@indico.cern.ch
DESCRIPTION:Speakers: Shigemi Ohta (KEK High Energy Accelerator Organizati
on)\nThe current status of nucleon isovector charges calculation from join
t LHP+RBC Collaborations using the 2+1-flavor dynamical domain-wall lattic
e QCD ensemble generated by joint RBC+UKQCD Collaborations at 1.730(4)-GeV
lattice cut off will be reported.\n\nhttps://indico.cern.ch/event/764552/
contributions/3420521/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420521/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Update from FNAL/HPQCD/MILC on the hadronic vacuum polarization co
ntribution to $(g-2)_\\mu$"
DTSTART;VALUE=DATE-TIME:20190617T064000Z
DTEND;VALUE=DATE-TIME:20190617T070000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420524@indico.cern.ch
DESCRIPTION:Speakers: Carleton DeTar (University of Utah)\nWe present an u
pdate on the Fermilab Lattice\, HPQCD\, and MILC Collaborations' ongoing c
alculations of the leading-order hadronic vacuum polarization contribution
to the anomalous magnetic moment of the muon. Our project employs ensembl
es with four flavors of highly improved staggered fermions\, physical ligh
t-quark masses\, and a range of lattice spacings of $a\\approx 0.06-0.15$~
fm.\n\nhttps://indico.cern.ch/event/764552/contributions/3420524/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420524/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hadronic vacuum polarization in finite volume using NNLO ChPT
DTSTART;VALUE=DATE-TIME:20190617T083000Z
DTEND;VALUE=DATE-TIME:20190617T085000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420528@indico.cern.ch
DESCRIPTION:Speakers: Christopher Aubin (Fordham University)\nWe present r
esults for the leading hadronic contribution to the muon g-2 from configur
ations with 2+1+1 flavors of HISQ quarks. The ensembles have been generate
d by the MILC collaboration at three lattice spacings. Using the time-mome
ntum representation of the electromagnetic current correlator\, we calcula
te the finite volume effects up to next-to-next-to-leading-order in Chiral
Perturbation Theory.\n\nhttps://indico.cern.ch/event/764552/contributions
/3420528/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420528/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Leading isospin breaking effects in the hadronic vacuum polarisati
on with open boundaries
DTSTART;VALUE=DATE-TIME:20190618T062000Z
DTEND;VALUE=DATE-TIME:20190618T064000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420522@indico.cern.ch
DESCRIPTION:Speakers: Andreas Risch (Universität Mainz)\, Hartmut Wittig
()\nWe discuss leading isospin breaking effects in the hadronic vacuum pol
arisation required for the investigation of the hadronic contribution to $
(g-2)_{\\mu}$. The calculation proceeds by expanding the relevant correlat
ion functions around the isosymmetric limit. Isosymmetric observables are
evaluated on CLS gauge ensembles with $N_{f}=2+1$\, $O(a)$ improved Wilson
fermions and open boundary conditions. A particular emphasis is placed on
the relevant quark-disconnected diagrams required for a complete treatmen
t of leading isospin breaking effects in the valence quark sector. We prov
ide a detailed discussion of the renormalisation of the vector current in
QCD+QED taking operator mixing into account.\n\nhttps://indico.cern.ch/eve
nt/764552/contributions/3420522/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420522/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QED corrections to hadronic observables
DTSTART;VALUE=DATE-TIME:20190618T091000Z
DTEND;VALUE=DATE-TIME:20190618T093000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420523@indico.cern.ch
DESCRIPTION:Speakers: Balint Toth (University of Wuppertal)\nWe use our Nf
=2+1+1 staggered lattice QCD configurations to compute the quantum electro
dynamics and strong isospin breaking corrections to various hadronic obser
vables. We use quark masses around their physical values\, and include QED
in our computations using the QED_L formulation.\n\nhttps://indico.cern.c
h/event/764552/contributions/3420523/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420523/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hadronic Tensor and Neutrino-Nucleon Scattering
DTSTART;VALUE=DATE-TIME:20190617T041500Z
DTEND;VALUE=DATE-TIME:20190617T044500Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420519@indico.cern.ch
DESCRIPTION:Speakers: Jian Liang (University of Kentucky)\nWe consider a n
ovel approach of calculating inclusive neutrino-nucleon scattering cross s
ections at low energies via the hadronic tensor on the lattice. This is re
levant to the neutrino-nucleus scattering experiments such as DUNE at Ferm
ilab. All the elastic\, resonance\, shallow and deep inelastic contributio
ns can be covered. The inverse problem encountered in the calculation and
several methods aiming to solve this problem is discussed. Nucleon form fa
ctors will be calculated using this approach to verify that the elastic sc
attering cross section from the form factors agrees with that from the had
ronic tensor.\n\nhttps://indico.cern.ch/event/764552/contributions/3420519
/
LOCATION: Wuchang + Hankou Room
URL:https://indico.cern.ch/event/764552/contributions/3420519/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pion Valence Quark from quasi-PDF and pseudo-PDF
DTSTART;VALUE=DATE-TIME:20190619T031000Z
DTEND;VALUE=DATE-TIME:20190619T033000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420538@indico.cern.ch
DESCRIPTION:Speakers: Charles Shugert (Stony Brook University and Brookhav
en National Lab)\nWe present results of the pion valence-quark PDF using q
uasi-PDF and pseudo-PDF\n methods. Using quasi-PDF's one relies on highly
-boosted hadronic states in order\n for LaMET to reliably match the quasi
-PDF to the light-cone PDF. Alternativly\n one can study pseudo PDF's\, F
ourier-transforms of the pseudo Ioffe-Time distribution\n from $\\nu$-spa
ce to x-space at fixed $z^2$ with $z$ being the quark-antiquark\n separat
ion. From here one can take the $z^2 \\rightarrow 0$ limit to obtain the\n
light-cone PDF. Benifits and drawbacks of each method are explored. This
\n calculation was done using a HISQ sea ensemble with Wilson-Clover vale
nce quarks\,\n on a $48^3\\times64$ size lattice with a lattice spacing $
a = 0.06$ fm\, using a $300$\n MEV pion mass.\n\nhttps://indico.cern.ch/e
vent/764552/contributions/3420538/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420538/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Scaling and higher twist in the nucleon Compton amplitude
DTSTART;VALUE=DATE-TIME:20190619T035000Z
DTEND;VALUE=DATE-TIME:20190619T041000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420536@indico.cern.ch
DESCRIPTION:Speakers: Ross Young (University of Adelaide)\nThe partonic st
ructure of hadrons plays an important role in a vast array of high-energy
and nuclear physics experiments. It also underpins the theoretical underst
anding of hadron structure. Recent developments in lattice QCD offer new o
pportunities for reliably studying partonic structure from first principle
s. He we report on the use of Feynman-Hellmann to study the forward Compto
n amplitude in the unphysical region. This amplitude provides direct const
raint on hadronic inelastic structure functions. The use of external momen
tum transfer allows us to study the $Q^2$ evolution to explore the onset o
f asymptotic scaling and reveal higher-twist effects in partonic structure
.\n\nhttps://indico.cern.ch/event/764552/contributions/3420536/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420536/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Updates on CalLat elastic nucleon form factors\, II
DTSTART;VALUE=DATE-TIME:20190620T070000Z
DTEND;VALUE=DATE-TIME:20190620T072000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420540@indico.cern.ch
DESCRIPTION:Speakers: Chia Cheng Chang (University of California\, Berkele
y)\nFollowing previous work on the calculation of the nucleon axial coupli
ng using domain-wall valence on HISQ gauge configurations\, I will present
an overview on our recent progress towards determining more general elast
ic nucleon form factors. These preliminary results will be based at heavie
r pion masses\, and will focus on overall computational and analysis strat
egy.\n\nhttps://indico.cern.ch/event/764552/contributions/3420540/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420540/
END:VEVENT
BEGIN:VEVENT
SUMMARY:CalLat elastic nucleon structure\, 1
DTSTART;VALUE=DATE-TIME:20190620T064000Z
DTEND;VALUE=DATE-TIME:20190620T070000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420541@indico.cern.ch
DESCRIPTION:Speakers: André Walker-Loud (Lawrence Berkeley National Labor
atory)\nI will discuss various aspects of the CalLat MDWF on gradient flow
ed HISQ program including an updated determination of the nucleon axial ch
arge along with a direct comparison with the more standard three-point fun
ction calculations.\n\nhttps://indico.cern.ch/event/764552/contributions/3
420541/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420541/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Review of results of recent nucleon structure & matrix element cal
culations
DTSTART;VALUE=DATE-TIME:20190620T010000Z
DTEND;VALUE=DATE-TIME:20190620T014500Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420543@indico.cern.ch
DESCRIPTION:Speakers: Tanmoy Bhattacharya (T-2)\nI will review recent latt
ice calculations of nucleon structure and matrix elements between nucleons
.\n\nhttps://indico.cern.ch/event/764552/contributions/3420543/
LOCATION: Wuchang + Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420543/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theoretical Developments of the LaMET Approach to Parton Physics
DTSTART;VALUE=DATE-TIME:20190618T031500Z
DTEND;VALUE=DATE-TIME:20190618T034500Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420539@indico.cern.ch
DESCRIPTION:Speakers: Yong Zhao (Massachusetts Institute of Techonology)\n
The large-moment effective theory (LaMET) is a systematic approach to extr
act light-cone parton distributions from equal-time matrix elements\, or q
uasi parton distributions\, that are calculable in lattice QCD. Recent yea
rs have seen rapid developments in the LaMET approach which have been appl
ied to various lattice calculations and led to much promising progress in
this field. In this talk\, I will describe the formalism of LaMET and its
extension to parton distributions for the transverse structures\, which ar
e essential steps in the road map to obtaining the three-dimensional tomog
raphy of the nucleon from lattice QCD.\n\nhttps://indico.cern.ch/event/764
552/contributions/3420539/
LOCATION: Wuchang + Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420539/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Developments in lattice computation of parton distributions
DTSTART;VALUE=DATE-TIME:20190618T034500Z
DTEND;VALUE=DATE-TIME:20190618T041500Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420535@indico.cern.ch
DESCRIPTION:Speakers: Nikhil Karthik (Brookhaven National Laboratory)\nI w
ill review the latest developments in lattice computations of the x-depend
ent parton structure of hadrons using quasi-PDF\, pseudo-PDF\, good lattic
e cross-section approach as well as using the moments of PDF. I will also
focus on the practical aspects of LaMET approach such as the validity of
1-loop perturbative matching\, control of the excited states of boosted ha
drons and the different approaches to the inverse problem of matching Eucl
idean quasi-PDFs to PDFs.\n\nhttps://indico.cern.ch/event/764552/contribut
ions/3420535/
LOCATION: Wuchang + Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420535/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Parton distribution functions of Delta^+ on the lattice
DTSTART;VALUE=DATE-TIME:20190618T111000Z
DTEND;VALUE=DATE-TIME:20190618T113000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420537@indico.cern.ch
DESCRIPTION:Speakers: Shicheng Xia (Peking University)\nWe present the unp
olaried parton distribution functions of $\\Delta^+$ baryon in lattice si
mulation based on large momentum effective theory. We use $N_f=2+1+1$ twis
t mass fermion with colver term and pion mass is 260 MeV. The simulation i
s done using fixed sink sequential inversion method with Gaussian-momentum
-smeared source while the largest baryon momentum is 1.2GeV .By comparing
the $\\bar{d}-\\bar{u}$ content in the proton with $\\Delta^+$ baryon\,the
role of chiral symmetry in generating the sea flaovr asymmetry is tested.
\n\nhttps://indico.cern.ch/event/764552/contributions/3420537/
LOCATION: Foyer
URL:https://indico.cern.ch/event/764552/contributions/3420537/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon Sigma Terms
DTSTART;VALUE=DATE-TIME:20190620T091000Z
DTEND;VALUE=DATE-TIME:20190620T093000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420549@indico.cern.ch
DESCRIPTION:Speakers: Lukas Varnhorst (University of Wuppertal)\nThe BMW c
ollaboration's recent calculation of the nucleon sigma terms\, based on th
e Feynman-Hellmann theorem\, will be presented. In different stages of the
calculation advantages of staggered and Wilson fermions are exploited by
fitting data generated with both fermion action. The fitting methods will
be explained and the implications of the findings for the quark masses' co
ntributions to the nucleon masses will be briefly discussed.\n\nhttps://in
dico.cern.ch/event/764552/contributions/3420549/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420549/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Developments in the position-space approach to the HLbL contributi
on to the muon $g-2$ on the lattice.
DTSTART;VALUE=DATE-TIME:20190618T070000Z
DTEND;VALUE=DATE-TIME:20190618T072000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420551@indico.cern.ch
DESCRIPTION:Speakers: Nils Asmussen (Uni Southampton)\nThe anomalous magne
tic moment shows a three to four standard deviations\ntension between its
experimental value and theory predictions\, and\ntherefore demands further
investigation. Experiments at Fermilab and\nJ-PARC aim to reduce the unce
rtainty by a factor of four. The\ntheoretical uncertainty has to be reduce
d in equal measure. It is\ndominated by the hadronic vacuum polarization (
HVP) and hadronic\nlight-by-light (HLbL) contribution. We will present dev
elopments in\nthe position-space approach to the HLbL contribution.\n\nhtt
ps://indico.cern.ch/event/764552/contributions/3420551/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420551/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quark momentum and angular momentum fractions at physical pion mas
s
DTSTART;VALUE=DATE-TIME:20190621T060000Z
DTEND;VALUE=DATE-TIME:20190621T062000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420548@indico.cern.ch
DESCRIPTION:Speakers: Gen Wang (University of Kentucky)\nWe present a prel
iminary calculation of the quark energy momentum tensor form factors $T_1(
Q^2)$ and $T_1(Q^2)+T_2(Q^2)$ at physical pion mass with valence overlap f
ermions on 2+1 flavor domain-wall $24^3\\times 64$ configurations with $a=
0.194\\ {\\rm{fm}}\,m_{\\pi}=137\\ {\\rm{MeV}}$ generated by RBC/UKQCD col
laboration. With z-expansion fits of the sum of connected and disconneted
contributions\, we extract the unrenormalized quark momentum and angular m
omentum fractions.\n\nhttps://indico.cern.ch/event/764552/contributions/34
20548/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420548/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon Charges and Form factors from 2+1 clover ensembles
DTSTART;VALUE=DATE-TIME:20190621T062000Z
DTEND;VALUE=DATE-TIME:20190621T064000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420556@indico.cern.ch
DESCRIPTION:Speakers: Sungwoo Park (Los Alamos National Laboratory)\nWe wi
ll present results on the nucleon charges and form factors on five ensembl
es generated using 2+1 clover fermions by the Jlab/W&M/LANL collaborations
. These results will be compared with similar calculations done using 2+1+
1 flavor HISQ ensembles.\n\nhttps://indico.cern.ch/event/764552/contributi
ons/3420556/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420556/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Structure functions from the Compton amplitude
DTSTART;VALUE=DATE-TIME:20190618T103000Z
DTEND;VALUE=DATE-TIME:20190618T105000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420555@indico.cern.ch
DESCRIPTION:Speakers: Holger Perlt (University of Leipzig)\nWe have initia
ted a program to compute the Compton amplitude with the Feynman-Hellman me
thod. This amplitude is related to the structure function via a Fredholm i
ntegral equation of the first kind. It is known that these types of equati
ons are inherently ill-posed - they are\, e.g.\, extremly sensitive to per
turbations of the system. We discuss some methods which are candidates to
handle these problems. Among them we investigate simple model-fitting\, si
ngular value decomposition and Bayesian approaches with the maximum entrop
y method. Special attention is drawn to the physical region of the omega p
arameter\, where we have to take the principal value.\n\nhttps://indico.ce
rn.ch/event/764552/contributions/3420555/
LOCATION: Foyer
URL:https://indico.cern.ch/event/764552/contributions/3420555/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Recent Developments of Muon g-2 from Lattice QCD
DTSTART;VALUE=DATE-TIME:20190621T010000Z
DTEND;VALUE=DATE-TIME:20190621T014500Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420546@indico.cern.ch
DESCRIPTION:Speakers: Vera Guelpers (University of Edinburgh)\nOne of the
most promising quantities for the search of signatures of physics beyond t
he Standard Model is the anomalous magnetic moment g-2 of the muon\, where
a comparison of the experimental result with the Standard Model estimate
yields a deviation of about 3.5 sigma. On the theory side\, the largest un
certainty arises from the hadronic sector\, namely the hadronic vacuum pol
arisation and the hadronic light-by-light scattering. I will review recent
progress in calculating the hadronic contributions to the muon g-2 from t
he lattice and discuss the prospects and challenges to match the precision
of the upcoming experiments.\n\nhttps://indico.cern.ch/event/764552/contr
ibutions/3420546/
LOCATION: Wuchang + Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420546/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Strong coupling constant and heavy quark masses in (2+1)-flavor QC
D
DTSTART;VALUE=DATE-TIME:20190617T064000Z
DTEND;VALUE=DATE-TIME:20190617T070000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420561@indico.cern.ch
DESCRIPTION:Speakers: Johannes Heinrich Weber (Michigan State University)\
nI present a determination of the strong coupling constant and heavy quark
masses in (2+1)-flavor QCD using lattice calculations with Highly Improve
d Staggered Quark (HISQ) action and calculate the moments of the pseudo-sc
alar quarkonium correlators at several values of the heavy valence quark m
ass. I determine the strong coupling constant in $\\overline{MS}$ scheme a
t four low energy scales corresponding to $m_c$\, $1.5m_c$\, $2m_c$ and $3
m_c$\, with $m_c$ being the charm quark mass. Using the moments and the $\
\Lambda_{\\overline{MS}}$ I determine the heavy quark masses in $\\overlin
e{MS}$ scheme. In a complementary calculation I determine the strong coupl
ing constant in (2+1)-flavor QCD using lattice calculations of the static
energy.\n\nhttps://indico.cern.ch/event/764552/contributions/3420561/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3420561/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-perturbative renormalization of Kaon B parameter using gradien
t flow
DTSTART;VALUE=DATE-TIME:20190618T085000Z
DTEND;VALUE=DATE-TIME:20190618T091000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420565@indico.cern.ch
DESCRIPTION:Speakers: Yusuke Taniguchi (University of Tsukuba)\nWe calcula
te the Kaon B parameter by using the Wilson type quark.\nWe adopt the grad
ient flow method as a non-perturbative renormalization scheme.\nThe calcul
ation is performed on Nf=2+1 full QCD configuration generated with the Iwa
saki gauge action and the non-perturbatively improved clover action.\nWe a
dopt a fine lattice spacing a=0.07 (fm).\nThe ud quark mass is rather heav
y with $m_{\\pi}/m_{\\rho}\\simeq0.63$ while the s quark mass is set to ap
proximately its physical value.\n\nhttps://indico.cern.ch/event/764552/con
tributions/3420565/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3420565/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Renormalization of bilinear and four-fermion operators through tem
poral moments
DTSTART;VALUE=DATE-TIME:20190617T085000Z
DTEND;VALUE=DATE-TIME:20190617T091000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420563@indico.cern.ch
DESCRIPTION:Speakers: Tsutomu Ishikawa (SOKENDAI\, KEK)\nWe propose a reno
rmalization scheme that can be simply implemented on the lattice. It consi
sts of the temporal moments of two-point and three-point functions calcula
ted with finite valence quark mass. The scheme is confirmed to yield a con
sistent result with another renormalization scheme in the continuum limit
for the bilinear currents. We apply a similar renormalization scheme for t
he non-perturbative renormalization of four-fermion operators appearing in
the weak effective Hamiltonian.\n\nhttps://indico.cern.ch/event/764552/co
ntributions/3420563/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3420563/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-perturbative matching of three/four-flavor Wilson coefficients
with a position-space procedure
DTSTART;VALUE=DATE-TIME:20190617T091000Z
DTEND;VALUE=DATE-TIME:20190617T093000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420564@indico.cern.ch
DESCRIPTION:Speakers: Masaaki Tomii ()\nWe construct a strategy to non-per
turbatively convert Wilson coefficients in the four-flavor theory to those
in the three-flavor theory. This non-perturbative matching is expected t
o reduce one of the biggest systematic uncertainties in RBC/UKQCD’s prev
ious $K \\to \\pi\\pi$ calculation\, where the matching was performed pert
urbatively at scales below the charm threshold. Since our method uses two
-point functions in position space\, which are a gauge-invariant and are f
ree from contact terms\, it prevents irrelevant mixing with gauge noninvar
iant operators and operators that vanish by the equations of motion.\nIn t
his talk\, we present the strategy and our preliminary results for the non
-perturbative matching of the Wilson coefficients that multiply the $\\Del
ta S = 1$ four-quark operators associated with $K \\to \\pi\\pi$ decays.\n
\nhttps://indico.cern.ch/event/764552/contributions/3420564/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3420564/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Calculation of PCAC mass with Wilson fermion using gradient flow
DTSTART;VALUE=DATE-TIME:20190618T083000Z
DTEND;VALUE=DATE-TIME:20190618T085000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420566@indico.cern.ch
DESCRIPTION:Speakers: Atsushi Baba (University of Tsukuba)\nWe calculate t
he PCAC mass for $N_f=2+1$ flavor full QCD with Wilson fermion. We adopt t
he gradient flow method as a non-perturbative renormalization scheme. Our
calculations are performed on two different mass parameters\; heavy ud qua
rk with $m_{\\pi}/m_{\\rho}\\simeq0.63$ and almost physical s quark\, and
physical quarks. We compare the results with those renormalized with the S
chrodinger functional scheme. We also present our preliminary calculation
performed on large ($L \\sim 5$ fm) lattice with physical quark mass.\n\nh
ttps://indico.cern.ch/event/764552/contributions/3420566/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3420566/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$\\chi$SF near the electroweak scale
DTSTART;VALUE=DATE-TIME:20190618T101000Z
DTEND;VALUE=DATE-TIME:20190618T103000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420568@indico.cern.ch
DESCRIPTION:Speakers: Andrew Lytle (INFN Rome Tor Vergata)\nWe employ the
chirally rotated Schroedinger functional ($\\chi$SF) to study two-point fe
rmion bilinear correlation functions used in determination of $Z_{A\,V\,S\
,P\,T}$\, on a series of well-tuned ensembles generated using the Schroedi
nger Functional (SF) and which span renormalisation scales from 4 to 70 Ge
V. We carry out a detailed comparison with the expectations from one-loop
perturbation theory.\n\nhttps://indico.cern.ch/event/764552/contributions/
3420568/
LOCATION: Foyer
URL:https://indico.cern.ch/event/764552/contributions/3420568/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Static force from lattice
DTSTART;VALUE=DATE-TIME:20190618T103000Z
DTEND;VALUE=DATE-TIME:20190618T105000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420562@indico.cern.ch
DESCRIPTION:Speakers: Viljami Leino (Technical University of Munich (TUM))
\nWe present an novel calculation of the static force directly from the la
ttice. Compared to the usual approach of taking derivatives of static pote
ntial\, a direct measurement of the force resolves the ambiguities related
to integration constants when comparing to pNRQCD expansion. We have perf
ormed a set of SU(3) pure gauge simulations using the multilevel algorithm
to test out\nthis procedure.\n\nhttps://indico.cern.ch/event/764552/contr
ibutions/3420562/
LOCATION: Foyer
URL:https://indico.cern.ch/event/764552/contributions/3420562/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dirac Eigenvalue spectrum of N f =2+1 QCD toward the chiral limit
using HISQ fermions
DTSTART;VALUE=DATE-TIME:20190617T064000Z
DTEND;VALUE=DATE-TIME:20190617T070000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420452@indico.cern.ch
DESCRIPTION:Speakers: Yu Zhang (Central China Normal University)\nWe utili
ze eigenvalue filtering technique combined with the stochastic estimate of
the mode number to determine the low-lying eigenvalue spectrum of the Dir
ac operator. Simulations are performed with (2 + 1)-flavor QCD using the H
ighly Improved Staggered Quarks (HISQ/tree) action on $N_{\\tau}$ = 8 and
12 lattices with aspect ratios $N_{\\sigma}/N_{\\tau}$ ranging from 5 to 7
. In our simulations the strange quark mass is fixed to its physical value
$m_{s}^{phy}$\, and the light quark masses $m_{l}$ are varied from $m_{s}
^{phy}/40$ to $m_{s}^{phy}/160$ which correspond to pion mass $m_{\\pi}$ r
anging from 110 MeV to 55 MeV in the continuum limit. We calculate the chi
ral condensate\, the disconnected chiral susceptibility\, and $\\chi_{\\pi
} - \\chi_{\\delta}$ from the eigenvalue spectrum via Banks-Casher relatio
ns. We compare these results with those obtained from a direct calculatio
n of the observables which involves inversions of the fermion matrix using
the stochastic "noise vector" method. We find that these approaches yield
consistent results. Furthermore\, we also investigate the quark mass and
temperature dependences of the Dirac eigenvalue density at zero eigenvalue
.\n\nhttps://indico.cern.ch/event/764552/contributions/3420452/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420452/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Polyakov loop susceptibility and correlators in the chiral limit
DTSTART;VALUE=DATE-TIME:20190617T070000Z
DTEND;VALUE=DATE-TIME:20190617T072000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420434@indico.cern.ch
DESCRIPTION:Speakers: David Clarke ()\nIn quenched QCD the Polyakov loop i
s an order parameter of the deconfinement transition\, but with decreasing
quark mass the peak in the Polyakov loop susceptibility becomes less pron
ounced and it loses its interpretation as an indicator for deconfinement.
In this study we examine the dependence of the susceptibility on the light
quark mass\, following it toward the chiral limit. In particular we are i
nterested in whether one finds a peak in the susceptibility in this limit
at all\, and therefore whether the susceptibility plays any role at the ch
iral phase transition. Closely related is an investigation of the dependen
ce of Polyakov loop correlations on light quark mass\; our preliminary res
ults show no dependence. From the Polyakov loop correlations one can calcu
late the singlet quark-antiquark free energy $F_1$\, and the Debye mass $m
_D$ can be extracted from its long-distance behavior. Extraction of $m_D$
is challenging because $F_1$ exhibits large statistical error bars at larg
e $r$. We attempt to improve the signal using the gradient flow\, which sh
ould leave long-range physics relatively unharmed.\n\nhttps://indico.cern.
ch/event/764552/contributions/3420434/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420434/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Conserved charge fluctuations with smaller-than-physical quark mas
ses
DTSTART;VALUE=DATE-TIME:20190617T072000Z
DTEND;VALUE=DATE-TIME:20190617T074000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420418@indico.cern.ch
DESCRIPTION:Speakers: Mugdha Sarkar (Bielefeld University)\nWe present res
ults from calculations of conserved charge fluctuations in (2+1)-flavor QC
D using light quark masses in the range $m_s/160 \\le m_l \\le m_s/27$\, w
ith the strange quark mass ($m_s$) kept fixed at its physical value. This
corresponds to a Goldstone pion mass in the range $55 MeV\\le m_\\pi \\le
140 MeV$. The measurements have been done using HISQ fermion discretizatio
n and Symanzik improved gauge action. We discuss the quark mass dependence
of up to 6th order cumulants and present first results on the separation
of singular and regular contributions to these cumulants. From these resul
ts\, we examine the nature of the chiral phase transition and the variatio
n of the curvature of the crossover line as we approach the chiral limit.\
n\nhttps://indico.cern.ch/event/764552/contributions/3420418/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420418/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Determination of the endpoint of the first order deconfiniement ph
ase transition in the heavy quark region of QCD
DTSTART;VALUE=DATE-TIME:20190617T074000Z
DTEND;VALUE=DATE-TIME:20190617T080000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420410@indico.cern.ch
DESCRIPTION:Speakers: Shinji Ejiri (Niigata University)\nWe study the endp
oint of the first order deconfinement phase transition of two and 2+1 flav
or QCD in the heavy quark region. We perform simulations of quenched QCD a
nd apply the reweighting method to study the heavy quark region. The quark
determinant for the reweighting is evaluated by a hopping parameter expan
sion. To reduce the overlap problem\, we introduce an external source term
of the Polyakov loop in the simulation. We study the location of critical
point at which the first order phase transition changes to crossover by i
nvestigating the histogram of the Polyakov loop and applying the finite-si
ze scaling analysis. We discuss the effect of the external source term on
the overlap problem. We also evaluate the truncation error of the hopping
parameter expansion\, and study the lattice spacing dependence and the spa
tial volume dependence in the result of the critical point.\n\nhttps://ind
ico.cern.ch/event/764552/contributions/3420410/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420410/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Evading the model sign problem in the PNJL model with repulsive ve
ctor-type interaction via path optimization
DTSTART;VALUE=DATE-TIME:20190619T010000Z
DTEND;VALUE=DATE-TIME:20190619T012000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420444@indico.cern.ch
DESCRIPTION:Speakers: Akira Ohnishi (Kyoto University)\nIt is important to
investigate the sign problem around the phase transition region\, where t
he sign problem is serious. We investigate the model sign problem in the P
olyakov loop extended Nambu-Jona-Lasinio (PNJL) model with repulsive vecto
r-type interaction at finite temperature and density by using the path opt
imization method [1]. The Polyakov loop and the repulsive vector-type inte
raction have been known to cause the model sign problem in the path integr
al [2\,3]. We have studied the sign problem in PNJL by using the path opti
mization method [2]\, in which the integration path in the complexified va
riable space is optimized to enhance the average phase factor [4\,5]. Sinc
e the vector-type interaction is necessary to explain the repulsion at hig
h density and also make the sign problem more serious\, we now investigate
the model including both the Polyakov loop and vector-type repulsion [1].
We find that the sign problem is more serious when we include both espec
ially around the phase transition region. We demonstrate that complexifica
tion of the temporal gluon field and the vector-type auxiliary field toget
her with optimizing the path can increase the average phase factor and we
can control the model sign problem. \n\n[1] K. Kashiwa\, Y. Mori\, A. Ohni
shi\, arXiv:1903.03679 [hep-ph].\n[2] K. Kashiwa\, Y. Mori\, A. Ohnishi\,
Phys. Rev. D 99 (2019)\, 014033 [arXiv:1805.08940 [hep-ph]].\n[3] Y. Mori\
, K. Kashiwa\, A. Ohnishi\, Phys. Lett. B 781 (2018)\, 688 [arXiv:1705.036
46 [hep-lat]].\n[4] Y. Mori\, K. Kashiwa\, A. Ohnishi\, Phys. Rev. D 96 (2
017)\, 111501(R [arXiv:1705.05605 [hep-lat]].\n[5] Y. Mori\, K. Kashiwa\,
A. Ohnishi\, Prog. Theor. Exp. Phys. 2018 (2018)\, 023B04 [arXiv:1709.0320
8 [hep-lat]].\n\nhttps://indico.cern.ch/event/764552/contributions/3420444
/
LOCATION: Shimao 1A+1B
URL:https://indico.cern.ch/event/764552/contributions/3420444/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Computing general observables in lattice models with complex actio
ns
DTSTART;VALUE=DATE-TIME:20190619T022000Z
DTEND;VALUE=DATE-TIME:20190619T024000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420436@indico.cern.ch
DESCRIPTION:Speakers: Olmo Francesconi (Swansea University & LPMMC Grenobl
e)\nThe study of QFTs at finite density is hindered by the presence of the
so-called sign problem. The action definition of such systems is\, in fac
t\, complex-valued making standard importance sampling Monte Carlo methods
ineffective.\nIn this work\, we shall review the generalized density of s
tates method for complex action systems and the Linear Logarithmic Relaxat
ion algorithm. We will focus on the recent developments regarding the bias
control of the LLR method and the evaluation of general observables in th
e DoS+LLR framework. Recent results on the well-known relativistic Bose ga
s will be presented\, proving that in our approach the phase factor can be
consistently evaluated over hundreds of orders of magnitude. A first expl
oratory study on the Thirring model in the DoS formalism will be presented
as well.\n\nhttps://indico.cern.ch/event/764552/contributions/3420436/
LOCATION: Shimao 1A+1B
URL:https://indico.cern.ch/event/764552/contributions/3420436/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Caloron gas\, quark localization and chiral symmetry in high-T QCD
DTSTART;VALUE=DATE-TIME:20190620T085000Z
DTEND;VALUE=DATE-TIME:20190620T091000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420433@indico.cern.ch
DESCRIPTION:Speakers: Tamas G. Kovacs (Institute for Nuclear Research\, De
brecen)\nAcross the finite temperature transition to the quark-gluon plasm
a\, the QCD\ntopological susceptibility decreases sharply. Thus in the hig
h temperature\nphase the remaining topological objects (possibly calorons)
form a weakly\ninteracting dilute gas. The overlap Dirac operator\, throu
gh its exact zero\nmodes\, allows one to measure the net topological charg
e. We show that\nseparately the number of positively and negatively charge
d topological objects\ncan also be extracted from the low-end of the overl
ap Dirac spectrum. We\nstudy the dynamics of these topological objects an
d speculate on how they\nmight affect quark localization and through that
deconfinement and chiral\nsymmetry restoration.\n\nhttps://indico.cern.ch/
event/764552/contributions/3420433/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420433/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Stress distribution in quark—anti-quark and single quark systems
at nonzero temperature
DTSTART;VALUE=DATE-TIME:20190621T062000Z
DTEND;VALUE=DATE-TIME:20190621T064000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3409218@indico.cern.ch
DESCRIPTION:Speakers: Ryosuke Yanagihara (Osaka University)\nWe explore th
e distribution of the energy momentum tensor (EMT) around quark—anti-qua
rk and single quark at nonzero temperature in SU(3) Yang-Mills gauge theor
y. This is an extension of our previous study [1] on the EMT distribution
in static quark—anti-quark systems in vacuum. We discuss the disappearan
ce of the flux tube structure observed in the vacuum simulation. We invest
igate the total stress acting on the mid-plane between a quark and an anti
-quark and show that it agrees with the force obtained from the derivative
of the free energy. The color Debye screening effect in the deconfined ph
ase is also discussed in terms of the EMT distribution.\n\n[1] R. Yanagiha
ra et al.\, Phys. Lett. B789 (2019) 210.\n\nhttps://indico.cern.ch/event/7
64552/contributions/3409218/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3409218/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-perturbative study of heavy quark anti-quark potential at fini
te temperature
DTSTART;VALUE=DATE-TIME:20190621T064000Z
DTEND;VALUE=DATE-TIME:20190621T070000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420427@indico.cern.ch
DESCRIPTION:Speakers: Dibyendu Bala (Tata Institute of Fundamental Researc
h)\nFor the phenomenology of quarkonia in quark-gluon plasma\, a convenien
t tool is to define an “in-medium potential”. Formally\, such a poten
tial can be defined through the long-time behavior of a timelike Wilson lo
op.\nA non-perturbative estimate of such a potential from lattice QCD is d
ifficult\, as on lattice we can only study Wilson loops in Euclidean time\
, in the range [0\, 1/T) where T is the temperature of the medium. The ana
lytical continuation to real time is involved\, and usually relies on Baye
sian analysis.\nHere we will present a new\, more direct method of extract
ion of the $Q \\bar{Q}$ potential from the Euclidean data. Results for th
e potential in a gluon plasma\, extracted from spatially smeared Wilson lo
ops calculated on anisotropic lattices\, will be presented. We will also
compare these results with those calculated from Coulomb gauge fixed Wilso
n line correlators.\nFor quarkonia phenomenology\, it is also important to
understand the nature of the medium binding\nfor the $Q \\bar{Q}$ in an o
ctet state. The octet state on the lattice is not gauge invariant. To make
it gauge invariant we have attached a gluonic operator with the link. We
will discuss the construction\, and present results for the $Q \\bar{Q}$ p
otential in this configuration.\n\nhttps://indico.cern.ch/event/764552/con
tributions/3420427/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420427/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pion-Pion Scattering with Elongated Boxes
DTSTART;VALUE=DATE-TIME:20190618T072000Z
DTEND;VALUE=DATE-TIME:20190618T074000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420500@indico.cern.ch
DESCRIPTION:Speakers: Chris Culver (George Washington University)\nThe pio
n-pion channel is the benchmark for lattice QCD scattering calculations. I
n the isospin limit\, three channels describe $\\pi\\pi$ scattering comple
tely\, having distinct properties in each channel. The attractive $I=0$ an
d $I=1$ channels are dominated by the broad $\\sigma$ and narrow $\\rho$ r
esonances\, respectively\, while the $I=2$ channel has no low energy reson
ance. Our group has calculated the $\\sigma$ and $\\rho$ resonance proper
ties using elongated boxes to scan the relevant kinematic region at two pi
on masses. Here we present new results for the isospin-2 channel\, thus c
ompleting the full study of $\\pi\\pi$ scattering. In addition\, we estab
lish a link to the physical point of all three channels simultaneously usi
ng the Inverse Amplitude Method.\n\nhttps://indico.cern.ch/event/764552/co
ntributions/3420500/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3420500/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Are dynamical charm quarks necessary?
DTSTART;VALUE=DATE-TIME:20190617T064000Z
DTEND;VALUE=DATE-TIME:20190617T070000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420485@indico.cern.ch
DESCRIPTION:Speakers: Tomasz Korzec (University of Wuppertal)\nLattice QCD
Simulations with Nf=2+1 dynamical quark flavors are quite common and\,\nd
ue to the decoupling of the charm quark\, sufficient for the study of low
energy physics with energies far below the charm threshold. However when u
sed in studies of charm physics\, the quenching of the heavy quarks may in
troduce large uncontrolled systematic uncertainties. To assess how big the
se effects might be on quantities like the charmonium spectrum\, the renor
malized charm quark mass and the charmonia decay constants\, we compare Nf
=0 QCD with Nf=2 QCD\, where the second theory contains two heavy quarks\,
with the mass of a charm quark. This setup\, without the light quarks\,
allows us to isolate the charm loop effects to a very high precision.\n\nh
ttps://indico.cern.ch/event/764552/contributions/3420485/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3420485/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Spectroscopy of mesons with bottom quarks
DTSTART;VALUE=DATE-TIME:20190617T072000Z
DTEND;VALUE=DATE-TIME:20190617T074000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420498@indico.cern.ch
DESCRIPTION:Speakers: Sinead Ryan (Trinity College Dublin)\nPreliminary re
sults for the spectra of excited and exotic hidden and open bottom mesons
are presented. The calculation on dynamical anisotropic ensembles exploits
distillation enabling the use of a large basis of interpolating operators
including operators proportional to the gluonic field strength which are
relevant for hybrid states. A comparison of results with similar calculati
ons in the light and charm sectors is made.\n\nhttps://indico.cern.ch/even
t/764552/contributions/3420498/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3420498/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Electromagnetic finite-size effects to the hadronic vacuum polaris
ation
DTSTART;VALUE=DATE-TIME:20190617T085000Z
DTEND;VALUE=DATE-TIME:20190617T091000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420515@indico.cern.ch
DESCRIPTION:Speakers: Nils Hermansson Truedsson (Lund University)\nThe pre
sent $3.5 \\\, \\sigma$ discrepancy between the theoretical prediction and
experimental value of the muon anomalous magnetic moment requires improve
d accuracy for both measurements and calculations. On the theory side\, th
e hadronic vacuum polarisation (HVP) is one of the main sources of uncerta
inty at the moment. This can be calculated in finite volume (FV) on the la
ttice\, and in order to reach sub-percent precision on the HVP\, $\\mathca
l{O}(\\alpha)$ electromagnetic corrections need to be added. Due to the ma
ssless nature of photons the FV effects go as a polynomial in $1/L$\, so i
ncluding QED on the lattice is potentially problematic. We have analytical
ly calculated the $1/L$ expansion of the HVP at NLO in the the electromagn
etic coupling in $\\textrm{QED}_{L}$ and found it to start at $1/L^{3}$\,
i.e. suppressed by one power as compared to the a priori possible $1/L^{2}
$. We have also shown that this is universal. The analytical $1/L$ expansi
on has been compared numerically with lattice perturbation theory as well
as lattice calculations and there is good agreement.\n\nhttps://indico.cer
n.ch/event/764552/contributions/3420515/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420515/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The leading hadronic vacuum polarization contribution to $(g-2)_{\
\mu}$ using $N_f=2+1$ O($a$) improved Wilson quarks
DTSTART;VALUE=DATE-TIME:20190618T064000Z
DTEND;VALUE=DATE-TIME:20190618T070000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420532@indico.cern.ch
DESCRIPTION:Speakers: Antoine Gérardin (John von Neumann Institute for Co
mputing\, DESY)\nWe present a lattice calculation of the leading hadronic
vacuum polarization\ncontribution to the muon anomalous magnetic moment. W
e use $N_f=2+1$ Wilson\nquarks and apply the O($a$)-improvement programme
to reduce discretization\neffects. Four lattice spacings with several valu
es of the pion mass down to\nits physical value are used to extrapolate to
the physical point.\nFor the connected light quark contribution\, affecte
d by the signal-to-noise\nratio problem at long distances\, we present an
auxiliary calculations of the\ntimelike pion form factor in order to bette
r constrain the tail of the\nisovector correlator and to correct its domin
ant finite-size effect.\nIn addition to the connected light\, strange and
charm quark contributions\,\nour final estimate also includes a calculatio
n of the quark disconnected\ncontribution. Finally\, we discuss prospects
and ongoing efforts for\ndetermining $a^{\\rm hvp}_{\\mu}$ with sub-percen
t precision.\n\nhttps://indico.cern.ch/event/764552/contributions/3420532/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420532/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Two-pion scattering amplitude from Bethe-Salpeter wave function at
the interaction boundary
DTSTART;VALUE=DATE-TIME:20190619T033000Z
DTEND;VALUE=DATE-TIME:20190619T035000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420484@indico.cern.ch
DESCRIPTION:Speakers: Takeshi Yamazaki ()\nWe observe that the ratio of th
e on-shell scattering amplitude to \nthe Bethe-Salpeter (BS) wave function
outside the interaction range \nis almost independent of time in our quen
ched calculation of the I=2 \ntwo-pion scattering with almost zero momentu
m. In order to discuss \nthe time independence\, we present a relation bet
ween the two-pion \nscattering amplitude and the surface term of the BS wa
ve function \nat the boundary of the interaction range. Using the relation
and some \nassumptions\, we show that the ratio is independent of time if
\nthe BS wave function in early time is given by some scattering states \n
with almost zero momentum.\n\nhttps://indico.cern.ch/event/764552/contribu
tions/3420484/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3420484/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Baryon interactions from lattice QCD at m_pi = 0.27 GeV
DTSTART;VALUE=DATE-TIME:20190619T041000Z
DTEND;VALUE=DATE-TIME:20190619T043000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420490@indico.cern.ch
DESCRIPTION:Speakers: Takumi Doi ()\nFirst-principles determination of bar
yon interactions plays a crucial role to build a bridge between particle\,
nuclear and astro-physics. In this talk\, we will give an overview for ou
r recent calculations at m_pi = 0.27 GeV\, where the interactions are extr
acted from Nambu-Bethe-Salpeter (NBS) correlators by the time-dependent HA
L QCD method. We also discuss quark mass dependence of baryon interactions
combined with results obtained near the physical quark masses and at heav
ier quark masses.\n\nhttps://indico.cern.ch/event/764552/contributions/342
0490/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3420490/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Charm CP & the lattice
DTSTART;VALUE=DATE-TIME:20190621T093000Z
DTEND;VALUE=DATE-TIME:20190621T095000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3421218@indico.cern.ch
DESCRIPTION:Speakers: Amarjit Soni (Amarjit)\nRecently LHCb announced a 5-
sigma exciting observation of direct CP in D0 decays to KK/pipi. Computati
ons of direct CP remain an outstanding important challenge for theory for
a variety of fundamental reasons. Here a rough estimate of the observed si
ze of the asymmetry will be explained. Although 1st principle calculations
of direct CP in D^0 to KK/pi pi cannot be done by known lattice methods\,
there are many features of the underlying dynamics that is being proposed
here that may well be amenable to lattice simulations and are strongly en
couraged\n\nhttps://indico.cern.ch/event/764552/contributions/3421218/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3421218/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Extraction of CKM matrix elements from lattice QCD results using d
ispersion relations
DTSTART;VALUE=DATE-TIME:20190618T062000Z
DTEND;VALUE=DATE-TIME:20190618T064000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3421225@indico.cern.ch
DESCRIPTION:Speakers: De-Liang Yao ()\nThe form factors in the semileptoni
c decays of heavy $B/D$ meson decays can be represented by dispersion rela
tions\, by which the kinematics in the decay region are related to the one
s in the scattering region. By fitting to the lattice QCD data on the form
factors\, the subtraction constants in their dispersive representations c
an be determined such that the form factors in the whole kinematical regio
n are obtained. Cabibbo–Kobayashi–Maskawa elements can be extracted wi
th form-factor values at $q^2=0$.\n\nhttps://indico.cern.ch/event/764552/c
ontributions/3421225/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3421225/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Study of intermediate states in the inclusive semi-leptonic B -> X
_c l \\nu decay structure functions
DTSTART;VALUE=DATE-TIME:20190618T064000Z
DTEND;VALUE=DATE-TIME:20190618T070000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3421226@indico.cern.ch
DESCRIPTION:Speakers: Gabriela Bailas ()\nWe analyze the inclusive semi-le
ptonic $B \\to X_c \\ell\\nu$ structure \nfunctions in 2+1-flavor lattice
QCD. The M\\"obius domain-wall fermion action is used for light\, strange\
, charm and bottom quarks. The structure function receives contributions f
rom various exclusive modes\, including the dominant S-wave states $D^{(*)
}_s$ as well as the P-wave states $D_s^{**}$. We can identify them in the
\nlattice data\, from which we put some constraints on the $B_s\\to D_s^{*
*}\\ell\\nu$ form factors.\n\nhttps://indico.cern.ch/event/764552/contribu
tions/3421226/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3421226/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Neutral meson mixing and related observables in the D(s) and B(s)
meson systems
DTSTART;VALUE=DATE-TIME:20190618T074000Z
DTEND;VALUE=DATE-TIME:20190618T080000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3421227@indico.cern.ch
DESCRIPTION:Speakers: J Tobias Tsang (The University of Edinburgh)\nIn thi
s talk we will give a brief review of our recent computation of ratios of
decay constants and neutral meson mixing parameters for $B_{(s)}$ and $D_{
(s)}$ mesons (1812.08791).\nWe will present our efforts to extend this cal
culation to the individual decay constants and bag parameters and outline
the wider heavy flavour physics Domain Wall Fermion program.\n\nhttps://in
dico.cern.ch/event/764552/contributions/3421227/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3421227/
END:VEVENT
BEGIN:VEVENT
SUMMARY:B-meson semileptonic form factors on (2+1+1)-flavor HISQ ensembles
DTSTART;VALUE=DATE-TIME:20190617T091000Z
DTEND;VALUE=DATE-TIME:20190617T093000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3421237@indico.cern.ch
DESCRIPTION:Speakers: Zechariah Gelzer (University of Illinois at Urbana-C
hampaign)\nWe report updates to an ongoing lattice-QCD calculation of the
form factors for the semileptonic decays $B \\to \\pi \\ell \\nu$\, $B_s
\\to K \\ell \\nu$\, $B \\to \\pi \\ell^+ \\ell^-$\, and $B \\to K
\\ell^+ \\ell^-$. The tree-level decays $B_{(s)} \\to \\pi (K) \\ell \\n
u$ enable precise determinations of the CKM matrix element $|V_{ub}|$\, wh
ile the flavor-changing neutral-current interactions $B \\to \\pi (K) \\el
l^+ \\ell^-$ are sensitive to contributions from new physics. This work us
es MILC's (2+1+1)-flavor HISQ ensembles at approximate lattice spacings be
tween $0.057$ and $0.15$ fm\, with physical sea-quark masses on four out o
f the seven ensembles. The valence sector is comprised of a clover $b$ qua
rk (in the Fermilab interpretation) and HISQ light and $s$ quarks. We pres
ent preliminary results for the form factors $f_0$\, $f_+$\, and $f_T$\, i
ncluding studies of systematic errors and $z$-expansion methods.\n\nhttps:
//indico.cern.ch/event/764552/contributions/3421237/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3421237/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$B \\to \\pi \\ell \\nu$ and $B \\to \\pi \\ell \\ell$ decay form
factors from HISQ/NRQCD valence quarks on the $N_f = 2+1$ asqtad ensembles
DTSTART;VALUE=DATE-TIME:20190617T093000Z
DTEND;VALUE=DATE-TIME:20190617T095000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3421238@indico.cern.ch
DESCRIPTION:Speakers: Chris Bouchard (University of Glasgow)\nForm factors
and related phenomenology for the $B \\to \\pi \\ell \\nu$ and $B \\to \\
pi \\ell \\ell$ decays will be presented. The simulations use HISQ light
and NRQCD $b$ valence quarks on the MILC $N_f = 2 + 1$ asqtad ensembles\,
with pion momenta covering the full kinematic range for the decays. Large
pion momenta (up to 2.6 GeV) data are analyzed via the hard pion ChPT mot
ivated modified $z$-expansion. The leading sources of uncertainty and the
next generation of calculations to address them will be discussed.\n\nhtt
ps://indico.cern.ch/event/764552/contributions/3421238/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3421238/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Semileptonic $D \\rightarrow K$ decay from full lattice QCD with H
ISQ
DTSTART;VALUE=DATE-TIME:20190618T083000Z
DTEND;VALUE=DATE-TIME:20190618T085000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3421243@indico.cern.ch
DESCRIPTION:Speakers: Bipasha Chakraborty (University of Cambridge)\nWe pr
esent a lattice QCD calculation of both scalar and vector form factors ass
ociated with the D→Klν semileptonic decay over full range of $q^2$. We
extract the central CKM matrix element\, $V_{cs}$ in the Standard Model\,
by comparing the lattice QCD results for the form factors and the experime
ntal decay rates. This calculation has been performed on the $N_f=2+1+1$ M
ILC HISQ ensembles including the ones with the physical light quark masses
.\n\nhttps://indico.cern.ch/event/764552/contributions/3421243/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3421243/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Electromagnetic corrections to leptonic pion decay from lattice QC
D using infinite-volume reconstruction method
DTSTART;VALUE=DATE-TIME:20190619T031000Z
DTEND;VALUE=DATE-TIME:20190619T033000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3421240@indico.cern.ch
DESCRIPTION:Speakers: Xu Feng (Peking University)\nWe present a lattice pr
ocedure to calculate the leptonic pion decay width with only exponentially
-suppressed finite-volume errors using the infinite-volume reconstruction
method. Three technical points: 1) the inclusion of pion wave function ren
ormalization factor\, 2) the cancellation of infared divergence and 3) the
connection between Euclidean-space correlation function and the relevant
matrix element in Minkowski space will be discussed.\n\nhttps://indico.cer
n.ch/event/764552/contributions/3421240/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3421240/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Two-photon decay of the neutral pion from a coordinate-space metho
d
DTSTART;VALUE=DATE-TIME:20190618T095000Z
DTEND;VALUE=DATE-TIME:20190618T101000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3421242@indico.cern.ch
DESCRIPTION:Speakers: Xu Feng (Peking University)\nThe conventional method
to calculate $\\pi\\to\\gamma\\gamma$ decay width is to study the momentu
m dependence of the pion form factor $F_{\\pi\\gamma\\gamma}(p^2\,q^2)$ wi
th $p$\, $q$ the momenta of two photons and perform an extrapolation to th
e on-shell limit\, $p^2\,q^2=0$. In alternative\, we propose a novel\, sim
ple approach to determine the decay width directly from the hadronic funct
ion in Euclidean coordinate space.\n\nhttps://indico.cern.ch/event/764552/
contributions/3421242/
LOCATION: Foyer
URL:https://indico.cern.ch/event/764552/contributions/3421242/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Neutrinoless Double Beta Decay Amplitude of pi- -> pi+ e e from In
finite-volume Reconstruction Method.
DTSTART;VALUE=DATE-TIME:20190618T095000Z
DTEND;VALUE=DATE-TIME:20190618T101000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3421241@indico.cern.ch
DESCRIPTION:Speakers: Xin-yu Tuo ()\nUsing the infinite volume reconstruct
ion method\, we present a lattice QCD calculation of neutrinoless double b
eta decay $\\pi^-\\to \\pi^+ ee$ with only exponentially suppressed finite
volume effects. We compare these results with the conventional $QED_L$ me
thod. Our calculation can provide the low-energy constants for chiral pert
urbation theory. Besides\, combining with our previous study on $\\pi^-\\p
i^-\\to ee$ decay\, these results can provide us a better understanding on
the double beta decay in the pion sector.\n\nhttps://indico.cern.ch/event
/764552/contributions/3421241/
LOCATION: Foyer
URL:https://indico.cern.ch/event/764552/contributions/3421241/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Stealth dark matter and gravitational waves
DTSTART;VALUE=DATE-TIME:20190619T020000Z
DTEND;VALUE=DATE-TIME:20190619T022000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428284@indico.cern.ch
DESCRIPTION:Speakers: David Schaich ()\nI will present ongoing investigati
ons into the finite-temperature dynamics of stealth dark matter\, which ad
ds to the standard model a new SU(4) gauge sector with four moderately hea
vy fundamental fermions. The lightest scalar SU(4) `baryon' is the compos
ite dark matter candidate. With the Lattice Strong Dynamics Collaboration
\, I am building on our past studies of direct detection and collider sear
ches for stealth dark matter by analyzing the early-universe SU(4) confine
ment transition\, which produces a stochastic background of gravitational
waves if it is first order. I will present the parameter space in which w
e observe such a first-order transition\, and discuss the quantities we ar
e analyzing in order to predict the resulting gravitational wave spectrum.
\n\nhttps://indico.cern.ch/event/764552/contributions/3428284/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3428284/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fits of SU(3) N_f=8 data to dilaton-pion effective field theory
DTSTART;VALUE=DATE-TIME:20190620T085000Z
DTEND;VALUE=DATE-TIME:20190620T091000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428289@indico.cern.ch
DESCRIPTION:Speakers: Maarten Golterman (San Francisco State University)\n
We report on fits of the SU(3) N_f=8 LSD spectral data to chiral\nperturba
tion theory with a dilatonic meson. These fits confirm that\ncurrent sim
ulations are in the ``large-mass'' regime\, with approximate\nhyperscaling
as the leading mass dependence. We find that the\nleading-order effect
ive field theory describes the data well. In\nparticular\, the effective
field theory allows us to understand the\nstaggered taste splitting\, exp
laining the pattern observed in the LSD\ndata\, which looks different from
QCD.\n\nhttps://indico.cern.ch/event/764552/contributions/3428289/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3428289/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Investigating Rare Kaon Decays with the All-to-All Method
DTSTART;VALUE=DATE-TIME:20190621T083000Z
DTEND;VALUE=DATE-TIME:20190621T085000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420571@indico.cern.ch
DESCRIPTION:Speakers: Fionn O hOgain ()\nThe rare kaon decay $K\\rightarro
w\\pi\\ell^{+}\\ell^{-}$ is a flavor changing neutral current process whic
h is forbidden at tree level in the Standard Model. The amplitude that des
cribes the long distance part of this decay is given in terms of the form
factor $V(z) = a + bz + V_{\\pi\\pi}(z)$\, where $z$ is the dilepton invar
iant mass in unit of the kaon mass and $V_{\\pi\\pi}$ is the long distance
two-pion contribution. This decay is currently being measured at the NA62
experiment in CERN. The values of $a$ and $b$ are known only through expe
rimental results\, though there are large uncertainties associated with th
em and only the absolute values are know.\n\nI will present preliminary re
sults of a lattice QCD calculation of $V(z)$ at the physical point using t
he "All-to-All" method. This method\, which has been implemented in the op
en source C++ framework\, Hadrons\, can generate arbitrary solutions to th
e Dirac equation by decomposing propagators into exact low modes of the op
erator and a stochastically sample high mode contribution.\n\nhttps://indi
co.cern.ch/event/764552/contributions/3420571/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3420571/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The $B \\to D^\\ast\\ell\\nu$ semileptonic decay at nonzero recoil
and its implications for $|V_cb|$ and $R(D^\\ast)$
DTSTART;VALUE=DATE-TIME:20190617T064000Z
DTEND;VALUE=DATE-TIME:20190617T070000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3421210@indico.cern.ch
DESCRIPTION:Speakers: Alejandro Vaquero Avilés-Casco (University of Utah)
\nWe present nearly final results from our analysis of the form factors fo
r $B \\to D^\\ast\\ell\\nu$ decay at nonzero recoil. Our analysis includes
15 MILC asqtad ensembles with $N_f$=2+1 flavors of sea quarks and lattice
spacings ranging from $a\\approx$ 0.15 fm down to 0.045 fm. The valence l
ight quarks employ the asqtad action\, whereas The b and c quarks are trea
ted using the Fermilab action. We discuss the impact that our results will
have on $|V_{cb}|$ and $R(D^\\ast)$\n\nhttps://indico.cern.ch/event/76455
2/contributions/3421210/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3421210/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$B \\to D^{(*)}\\ell\\nu$ form factors from lattice QCD with relat
ivistic heavy quarks
DTSTART;VALUE=DATE-TIME:20190617T070000Z
DTEND;VALUE=DATE-TIME:20190617T072000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3421222@indico.cern.ch
DESCRIPTION:Speakers: Takashi Kaneko (KEK)\nWe report on our calculation o
f the $B \\to D^{(*)}\\ell\\nu$ form factors\nin 2+1 flavor lattice QCD. T
he Moebius domain-wall action is employed\nfor light\, strange\, charm and
bottom quarks. At lattice cut-offs\n$a^{-1} \\sim $ 2.4\, 3.6 and 4.5 GeV
\, we simulate bottom quark masses\nup to 0.8 $a^{-1}$ to control discreti
zation errors. The pion mass\nis as low as 230 MeV. We discuss the heavy q
uark symmetry violation\nin the form factors extrapolated to the continuum
limit and\nphysical quark masses.\n\nhttps://indico.cern.ch/event/764552/
contributions/3421222/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3421222/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$B_c \\rightarrow B_{s(d)}$ form factors with NRQCD and HISQ
DTSTART;VALUE=DATE-TIME:20190617T072000Z
DTEND;VALUE=DATE-TIME:20190617T074000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3421217@indico.cern.ch
DESCRIPTION:Speakers: Laurence Cooper (University of Cambridge)\nWe presen
t results of the first lattice QCD calculation of $B_c \\rightarrow B_s$ a
nd $B_c \\rightarrow B_d$ vector matrix elements with 4-momentum transfer
across the entire physical range. Form factors are then extracted and comb
ined with CKM matrix elements to predict the decay rates for $B_c^+ \\righ
tarrow B_s^0 \\overline{l} \\nu_l$ and $B_c^+ \\rightarrow B^0 \\overline{
l} \\nu_l$. Results are derived from correlation functions computed with H
ISQ for light\, strange\, and charm quark propagators\, and NRQCD for the
bottom quark propagator. The calculation of correlation functions employs
MILC Collaboration ensembles over a range of three lattice spacings. These
gauge field configurations include HISQ sea quark effects of flavours cha
rm\, strange\, and equal-mass up and down. We use ensembles with physicall
y light up and down quarks\, as well as heavier values.\n\nhttps://indico.
cern.ch/event/764552/contributions/3421217/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3421217/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$B \\to \\pi\\ell\\nu$ form factors and $|V_{ub}|$ with Möbius do
main wall fermions
DTSTART;VALUE=DATE-TIME:20190617T083000Z
DTEND;VALUE=DATE-TIME:20190617T085000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3421224@indico.cern.ch
DESCRIPTION:Speakers: Jonna Koponen (KEK)\nWe report on the JLQCD Collabor
ation's calculation of form factors for the exclusive semileptonic decay o
f $B$ meson to pion on $2+1$-flavour lattices with lattice spacings from 0
.080 fm down to 0.044 fm. Using the Möbius domain wall fermion action for
both sea and valence quarks\, we simulate pions with masses down to 230
MeV. By utilizing a range of heavy quark masses up to 2.44 times the mass
of the charm quark we can extrapolate to the physical $b$ quark mass. We d
iscuss the dependence of the form factors on the pion mass\, heavy quark m
ass\, lattice spacing and the momentum-transfer. We extract the CKM matrix
element $|V_{ub}|$ through a simultaneous fit with the $B \\to \\pi$ diff
erential branching fractions provided by the Belle and BaBar collaboratio
ns after a chiral-continuum and physical b quark extrapolations of our lat
tice data.\n\nhttps://indico.cern.ch/event/764552/contributions/3421224/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3421224/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Semileptonic B decays with RHQ b quarks
DTSTART;VALUE=DATE-TIME:20190617T085000Z
DTEND;VALUE=DATE-TIME:20190617T091000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3421230@indico.cern.ch
DESCRIPTION:Speakers: Ryan Hill (University of Southampton)\nThis talk wil
l focus on RBC/UKQCD's most recent analysis for $B \\rightarrow \\pi l \\n
u$ and $B \\rightarrow D l \\nu$ semileptonic form factors. Heavy quarks
have been simulated with the Columbia formulation of the relativistic heav
y quark (RHQ) action\, and light quarks with a domain-wall fermion action.
The decays have been investigated over six ensembles. The form factor dep
endence on the three RHQ action parameters and its contribution to the err
or budget will be presented\, as well as preliminary results. This work fo
rms part of RBC/UKQCD's larger effort on predicting semileptonic $B_{(s)}$
decay form factors with RHQ b quarks.\n\nhttps://indico.cern.ch/event/764
552/contributions/3421230/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3421230/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Radiative leptonic decays on the lattice
DTSTART;VALUE=DATE-TIME:20190618T072000Z
DTEND;VALUE=DATE-TIME:20190618T074000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3421221@indico.cern.ch
DESCRIPTION:Speakers: Stefan Meinel (University of Arizona / RIKEN BNL Res
earch Center)\nAdding a hard photon to the final state of a leptonic pseud
oscalar-meson decay lifts the helicity suppression and can provide sensiti
vity to a larger set of operators in the weak effective Hamiltonian. Furth
ermore\, radiative leptonic B decays at high photon energy are well suited
to constrain the first inverse moment of the B-meson light-cone distribut
ion amplitude\, an important parameter in the theory of nonleptonic B deca
ys. We present our progress with lattice-QCD calculations of the hadronic
matrix elements describing radiative leptonic decays of light and heavy me
sons.\n\nhttps://indico.cern.ch/event/764552/contributions/3421221/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3421221/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice QCD estimate of the quark-gluon plasma photon emission rat
e
DTSTART;VALUE=DATE-TIME:20190619T041000Z
DTEND;VALUE=DATE-TIME:20190619T043000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420447@indico.cern.ch
DESCRIPTION:Speakers: Arianna Toniato (Universität Mainz)\nWe estimate th
e photon emission rate of the quark-gluon plasma in lattice\nQCD. At leadi
ng order in the electromagnetic coupling\, the photon rate is\nproportiona
l to the vector-channel spectral function evaluated on the light\ncone. Th
e determination of the spectral function from lattice correlator\ndata rep
resents an ill-posed problem\, which we address by introducing a Padé\nan
satz for the spectral function. We measure on the lattice a newly-proposed
\ncorrelation function\, suggesting physics-motivated constraints on the\n
parameters of the Padé ansatz. A previous analysis conducted at fixed\nsp
atial momentum provided preliminary constraints on the value of the\nphoto
n rate. We present new results obtained by a simultaneous analysis of\ndat
a at different spatial momenta.\n\nhttps://indico.cern.ch/event/764552/con
tributions/3420447/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420447/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Critical behavior of 4-dimensional Ising model with higher-order t
ensor renormalization group
DTSTART;VALUE=DATE-TIME:20190618T062000Z
DTEND;VALUE=DATE-TIME:20190618T064000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3425944@indico.cern.ch
DESCRIPTION:Speakers: Shinichiro Akiyama (Graduate School of Pure and Appl
ied Sciences\, University of Tsukuba)\nCritical behavior of 4-dimensional
Ising model has been attracting the interest of particle physicists for a
long time in the context of the triviality of the φ^4 theory. The perturb
ative renormalization group analysis predicts logarithmic corrections to t
he mean-field type of scaling properties for this model. Although a lot of
numerical work have been carried out to make a nonperturbative verificati
on of the logarithmic corrections\, it is still a difficult task to confir
m them. To this problem we apply the higher order tensor renormalization g
roup (HOTRG)\, which is one of the tensor network schemes allowing us to p
erform the finite size scaling study (FSS) with much larger volumes than t
he Monte Carlo simulations. We discuss a possible scenario for the phase t
ransition of this model.\n\nhttps://indico.cern.ch/event/764552/contributi
ons/3425944/
LOCATION: Shimao 1A+1B
URL:https://indico.cern.ch/event/764552/contributions/3425944/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Phase structure and real-time dynamics of the massive Thirring mod
el in 1+1 dimensions using the tensor-network method
DTSTART;VALUE=DATE-TIME:20190618T072000Z
DTEND;VALUE=DATE-TIME:20190618T074000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3425910@indico.cern.ch
DESCRIPTION:Speakers: C.-J. David Lin (National Chiao-Tung University)\nIn
this talk\, we present concluding results from our study of phase structu
re of the lattice version of the massive Thirring model in 1+1 dimensions.
Employing the method of matrix product state (MPS)\, several quantities
have been investigated\, leading to firm numerical evidence of a Kosterlit
z-Thouless phase transition. In particular\, we examine two correlators a
nd determine the relevant exponents. Exploratory results for real-time d
ynamics pertaining to this phase transition\, obtained using the approache
s of variational uniform MPS and time-dependent variational principle\, wi
ll also be discussed.\n\nhttps://indico.cern.ch/event/764552/contributions
/3425910/
LOCATION: Shimao 1A+1B
URL:https://indico.cern.ch/event/764552/contributions/3425910/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tensor network approach to real-time path integral
DTSTART;VALUE=DATE-TIME:20190618T070000Z
DTEND;VALUE=DATE-TIME:20190618T072000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3425912@indico.cern.ch
DESCRIPTION:Speakers: SHINJI TAKEDA (Kanazawa university)\nIn the talk\, I
will discuss how to obtain a tensor network representation for real-time
path integral. As an example\, I deal with 1+1 dimensional lattice scalar
field theory with the Minkowski metric. I show some numerical results to a
ssess the validity of the formulation.\n\nhttps://indico.cern.ch/event/764
552/contributions/3425912/
LOCATION: Shimao 1A+1B
URL:https://indico.cern.ch/event/764552/contributions/3425912/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Anomaly Inflow of the domain-wall fermion in odd dimension
DTSTART;VALUE=DATE-TIME:20190620T070000Z
DTEND;VALUE=DATE-TIME:20190620T072000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3425936@indico.cern.ch
DESCRIPTION:Speakers: Yoshiyuki Matsuki (Osaka University)\nA long ago\, C
allan and Harvey showed a view of gauge anomaly as\na missing current int
o an extra-dimension\, and the total contribution\,\nincluding the Chern-S
imons current in the bulk\, is conserved.\nBut in their computation\, the
edge and bulk contributions are separately\nevaluated and their cross corr
elations\, which should be relevant\nat boundary\, are simply ignored. In
this talk\, we revisit this issue\nwith a complete set of eigenstates of f
ree domain-wall Hamiltonian and study how\nthe gauge anomaly is canceled a
t the microscopic level.\n\nhttps://indico.cern.ch/event/764552/contributi
ons/3425936/
LOCATION: Shimao 1A+1B
URL:https://indico.cern.ch/event/764552/contributions/3425936/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum computing zeta-regularized vacuum expectation values
DTSTART;VALUE=DATE-TIME:20190622T031500Z
DTEND;VALUE=DATE-TIME:20190622T034500Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3425933@indico.cern.ch
DESCRIPTION:Speakers: Karl Jansen (NIC\, DESY)\nThe zeta-regularization al
lows to establish a\nconnection between Feynman’s path\nintegral and Fou
rier integral operator\nzeta-functions. This fact can be utilized to perfo
rm a\nregularization of vacuum expectation values in quantum field theorie
s.\nIn this talk\, we will describe the concept of this\nzeta-regularizati
on\, give a simple example and demonstrate\nthat quantum computing can be
employed to numerically evaluate\nzeta-regulated vacuum expectation values
.\n\nhttps://indico.cern.ch/event/764552/contributions/3425933/
LOCATION: Wuchang+Hankou
URL:https://indico.cern.ch/event/764552/contributions/3425933/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Entanglement suppression and emergent symmetry
DTSTART;VALUE=DATE-TIME:20190618T074000Z
DTEND;VALUE=DATE-TIME:20190618T080000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3425911@indico.cern.ch
DESCRIPTION:Speakers: David Kaplan ()\nSpin-flavor symmetries in hadronic
physics have been thought to follow from large-N. However\, lattice data
suggests an SU(16) spin-flavor symmetry for baryons in the SU(3) limit tha
t does not have a large-N explanation. We discuss how the enhanced symmet
ry corresponds to suppressed entanglement in scattering processes\, and co
njecture that the strong interactions may be dynamically suppressing entan
glement. One can imagine additional lattice tests of this hypothesis\, and
other places unexpected symmetries might arise.\n\nhttps://indico.cern.ch
/event/764552/contributions/3425911/
LOCATION: Shimao 1A+1B
URL:https://indico.cern.ch/event/764552/contributions/3425911/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tensor network formulation of quantum gravity
DTSTART;VALUE=DATE-TIME:20190619T014000Z
DTEND;VALUE=DATE-TIME:20190619T020000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3425913@indico.cern.ch
DESCRIPTION:Speakers: simon catterall ()\nIt is well known that the action
for General Relativity (GR) can be rewritten in terms of a tetrad field $
e_\\mu$ and a spin connection $\\omega_\\mu$ where the former\nis loosely
a square root of the metric and the latter is a gauge field\nneeded to ens
ure local Lorentz invariance. It is less well known that these\ntwo can be
combined into a single gauge field associated with local (anti)de Sitter\
nsymmetry with the resultant gauge theory reducing to GR in a Higgs phase.
In two\ndimensional Euclidean space the model appears as a novel form of
$SU(2)$ gauge theory which can be reformulated as a tensor network. We de
scribe analytic and numerical results obtained for this theory and its ext
ension to four dimensions.\n\nhttps://indico.cern.ch/event/764552/contribu
tions/3425913/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3425913/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Numerical study of ADE-type $\\mathcal{N}=2$ Landau--Ginzburg mode
ls
DTSTART;VALUE=DATE-TIME:20190621T070000Z
DTEND;VALUE=DATE-TIME:20190621T072000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3425941@indico.cern.ch
DESCRIPTION:Speakers: Okuto Morikawa (Kyushu University)\nIt is believed t
hat the two-dimensional massless $\\mathcal{N}=2$ Wess--Zumino model becom
es the $\\mathcal{N}=2$ superconformal field theory (SCFT) in the IR limit
. We examine this theoretical conjecture of the Landau--Ginzburg (LG) desc
ription of the $\\mathcal{N}=2$ SCFT by numerical simulations on the basis
of a supersymmetric-invariant momentum-cutoff regularization. We study on
e or two supermultiplets with various superpotentials. From a two-point co
rrelation function in the IR region\, we measure the central charge\, whic
h is consistent with the conjectured LG description of the ADE minimal mod
els. Our result supports the theoretical conjecture and\, at the same time
\, indicates a possible computational method of correlation functions in t
he $\\mathcal{N}=2$ SCFT from the LG description.\n\nhttps://indico.cern.c
h/event/764552/contributions/3425941/
LOCATION: Shimao 1A+1B
URL:https://indico.cern.ch/event/764552/contributions/3425941/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Stochastic RG and Gradient Flow in Scalar Field Theory
DTSTART;VALUE=DATE-TIME:20190617T074000Z
DTEND;VALUE=DATE-TIME:20190617T080000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3425922@indico.cern.ch
DESCRIPTION:Speakers: Andrea Carosso (University of Colorado Boulder)\nA r
enormalization group transformation defined as a simple stochastic process
is proposed\, and its relation to functional RG is described. The transfo
rmation leads to a new instantiation of Monte Carlo Renormalization Group
that is amenable to lattice simulation by performing a Langevin equation i
ntegration on top of the ensemble of bare fields generated by traditional
MCMC methods. The emergence of gradient flow (GF) as a means of computing
the quantities in the effective theory determined by the stochastic RG tra
nsformation will be outlined. Lastly\, preliminary results in the test cas
e of scalar fields in three dimensions is presented.\n\nhttps://indico.cer
n.ch/event/764552/contributions/3425922/
LOCATION: Shimao 1A+1B
URL:https://indico.cern.ch/event/764552/contributions/3425922/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Worldsheet formulation and topological terms in abelian lattice ga
uge theories
DTSTART;VALUE=DATE-TIME:20190620T062000Z
DTEND;VALUE=DATE-TIME:20190620T064000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3425917@indico.cern.ch
DESCRIPTION:Speakers: Maria Anosova (Karl-Franzens University of Graz)\nAb
elian lattice gauge theories can be reformulated exactly in terms of dual
variables which are discretized worldsheets. An interesting question is ho
w the topological terms can be incorporated in such a dual theory. We anal
yze the general structure of such terms and discuss some examples.\n\nhttp
s://indico.cern.ch/event/764552/contributions/3425917/
LOCATION: Shimao 1A+1B
URL:https://indico.cern.ch/event/764552/contributions/3425917/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Domain-wall fermion and Atiyah-Patodi-Singer index
DTSTART;VALUE=DATE-TIME:20190620T081000Z
DTEND;VALUE=DATE-TIME:20190620T083000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3425916@indico.cern.ch
DESCRIPTION:Speakers: Hidenori Fukaya (Osaka University)\nThe Atiyah-Patod
i-Singer index theorem describes the bulk-edge correspondence of symmetry
protected topological insulators. In 2017\, we showed that the same intege
r as the APS index can be obtained from the eta-invariant of the domain-wa
ll Dirac operator. In this work\, we invite three mathematicians to our gr
oup and prove that this correspondence is not a coincidence but generally
true.\n\nhttps://indico.cern.ch/event/764552/contributions/3425916/
LOCATION: Shimao 1A+1B
URL:https://indico.cern.ch/event/764552/contributions/3425916/
END:VEVENT
BEGIN:VEVENT
SUMMARY:New developments for worldline and worldsheet representations of l
attice field theories
DTSTART;VALUE=DATE-TIME:20190620T060000Z
DTEND;VALUE=DATE-TIME:20190620T062000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3425918@indico.cern.ch
DESCRIPTION:Speakers: Christof Gattringer (University of Graz)\nIn recent
years several lattice field theories were exactly rewritten in terms of so
-called dual variables which are worldlines for matter fields and worldshe
ets for the gauge degrees of freedom. I discuss recent developments within
this approach with a focus on topological terms and non-abelian symmetry
groups.\n\nhttps://indico.cern.ch/event/764552/contributions/3425918/
LOCATION: Shimao 1A+1B
URL:https://indico.cern.ch/event/764552/contributions/3425918/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-perturbative determination of anomalous dimensions of bound st
ates in QCD and beyond
DTSTART;VALUE=DATE-TIME:20190617T062000Z
DTEND;VALUE=DATE-TIME:20190617T064000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3425919@indico.cern.ch
DESCRIPTION:Speakers: Anna Hasenfratz (university of colorado boulder)\nAn
omalous dimensions of composite operators like the scalar\, tensor\, or ba
ryon are important\nto determine energy dependent renormalization constant
s. Until now only perturbative predictions were available.\nThe recent pro
posal [PRL 121 (2018) 201601] provides a non-perturbative determination of
anomalous dimensions in conformal systems\nby defining a continuous real-
space renormalization group transformation from gradient flow.\n\nIn this
work we generalize the method to determine the running anomalous dimension
s in QCD-like systems and\npresent results for the scalar\, tensor\, and b
aryon anomalous dimensions as the function of the\nrunning coupling up to
$g^2 \\approx 10$.\n\nWe also investigate the emergence of chiral-spin sym
metry suggested by Glozman et al.\n\nhttps://indico.cern.ch/event/764552/c
ontributions/3425919/
LOCATION: Shimao 1A+1B
URL:https://indico.cern.ch/event/764552/contributions/3425919/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tailoring Non-Abelian Gauge Theory for Digital Quantum Simulation
DTSTART;VALUE=DATE-TIME:20190619T012000Z
DTEND;VALUE=DATE-TIME:20190619T014000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3425942@indico.cern.ch
DESCRIPTION:Speakers: Jesse Stryker (Institute for Nuclear Theory)\nLattic
e gauge theory calculations exponentially hard on today's machines could b
ecome a reality with the advent of quantum computation. To get there\, th
e choice of variables optimal for exploiting the quantum advantage will li
kely be quite different than what we are accustomed to. We give a constru
ction of a non-Abelian gauge theory with quark matter using a loop-string
formulation that has many desirable features from the viewpoint of digital
quantum simulation. I will explain those features and why we believe thi
s reformulation is the optimal Kogut-Susskind-equivalent paradigm currentl
y available for simulation by universal quantum computers.\n\nhttps://indi
co.cern.ch/event/764552/contributions/3425942/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3425942/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The meson spectrum of large N gauge theories
DTSTART;VALUE=DATE-TIME:20190621T064000Z
DTEND;VALUE=DATE-TIME:20190621T070000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3425920@indico.cern.ch
DESCRIPTION:Speakers: Antonio Gonzalez-Arroyo (Instituto de Fisica Teoric
a UAM/CSIC)\nWe present results for meson masses in the continuum limit\nf
or pure Yang-Mills theory in the large N limit. The results are\nobtained
with both Wilson fermions and twisted mass. Some preliminary\nresults for
meson masses in large N gauge theories with dynamical\nfermions are also
given.\n\nhttps://indico.cern.ch/event/764552/contributions/3425920/
LOCATION: Shimao 1A+1B
URL:https://indico.cern.ch/event/764552/contributions/3425920/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A qubit realization of O(N) sigma models
DTSTART;VALUE=DATE-TIME:20190619T020000Z
DTEND;VALUE=DATE-TIME:20190619T022000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3425926@indico.cern.ch
DESCRIPTION:Speakers: Hersh Singh (Duke University)\nWe construct a qubit
formulation of the lattice $O(N)$ non-linear sigma model in $d+1$ dimensio
ns. For the $O(3)$ model\, our construction uses two qubits per lattice s
ite. We show that this Hamiltonian in two spatial dimensions has a quantu
m critical point where the well known scale invariant physics of the Wilso
n-Fisher fixed point is reproduced. Free massive bosons arise in three sp
atial dimensions. Simple modifications to our Hamiltonian also give us $O
(2)$ and $Z_2$ qubit models.\n\nhttps://indico.cern.ch/event/764552/contri
butions/3425926/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3425926/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The twisted gradient flow running coupling in SU(3): a non-perturb
ative determination
DTSTART;VALUE=DATE-TIME:20190617T072000Z
DTEND;VALUE=DATE-TIME:20190617T074000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3425927@indico.cern.ch
DESCRIPTION:Speakers: Eduardo I. Bribian (Instituto de Fisica Teorica UAM-
CSIC)\nWe report some preliminary results of our ongoing non-perturbative
computation of the twisted 't Hooft running coupling in a particular set-u
p\, using the gradient flow to define the coupling and step scaling techni
ques to compute it. For the computation we considered a pure gauge SU(3) t
heory in four dimensions\, defined on the lattice on an asymmetrical torus
endowed with twisted boundary conditions in a single plane\, and related
the energy scale of the coupling to an effective size combining the size o
f the torus and the rank of the gauge group. Additionally\, we explore som
e of the effects of the freezing of the topology on the computation of the
coupling.\n\nhttps://indico.cern.ch/event/764552/contributions/3425927/
LOCATION: Shimao 1A+1B
URL:https://indico.cern.ch/event/764552/contributions/3425927/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$(1+1)$-d $U(1)$ Quantum Link Models from Effective Hamiltonians o
f Dipolar Molecules
DTSTART;VALUE=DATE-TIME:20190619T010000Z
DTEND;VALUE=DATE-TIME:20190619T012000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3425946@indico.cern.ch
DESCRIPTION:Speakers: Jiayu Shen (University of Illinois at Urbana-Champai
gn)\nDipolar molecular platforms provide a possibility of realizing analog
quantum simulators for quantum field theories such as quantum link models
\, a discrete version of lattice field theories in terms of the degrees of
freedom for each link variable. We apply the method of effective Hamilton
ians to a system of dipolar molecules with electric dipole-dipole interact
ions with tunable parameters to obtain the $U(1)$ quantum link models in $
1+1$ dimensions.\n\nhttps://indico.cern.ch/event/764552/contributions/3425
946/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3425946/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Accessing 3D CFTs in Radial Quantization on the Lattice
DTSTART;VALUE=DATE-TIME:20190620T064000Z
DTEND;VALUE=DATE-TIME:20190620T070000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3425932@indico.cern.ch
DESCRIPTION:Speakers: Andrew David Gasbarro (Universität Bern)\nCardy (19
85) pointed out that radial quantization may provide a useful numerical ap
proach to study CFTs compared to traditional finite size scaling technique
s. The problem that the cylindrical manifold $R \\times S^{d-1}$ is curve
d for $d > 2$ has been ameliorated -- and perhaps solved -- for renormaliz
able QFTs by the development of the quantum finite element (QFE) method in
recent years. QFE provides a nonperturbative lattice regularization for
renormalizable QFT on an arbitrary smooth Riemannian manifold. We present
results for the 3D Ising fixed point in real scalar $\\phi^4$ theory\, fo
cusing on the recovery of isometries in the continuum limit and the extrac
tion of some initial nonperturbative CFT data. We also discuss an alterna
tive approach to extracting conformal scaling dimensions by making connect
ion with the large charge expansion\, and an effort to study the $O(N)$ mo
del in radial lattice quantization at finite density.\n\nhttps://indico.ce
rn.ch/event/764552/contributions/3425932/
LOCATION: Shimao 1A+1B
URL:https://indico.cern.ch/event/764552/contributions/3425932/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tensor network study of two dimensional complex $\\phi^{4}$ theory
at finite density
DTSTART;VALUE=DATE-TIME:20190618T064000Z
DTEND;VALUE=DATE-TIME:20190618T070000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3425928@indico.cern.ch
DESCRIPTION:Speakers: Ryo Sakai (Kanazawa University)\nWe study the comple
x $\\phi^{4}$ theory with finite chemical potential. To closely understand
nontrivial effects such as the Silver Blaze phenomenon\, experimental stu
dies on the lattice will give some knowledge\; however\, on account of the
finite chemical potential\, there is a sign problem in Monte Carlo simula
tions. In this study\, to overcome the problem\, the tensor renormalizatio
n group approach is employed\, and we give some numerical results surround
ing the phenomena in the finite density system.\n\nhttps://indico.cern.ch/
event/764552/contributions/3425928/
LOCATION: Shimao 1A+1B
URL:https://indico.cern.ch/event/764552/contributions/3425928/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Stabilised Wilson fermions for QCD on very large lattices
DTSTART;VALUE=DATE-TIME:20190620T072000Z
DTEND;VALUE=DATE-TIME:20190620T074000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3425930@indico.cern.ch
DESCRIPTION:Speakers: Patrick Fritzsch (CERN)\nRough gauge fields are an o
bstacle in large-scale dynamical fermion simulations with Wilson quarks wh
en the pion mass is lowered and the gap of the lattice Dirac operator shri
nks. In this talk\, a reformulation of the O(a) improved Wilson-Dirac oper
ator is given which is largely protected from numerical instabilities duri
ng the molecular dynamics evolution. First results are very promising as p
hysical-point simulations in three-flavour QCD at lattice spacings as larg
e as 0.095 fm become feasible. The implementation comes without additional
cost and is a crucial ingredient towards master-field simulations with fe
rmions.\n\nhttps://indico.cern.ch/event/764552/contributions/3425930/
LOCATION: Shimao 1A+1B
URL:https://indico.cern.ch/event/764552/contributions/3425930/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gradient flow equation in SQCD
DTSTART;VALUE=DATE-TIME:20190617T070000Z
DTEND;VALUE=DATE-TIME:20190617T072000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3425929@indico.cern.ch
DESCRIPTION:Speakers: Daisuke Kadoh (Chulalongkorn)\nWe construct a gradie
nt flow equation in N=1 SQCD. The flow is supersymmetric in a sense that t
he flow time and the supersymmetry transformation commute with each other
up to a gauge transformation. We also discuss the UV property of flowed co
rrelators.\n\nhttps://indico.cern.ch/event/764552/contributions/3425929/
LOCATION: Shimao 1A+1B
URL:https://indico.cern.ch/event/764552/contributions/3425929/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Atiyah-Patodi-Singer index theorem on a lattice
DTSTART;VALUE=DATE-TIME:20190620T083000Z
DTEND;VALUE=DATE-TIME:20190620T085000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3425935@indico.cern.ch
DESCRIPTION:Speakers: Naoki Kawai (Osaka University)\nAtiyah-Singer index
theorem on a lattice without boundary is well understood owing to the se
minal work by Hasenfratz.\nBut its extension to the system with boundary (
the so-called Atiyah-Patodi-Singer index theorem)\, which surprisingly pl
ays a crucial role in T-anomaly cancellation between bulk- and edge-modes
in 3+1 dimensional topological matters\, is known only in the continuum t
heory and no lattice realization has been made so far.\nIn this work\, we
try to non-perturbatively define an alternative index from the lattice do
main-wall fermion in 3+1 dimensions. We will show that this new index in t
he continuum limit\, converges tothe Atiyah-Patodi-Singer index defined on
a manifold with boundary\, which coincides with the surface of the domain
-wall.\n\nhttps://indico.cern.ch/event/764552/contributions/3425935/
LOCATION: Shimao 1A+1B
URL:https://indico.cern.ch/event/764552/contributions/3425935/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Spectral Methods and Running Scales in Causal Dynamical Triangulat
ions
DTSTART;VALUE=DATE-TIME:20190621T062000Z
DTEND;VALUE=DATE-TIME:20190621T064000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3425950@indico.cern.ch
DESCRIPTION:Speakers: Giuseppe Clemente (INFN - National Institute for Nuc
lear Physics)\nWe will present recent results of the application of spectr
al analysis\nin the setting of the Monte Carlo approach to Quantum Gravity
known as\nCausal Dynamical Triangulations (CDT)\, discussing the behaviou
r of the\nlowest lying eigenvalues of the Laplace-Beltrami operator comput
ed on\nspatial slices. We will show that such a kind of analysis can provi
de\ninformation about running scales of the theory and about the critical\
nbehaviour around a possible second order transition in the CDT phase\ndia
gram\, where a continuum limit could be defined.\n\nhttps://indico.cern.ch
/event/764552/contributions/3425950/
LOCATION: Shimao 1A+1B
URL:https://indico.cern.ch/event/764552/contributions/3425950/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Resurgence and fractional instanton of the SU(3) gauge theory in w
eak coupling regime
DTSTART;VALUE=DATE-TIME:20190618T091000Z
DTEND;VALUE=DATE-TIME:20190618T093000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3425907@indico.cern.ch
DESCRIPTION:Speakers: Etsuko Itou (Keio University)\nMotivated by recent s
tudies on the resurgence structure of quantum field theories\, we numerica
lly study the nonperturbative phenomena of the SU(3) gauge theory in a wea
k coupling regime. We find that topological objects with a fractional char
ge emerge if the theory is regularized by an infrared (IR) cutoff via the
twisted boundary conditions. Some configurations with nonzero instanton nu
mber are generated as a semi-classical configuration in the Monte Carlo si
mulation even in the weak coupling regime. Furthermore\, some of them cons
ist of multiple fractional-instantons. We also measure the Polyakov loop t
o investigate the center symmetry and confinement. The fractional-instanto
n corresponds to a solution linking two of degenerate Z3-broken vacua in t
he deconfinement phase.\n\nhttps://indico.cern.ch/event/764552/contributio
ns/3425907/
LOCATION: Shimao 1A+1B
URL:https://indico.cern.ch/event/764552/contributions/3425907/
END:VEVENT
BEGIN:VEVENT
SUMMARY:TKNN formula for general lattice Hamiltonian in odd dimensions
DTSTART;VALUE=DATE-TIME:20190621T060000Z
DTEND;VALUE=DATE-TIME:20190621T062000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3425914@indico.cern.ch
DESCRIPTION:Speakers: Tetsuya Onogi (Osaka University)\nTopological insula
tors in odd dimensions are characterized by topological numbers. We prove
the well-known relation between the topological number given by the Chern
character of the Berry curvature and the Chern-Simons level of the low en
ergy effective action for a general class of Hamiltonians bilinear in the
fermion with general U(1) gauge interactions including non-minimal couplin
gs by an explicit calculation. A series of Ward-Takahashi identities are c
rucial to relate the Chern-Simons level to a winding number\, which could
then be directly reduced to Chern character of Berry curvature by carrying
out the integral over the temporal momenta.\n\nhttps://indico.cern.ch/eve
nt/764552/contributions/3425914/
LOCATION: Shimao 1A+1B
URL:https://indico.cern.ch/event/764552/contributions/3425914/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards the determination of the charm quark mass on $N_\\mathrm{f
}=2+1$ CLS ensembles
DTSTART;VALUE=DATE-TIME:20190617T062000Z
DTEND;VALUE=DATE-TIME:20190617T064000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420560@indico.cern.ch
DESCRIPTION:Speakers: Simon Kuberski (Münster University)\nWe present the
current status of our determination of the charm quark mass using $N_\\ma
thrm{f}=2+1$ dynamical\, non-perturbatively $\\mathrm{O}(a)$-improved Wils
on fermions. A subset of CLS ensembles with four different lattice spacing
s along the $\\mathrm{Tr}[M_q]=\\mathrm{const.}$ trajectory is used.\nFor
the computation of the correlation functions involving valence charm quar
k propagators we employ distance preconditioning to gain the necessary pre
cision. To stabilize the extrapolations to the physical point\, we conside
r different definitions of the bare charm quark mass and corresponding ren
ormalization procedures.\n\nhttps://indico.cern.ch/event/764552/contributi
ons/3420560/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3420560/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-perturbative renormalization of $\\mathrm{O}(a)$ improved tens
or currents
DTSTART;VALUE=DATE-TIME:20190618T091000Z
DTEND;VALUE=DATE-TIME:20190618T093000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420570@indico.cern.ch
DESCRIPTION:Speakers: Fabian Joswig (Westfälische Wilhelms-Universität)\
nWe present our progress on the non-perturbative $\\mathrm{O}(a)$ improvem
ent and renormalization of tensor currents in three flavor lattice QCD wit
h Wilson-clover fermions and tree-level Symanzik improved gauge action. Wh
ile the $\\mathrm{O}(a)$ improvement factor of the tensor currents is dete
rmined via a Ward identity approach\, their RG group running is calculated
via recursive finite-size scaling techniques\, both implemented within th
e Schrödinger functional framework. We also address the matching factor b
etween bare and renormalization group invariant currents for a range of la
ttice spacings relevant for applications from large-volume simulations.\n\
nhttps://indico.cern.ch/event/764552/contributions/3420570/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3420570/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Vector current renormalisation in momentum subtraction schemes usi
ng the HISQ action
DTSTART;VALUE=DATE-TIME:20190617T083000Z
DTEND;VALUE=DATE-TIME:20190617T085000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420559@indico.cern.ch
DESCRIPTION:Speakers: Daniel Hatton (University of Glasgow)\nAs the only l
attice vector current that does not require renormalisation is the point-s
plit conserved current it is convenient to have a robust\, precise and com
putationally cheap methodology for the calculation of vector current renor
malisation factors\, $Z_V$. Momentum subtraction schemes\, such as RI-SMOM
\, implemented nonperturbatively on the lattice provide such a method if i
t can be shown that the systematic errors\, e.g. from condensates\, are we
ll controlled. \nWe present $Z_V$ calculations in a variety of momentum su
btraction schemes and for a variety of currents including the conserved cu
rrent\, using the HISQ action. We compare the results with each other\, wi
th previous HISQ determinations using form factors at $q^2=0$ and with per
turbation theory. Our results show that momentum subtraction schemes\, sui
tably defined\, allow for good control of $Z_V$ determination at small lat
tice spacings as well as the inclusion of electromagnetic effects. Both of
these are potentially important for the Fermilab/HPQCD/MILC programme to
calculate the leading order hadronic vacuum polarisation contribution to t
he anomalous magnetic moment of the muon\, among other calculations.\n\nht
tps://indico.cern.ch/event/764552/contributions/3420559/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3420559/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$N\\pi$ excited state contamination in nucleon 3-pt functions usin
g ChPT
DTSTART;VALUE=DATE-TIME:20190621T083000Z
DTEND;VALUE=DATE-TIME:20190621T085000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420525@indico.cern.ch
DESCRIPTION:Speakers: Oliver Baer (Humboldt University Berlin\, Germany)\n
The $N\\pi$ state contribution to nucleon 3-pt functions involving the pse
udoscalar density P(x) and the time component $A_{4}(x)$ of the axial vect
or current are computed to LO in ChPT. In case of the latter the $N\\pi$ c
ontribution is O($M_N$) enhanced compared to the single nucleon ground sta
te contribution. In addition\, a relative sign in two terms of the $N\\pi$
-state contribution leads an almost linear dependence on the operator inse
rtion time\, as it is observed in lattice data. In case of the pseudoscala
r density the $N\\pi$ contribution is strongly dependent on the momentum t
ransfer\, leading to a sizeable distortion of the pseudoscalar nucleon for
m factor. The role the $N\\pi$ excited states play in violating the PCAC f
orm factor relation is also discussed.\n\nhttps://indico.cern.ch/event/764
552/contributions/3420525/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420525/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The light baryon spectrum in the continuum limit
DTSTART;VALUE=DATE-TIME:20190620T062000Z
DTEND;VALUE=DATE-TIME:20190620T064000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420494@indico.cern.ch
DESCRIPTION:Speakers: Gunnar Bali (Universität Regensburg)\nWe present co
ntinuum limit results of the quark mass dependence of octet and decuplet b
aryon masses. These are obtained on large volumes\, employing three differ
ent trajectories in the quark mass plane\, including the physical point. T
he five different lattice spacings reach down to below 0.04 fm. This becam
e possible by introducing open boundary conditions in time at the smaller
lattice spacings\, thereby eliminating the freezing of the topological cha
rge. This is part of the CLS programme of simulating $N_f=2+1$ flavours of
non-perturbatively improved Wilson fermions. We also determine the scale
and low energy constants.\n\nhttps://indico.cern.ch/event/764552/contribut
ions/3420494/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3420494/
END:VEVENT
BEGIN:VEVENT
SUMMARY:First study of $N_f=2+1+1$ lattice QCD with physical domain-wall q
uarks
DTSTART;VALUE=DATE-TIME:20190620T064000Z
DTEND;VALUE=DATE-TIME:20190620T070000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420495@indico.cern.ch
DESCRIPTION:Speakers: Ting-Wai Chiu (National Taiwan Univ\, National Taiwa
n Normal Univ\, Academia Sinica)\nUsing a cluster of Nvidia DGX-1 (8*V100
interconnected by the NVLink)\, TWQCD Collaboration has generated the fir
st gauge ensemble of $N_f=2+1+1 $ lattice QCD with physical domain-wall qu
arks\, on the $ L^3 \\times T = 64^3 \\times 64 $ lattice with lattice spa
cing $a \\sim 0.064 $~fm ($ L > 4 $ fm\, and $ M_\\pi L > 3 $). The gauge
ensemble constitutes of ~200 gauge configurations\, resulting from ~1000 H
MC trajectories by sampling one configuration every 5 trajectories. The sa
lient features of the HMC simulation are: to perserve the chiral symmetry
to high precision\, and to sample all topological sectors ergodically. In
this talk\, I will outline the HMC simulation and the generation of the ga
uge ensemble. Moreover\, I will present the first physical results (e.g.\,
the mass spectra of charmed mesons and baryons) from this $N_f = 2+1+1 $
gauge ensemble with physical domain-wall quarks.\n\nhttps://indico.cern.ch
/event/764552/contributions/3420495/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3420495/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Walking\, the dilaton\, and complex CFT (II)
DTSTART;VALUE=DATE-TIME:20190620T064000Z
DTEND;VALUE=DATE-TIME:20190620T070000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428290@indico.cern.ch
DESCRIPTION:Speakers: chik him wong (University of Wuppertal)\nAfter devel
oping the full implementation of the Implicit Maximum Likelihood Method\,
we discuss new tests of the dilaton low-energy effective field theory in t
he near-conformal paradigm with emergent light scalars in the sextet and e
ight-flavor models.\n\nhttps://indico.cern.ch/event/764552/contributions/3
428290/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3428290/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice Analysis of SU(2) with 1 Adjoint Dirac Flavor
DTSTART;VALUE=DATE-TIME:20190621T081000Z
DTEND;VALUE=DATE-TIME:20190621T083000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428306@indico.cern.ch
DESCRIPTION:Speakers: Anthony Grebe (Massachusetts Institute of Technology
)\nIn some proposed condensed matter systems\, SU(2) with one massless adj
oint Dirac quark flavor emerges as an effective theory of the critical poi
nt. Condensed matter theorists Bi and Senthil have conjectured that a com
posite fermion composed of two quarks and an antiquark becomes massless an
d non-interacting as the quark mass goes to zero\, whereas the other parti
cles in the theory all have masses bounded away from zero. In contrast\,
a previous lattice study by Athenodorou et al. suggests that SU(2) with on
e adjoint Dirac flavor is a conformal theory\, so the entire spectrum beco
mes massless as the quark mass vanishes. A third possibility is that the
theory undergoes spontaneous symmetry breaking\, with a single Goldstone b
oson (the scalar diquark) and its antiparticle going light. Here\, we exp
and upon Athenodorou's investigation by including the composite fermion an
d a larger range of quark masses in order to determine which of these thre
e potential scenarios accurately describes the theory.\n\nhttps://indico.c
ern.ch/event/764552/contributions/3428306/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3428306/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Constructing a composite Higgs model with built-in large separatio
n of scales
DTSTART;VALUE=DATE-TIME:20190620T081000Z
DTEND;VALUE=DATE-TIME:20190620T083000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428286@indico.cern.ch
DESCRIPTION:Speakers: Oliver Witzel (University of Colorado Boulder)\nExpe
rimentally a light 125 GeV Higgs boson has been observed but so far no oth
er heavier resonances. Viable models to describe the Higgs boson as compos
ite particle require hence to exhibit a large separation of scales which e
.g. occurs in systems located near a conformal fixed point.\n\nFirst I pre
sent our nonperturbative gradient flow step-scaling calculation of the ren
ormalization group beta function for an SU(3) gauge theory with 10 massles
s\, fundamental flavors. The steps of our calculation are detailed and th
e quality of our set-up using stout-smeared Möbius domain wall fermions w
ith Symanzik gauge action combined with Zeuthen flow measurements is demon
strated. Taking advantage of our step-scaling results\, I will use the sam
e set-up to construct a mass-split composite Higgs model with large scale
separation\, show first results\, and demonstrate some of its features. Th
is work is part of the research program by the LSD collaboration.\n\nhttps
://indico.cern.ch/event/764552/contributions/3428286/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3428286/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Continuum limit of SU(3) N=1 supersymmetric Yang-Mills theory and
supersymmetric gauge theories on the lattice
DTSTART;VALUE=DATE-TIME:20190619T033000Z
DTEND;VALUE=DATE-TIME:20190619T035000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428291@indico.cern.ch
DESCRIPTION:Speakers: Georg Bergner (Theoretisch-Physikalisches Institut\,
Universit\\"at Jena)\nIn this presentation I will provide an overview of
our investigations of supersymmetric gauge theories. I summarize our final
results of SU(3) $\\mathcal{N}=1$ supersymmetric Yang-Mills theory that a
llow for the first time an extrapolation to the continuum limit. This resu
lt shows that the symmetry is recovered in the continuum limit. I will rev
iew our recent approaches towards a simulation of more general supersymmet
ric gauge theories. This includes the first tests of simulations with dyna
mical overlap fermions.\n\nhttps://indico.cern.ch/event/764552/contributio
ns/3428291/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3428291/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$\\mathcal{N}=1$ Supersymmetric SU(3) Gauge Theory with a Twist
DTSTART;VALUE=DATE-TIME:20190619T035000Z
DTEND;VALUE=DATE-TIME:20190619T041000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428295@indico.cern.ch
DESCRIPTION:Speakers: Marc Steinhauser (Friedrich Schiller University Jena
)\nWe investigate the pure gauge sector of Super-QCD\, i.e. Super-Yang-Mil
ls (SYM) theory\, with focus on the bound states. To improve chiral symmet
ry as well as supersymmetry at finite lattice spacing\, we use a deformed
SYM lattice action. It contains a twist term\, similar to the lattice form
ulation of twisted mass QCD. We present the status of our theoretical and
numerical investigation.\n\nhttps://indico.cern.ch/event/764552/contributi
ons/3428295/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3428295/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice study of the 2-flavor U(1) gauge Higgs model at topologica
l angle $\\theta=\\pi$
DTSTART;VALUE=DATE-TIME:20190621T083000Z
DTEND;VALUE=DATE-TIME:20190621T085000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428307@indico.cern.ch
DESCRIPTION:Speakers: Daniel Göschl (University of Graz)\nWe study the 2-
d $U(1)$ gauge Higgs model with 2 flavors on the lattice. We simulate at t
opological angle $\\theta=\\pi$ and overcome the sign problem with a world
line representation of the theory. Using a novel definition of the theta-t
erm\, in terms of a Villain-type action\, gives rise to a lattice discreti
zation of the topological charge as an integer and thus\, exactly implemen
ts the charge conjugation symmetry at $\\theta=\\pi$.\nWe introduce a new
coupling $g$ in the 2-flavor quartic self interaction that allows us to de
form the full $SU(2)$ flavor symmetry to $\\mathbb{Z}_2 \\times U(1)$. We
study the phase diagram of this system as a function of $g$ and the mass p
arameter and determine the critical lines as well as the order of the phas
e transitions using finite size scaling.\n\nhttps://indico.cern.ch/event/7
64552/contributions/3428307/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3428307/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Formulating Lattice Field Theory for a Quantum Computer
DTSTART;VALUE=DATE-TIME:20190619T014000Z
DTEND;VALUE=DATE-TIME:20190619T020000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428318@indico.cern.ch
DESCRIPTION:Speakers: Richard Brower (Boston University)\nThe quantum link
(or QCD abacus) Hamiltonian was introduced as a\nclassical algorithm repr
esenting both gauge and matter fields by\nsingle bit fermion operators in
an extra dimension. This formalism is\nrecast for quantum computing\, as
a Hamiltonian in Minkowski space for\nreal time Qubit simulations. The ad
vantages of pseudo-fermions\nto implement the Jordan Wigner transformation
and the Trotter\nexpansion in local gauge invariant local kernels is disc
ussed. For\nU(1) compact QED the kernels on a triangular lattice are defi
ned\nand a Qubit circuit implementation given to test on existing hardware
.\n\nhttps://indico.cern.ch/event/764552/contributions/3428318/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3428318/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sp(2N) Yang-Mills towards large N.
DTSTART;VALUE=DATE-TIME:20190621T064000Z
DTEND;VALUE=DATE-TIME:20190621T070000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428294@indico.cern.ch
DESCRIPTION:Speakers: Jack Holligan ()\nOwing to their importance for BSM
model building\, understanding the non-perturbative physics of Sp(2N) gaug
e theories is of high importance due to their large-N extrapolations. In t
his talk\, we examine the glueball spectrum of Yang-Mills theories based o
n symplectic groups. Glueball masses are calculated numerically with a var
iational method from Monte Carlo generated gauge configurations. After per
forming a continuum extrapolation for N=1\,2\,3 and 4\, we use the obtaine
d continuum limit to determine masses at large N. We compare the resulting
spectrum with that of SU(N) in the same limit.\n\nhttps://indico.cern.ch/
event/764552/contributions/3428294/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3428294/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Constraining EFTs in a Theory with Light Composite Scalars
DTSTART;VALUE=DATE-TIME:20190620T083000Z
DTEND;VALUE=DATE-TIME:20190620T085000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428288@indico.cern.ch
DESCRIPTION:Speakers: George Fleming (Yale University)\nThe Lattice Strong
Dynamics (LSD) collaboration has been studying SU(3) Yang-Mills with eigh
t light flavors of Dirac fermions. This theory has accumulating numerical
evidence for near conformal dynamics and a light composite isosinglet sca
lar meson. It could serve as a prototype of a composite Higgs sector if a
reliable low-energy Effective Field Theory (EFT) could be identified. Se
veral candidate EFTs have been proposed. I will summarize our efforts to
constrain these EFTs using computed observables\, including pion and scala
r masses\, decay constants and scattering lengths.\n\nhttps://indico.cern.
ch/event/764552/contributions/3428288/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3428288/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A study of thermal SU(3) supersymmetric Yang-Mills theory and near
-conformal theories from the gradient flow
DTSTART;VALUE=DATE-TIME:20190620T091000Z
DTEND;VALUE=DATE-TIME:20190620T093000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428296@indico.cern.ch
DESCRIPTION:Speakers: Camilo Lopez (Theoretisch-Physikalisches Institut\,
Universit\\"at Jena)\nIn recent years\, gradient flows of Yang-Mills and s
pinor fields have opened new possibilities in lattice simulations. I will
focus on two applications of this method. Firstly\, it has been shown that
flowed composite local operators\, like condensates and currents\, are re
normalised independently of the regularisation scheme. This facilitates th
e study of thermal phase transitions\, e.g. in supersymmetric theories. In
previous studies we had found that the restoration of the non-anomalous
chiral symmetry and the breaking of the centre symmetry occur simultaneous
ly in SU(2) supersymmetric Yang-Mills theory. I will show new results for
the gauge group SU(3). The gradient flow is also tightly related to renorm
alisation group transformations. This can be exploited to directly compute
the spectrum of operator dimensions in quantum field theories with an IR
conformal point. In this regard I will discuss the computation of the mass
anomalous dimension in near-conformal adjoint QCD with N${_f}=2$ and $\\f
rac{3}{2}$.\n\nhttps://indico.cern.ch/event/764552/contributions/3428296/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3428296/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Breaking the latency barrier: Strong scaling LQCD on GPUs
DTSTART;VALUE=DATE-TIME:20190618T074000Z
DTEND;VALUE=DATE-TIME:20190618T080000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428330@indico.cern.ch
DESCRIPTION:Speakers: Mathias Wagner (NVIDIA)\nThe ability to strong scale
is crucial for Lattice QCD simulations. Since the creation of the QUDA li
brary for Lattice QCD on NVIDIA GPUs\, this has always been a key developm
ent goal. Techniques like GPUDirect RDMA and NVLink allow for fast intra-n
ode and inter-node data transfer and QUDA makes extensive use of them. How
ever\, API overheads and necessary synchronizations between GPU and CPU ar
e increasingly limiting the ability to strong scale with MPI communication
. Fine-grained GPU-centric communication provides a way out as it complete
ly removes these bottlenecks by moving the communication to the GPU kernel
s. We will discuss the techniques that QUDA implements to achieve the best
scaling with MPI and novel improvements using NVSHMEM for GPU-centric com
munication. Finally\, we will show scaling results on x86 and POWER system
s.\n\nhttps://indico.cern.ch/event/764552/contributions/3428330/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3428330/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Neutron Electric Dipole Moments with Clover Fermions
DTSTART;VALUE=DATE-TIME:20190621T081000Z
DTEND;VALUE=DATE-TIME:20190621T083000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420544@indico.cern.ch
DESCRIPTION:Speakers: Boram Yoon (Los Alamos National Laboratory)\nNeutron
s can have nonvanishing electric dipole moment (EDM) when the theory has b
roken P and T symmetries. Since the CP violation (CPV) arising from the st
andard model (SM) is small or strongly suppressed at high temperature\, ne
w CPV from beyond the SM (BSM) is needed to explain the baryogenesis\, and
EDMs of elementary particles\, such as the neutron\, are good probes of s
uch BSM physics. In this talk\, we present results for contributions to th
e neutron EDM arising from the QCD theta-term\, the Weinberg three-gluon o
perator and the quark chromo-EDM from our ongoing lattice calculations usi
ng clover valence quarks on the MILC HISQ lattices. We use the Schwinger
source method to incorporate the chromo-EDM term in the proagaror and the
gradient-flow technique to smooth the gluonic operators.\n\nhttps://indico
.cern.ch/event/764552/contributions/3420544/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420544/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Structure and transitions of nucleon excitations via parity-expand
ed variational analysis
DTSTART;VALUE=DATE-TIME:20190621T085000Z
DTEND;VALUE=DATE-TIME:20190621T091000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420552@indico.cern.ch
DESCRIPTION:Speakers: Finn Stokes (Forschungszentrum Jülich GmbH)\nThe re
cently-introduced Parity Expanded Variational Analysis (PEVA) technique al
lows for the isolation of baryon eigenstates on the lattice at finite mome
ntum free from opposite-parity contamination. We find that this technique
introduces a statistically significant correction in extractions of the el
ectromagnetic form factors of the ground state nucleon.\n\nIt also allows
first extractions of the elastic and transition form factors of nucleon ex
citations on the lattice. We present the electromagnetic elastic form fact
ors and helicity amplitudes of two negative-parity excitations of the nucl
eon. These results provide valuable insight into the structure of these st
ates\, and allow for a connection to be made to quark-model states in this
energy region.\n\nhttps://indico.cern.ch/event/764552/contributions/34205
52/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420552/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards a holographic description of cosmology (I): Phase diagram
of 3d SU(N) matrix field theory
DTSTART;VALUE=DATE-TIME:20190619T010000Z
DTEND;VALUE=DATE-TIME:20190619T012000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428278@indico.cern.ch
DESCRIPTION:Speakers: Andreas Juettner ()\nThe holographic principle allow
s us to study the physics of the early universe in terms of three-dimensio
nal boundary quantum field theories. For instance\, the power spectrum of
the CMB at high multipoles has in this way been post-dicted successfully i
n terms of calculations for 2pt functions of the energy-momentum tensor (E
MT) in perturbation theory. The lower end of the power spectrum maps onto
dynamics non-perturbative in nature and are therefore best predicted by la
ttice simulations.\n\nHere we study massless SU(N) scalar matrix field the
ory on the lattice as a first candidate theory. We present a comprehensive
study of its critical properties in terms of a finite-size-scaling study
and its large-N scaling both numerically and analytically.\n\nIn a next st
ep we compute 2pt functions of the EMT in this theory which will allow us
to make first lattice-based predictions for the spectrum of the CMB at low
multipoles. Results for the EMT 2pt function and its renormalisation are
discussed in the talk by Joseph Lee.\n\nhttps://indico.cern.ch/event/76455
2/contributions/3428278/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3428278/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Hubbard model in the canonical formulation
DTSTART;VALUE=DATE-TIME:20190619T022000Z
DTEND;VALUE=DATE-TIME:20190619T024000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3425925@indico.cern.ch
DESCRIPTION:Speakers: Urs Wenger (University of Bern)\nWe formulate the ma
ny-body system of non-relativistic fermions (Hubbard model) in the canonic
al formulation using transfer matrices in fixed fermion number sectors. By
analytically integrating out the auxiliary Hubbard-Stratanovich field due
to the four-fermion interaction\, we express the system in terms of discr
ete\, local fermion occupation numbers which are the only remaining degree
s of freedom. We show the close relation to the fermion loop and the fermi
on bag formulation. Then we demonstrate and prove that in 1+1 dimension th
e fermion sign problem is absent. Finally\, we construct improved estimato
rs for fermionic correlation functions and for the chemical potential\, an
d present results for arbitrary densities\, spin-polarizations and mass-im
balances.\n\nhttps://indico.cern.ch/event/764552/contributions/3425925/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3425925/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Investigation of N=1 supersymmetric Yang-Mills theory
DTSTART;VALUE=DATE-TIME:20190619T031000Z
DTEND;VALUE=DATE-TIME:20190619T033000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428281@indico.cern.ch
DESCRIPTION:Speakers: Philipp Scior (Universität Bielefeld)\nWe summarize
the latest results from our numerical simulations of supersymmetric Yang-
Mills theory with two and three colors. For gauge group SU(2) we use an op
timized variational method with an extended operator basis to extract the
masses of groundstates and excited states in the scalar\, pseudoscalar and
spin 1/2 sector. The extrapolations to the chiral and continuum limits in
dicate the formation of supermultiplets for both ground and excited states
. Further\, due to the extended operator basis\, we are able to investigat
e the mixing content of the physical states. For gauge group SU(3) we have
extracted the ground state masses in the scalar\, pseudoscalar and spin 1
/2 channels. Using a combined extrapolation towards the chiral and continu
um limit\, we find the formation of a bound state supermultiplet\, too.\n\
nhttps://indico.cern.ch/event/764552/contributions/3428281/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3428281/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The nature of spontaneous and dynamical gauge symmetry breaking
DTSTART;VALUE=DATE-TIME:20190620T085000Z
DTEND;VALUE=DATE-TIME:20190620T091000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428275@indico.cern.ch
DESCRIPTION:Speakers: Jeff Greensite (San Francisco State University)\nThe
Elitzur theorem does not rule out the breaking of a global subgroup of a
gauge group in some gauge\, either spontaneously or dynamically. But it is
known that such breaking occurs at different couplings in different gauge
s\, and is not necessarily associated with a thermodynamic transition. In
this talk I will outline a gauge invariant distinction between the unbrok
en and Higgs regions of a gauge-Higgs theory\, based on the concept of cus
todial symmetry.\n\nhttps://indico.cern.ch/event/764552/contributions/3428
275/
LOCATION: Shimao 1A+1B
URL:https://indico.cern.ch/event/764552/contributions/3428275/
END:VEVENT
BEGIN:VEVENT
SUMMARY:chiral condensate and suscptiblity of SU(2) $n_f=8$ naive staggere
d system
DTSTART;VALUE=DATE-TIME:20190620T060000Z
DTEND;VALUE=DATE-TIME:20190620T062000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428280@indico.cern.ch
DESCRIPTION:Speakers: Issaku Kanamori (R-CCS\, RIKEN)\nSU(2) 8 fundamental
flavor system with naive staggered fermion has a phase transition or cros
sover at strong coupling\, which seems to be a bulk transition.\nBy using
chiral random matrix model we analyse the chiral condensate of this sytem.
\nWe also report the chiral susceptibility and its volume dependence near
the transition point.\n\nhttps://indico.cern.ch/event/764552/contributions
/3428280/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3428280/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The flavor dependence of $m_\\varrho / f_\\pi$
DTSTART;VALUE=DATE-TIME:20190620T072000Z
DTEND;VALUE=DATE-TIME:20190620T074000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428297@indico.cern.ch
DESCRIPTION:Speakers: Daniel Nogradi ()\nThe dimensionless ratio $m_\\varr
ho / f_\\pi$ is computed in the continuum and chiral limit for SU(3) gauge
theory coupled to $N_f = 2\,3\,4\,5\,6$ fundamental fermions. All systema
tics (finite volume\, finite fermion mass\, finite cut-off) are controlled
and the final results show no statistically significant $N_f$-dependence.
\n\nhttps://indico.cern.ch/event/764552/contributions/3428297/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3428297/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Topology of Trace Deformed Yang-Mills Theory
DTSTART;VALUE=DATE-TIME:20190621T062000Z
DTEND;VALUE=DATE-TIME:20190621T064000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428271@indico.cern.ch
DESCRIPTION:Speakers: Marco Cardinali (INFN - National Institute for Nucle
ar Physics)\nIn this work we study\, by means of Monte Carlo simulations\,
the\ntopological properties of Yang-Mills (YM) theory in presence of the\
ndouble trace deformation. The deformation consists of an extra piece\nadd
ed to the standard YM action\, which forbids the deconfinement phase\ntran
sition even at high temperature. We compute topological\nobservables (such
as the topological susceptibility and the first term\nof the theta expans
ion of the free energy) in the deformed theory and\nwe compare them with t
he known values of the undeformed one in order\nto check if the trace defo
rmation modifies such properties or not.\n\nhttps://indico.cern.ch/event/7
64552/contributions/3428271/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3428271/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Spectral Projectors Method for Staggered Fermions
DTSTART;VALUE=DATE-TIME:20190621T064000Z
DTEND;VALUE=DATE-TIME:20190621T070000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428272@indico.cern.ch
DESCRIPTION:Speakers: Claudio Bonanno (INFN - National Institute for Nucle
ar Physics)\nWe extend the spectral projectors method to staggered fermion
s. Applying the index theorem to the staggered Dirac operator it is possib
le to work out an expression for the topological susceptibility which depe
nds only on the orthogonal projectors on quasi zero-modes\, as it has alre
ady been done for Dirac-Wilson fermions.\nBesides\, we generalize this met
hod deriving analogous expressions for all higher-order coefficients in th
e $\\theta$-expansion of the vacuum energy.\n\nhttps://indico.cern.ch/even
t/764552/contributions/3428272/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3428272/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Does confinement imply CP invariance of the strong interactions?
DTSTART;VALUE=DATE-TIME:20190621T070000Z
DTEND;VALUE=DATE-TIME:20190621T072000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428273@indico.cern.ch
DESCRIPTION:Speakers: Gerrit Schierholz (DESY)\nUsing the gradient flow\,
the strong coupling constant alpha_s and the vacuum angle theta of the SU(
3) Yang-Mills theory are investigated in the infrared limit. It appears th
at theta tends to zero (mod 2 pi)\, thus restoring CP invariance\, while a
lpha_s shows power-law divergence\, which naturally leads to a linear conf
ining potential.\n\nhttps://indico.cern.ch/event/764552/contributions/3428
273/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3428273/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards a holographic description of cosmology (II): Renormalisati
on of the 3D SU(N) scalar energy-momentum tensor
DTSTART;VALUE=DATE-TIME:20190619T012000Z
DTEND;VALUE=DATE-TIME:20190619T014000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428279@indico.cern.ch
DESCRIPTION:Speakers: Joseph Lee (University of Edinburgh)\nIn holographic
cosmology\, cosmological observables are described in terms of correlator
s of a three-dimensional boundary quantum field theory. In this talk\, we
study the renormalisation of the energy-momentum tensor 2 point function f
or 3D massless $SU(N)$ scalar matrix field theory. We present a non-pertur
bative procedure to remove divergences resulting from the loss of translat
ional invariance on the lattice\, by imposing Ward identities. This will a
llow us to make non-perturbative predictions for the CMB power spectrum at
low multipoles\, assuming the holographic theory describing the very earl
y Universe is the 3D massless $SU(N)$ scalar matrix field theory.\n\nhttps
://indico.cern.ch/event/764552/contributions/3428279/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3428279/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Toward the spectrum of the SU(2) adjoint Higgs model
DTSTART;VALUE=DATE-TIME:20190619T014000Z
DTEND;VALUE=DATE-TIME:20190619T020000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428282@indico.cern.ch
DESCRIPTION:Speakers: Vincenzo Afferrante (University of Graz)\nHiggs part
icles in the adjoint representation of a non-Abelian gauge theory play an
important role in many scenarios beyond the standard model\, especially gr
and-unified theories\, partial compositeness models\, and (broken) supersy
mmetric theories. However\, recently new analytic results based on gauge-i
nvariant perturbation theory have arisen\, which require a reevaluation of
the observable\, physical spectrum of such theories.\n\nLattice methods a
re used to determine this spectrum\, and test the underlying predictions.
To this end\, an SU(2) gauge theory with a single adjoint Higgs is simulat
ed. In the Brout-Englert-Higgs phase it is predicted that this theory exh
ibits a massless\, composite and gauge-invariant vector state. This model
can then be a well defined way to obtain a low energy QED from a GUT that
comprehends it. \n\nIt is needed to find simulation points where the Brout
-Englert-Higgs effect is present. In these points the physical spectrum as
well as the properties of the elementary particles will be investigated i
n multiple channels. We have found preliminary results about the presence
of a massless vector bound state\, and also about the phase diagram of the
theory.\n\nhttps://indico.cern.ch/event/764552/contributions/3428282/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3428282/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Case studies of near-conformal and conformal beta-functions
DTSTART;VALUE=DATE-TIME:20190620T070000Z
DTEND;VALUE=DATE-TIME:20190620T072000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428303@indico.cern.ch
DESCRIPTION:Speakers: Kieran Holland ()\nWe give an update on our lattice
studies of the beta-function for near-conformal and conformal gauge theori
es. These include 10\, 12 and 13 flavors in the fundamental representation
\, and 2 flavors in the sextet representation of SU(3). We discuss the ove
rall trends and new developments.\n\nhttps://indico.cern.ch/event/764552/c
ontributions/3428303/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3428303/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice QCD codes on Taihu-Light Supercomputer
DTSTART;VALUE=DATE-TIME:20190618T064000Z
DTEND;VALUE=DATE-TIME:20190618T070000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428336@indico.cern.ch
DESCRIPTION:Speakers: Ming Gong ()\nWe present a preliminary code package
designed for Sunway infrastructure of Taihu-Light supercomputer. Meta-prog
ramming and genetic algorithm on a new designed virtual machine layer are
adopted to investigate the feasibility of a general automatic optimization
scheme.\n\nhttps://indico.cern.ch/event/764552/contributions/3428336/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3428336/
END:VEVENT
BEGIN:VEVENT
SUMMARY:SO(4) invariant Higgs-Yukawa model with reduced staggered fermions
DTSTART;VALUE=DATE-TIME:20190618T105000Z
DTEND;VALUE=DATE-TIME:20190618T110500Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428304@indico.cern.ch
DESCRIPTION:Speakers: simon catterall ()\nWe explore the phase structure o
f a four dimensional SO(4) invariant lattice Higgs-Yukawa model\ncomprisin
g four reduced staggered fermions interacting with a real scalar field. Th
e fermions belong\nto the fundamental representation of the symmetry group
while the three scalar field components\ntransform in the self-dual repre
sentation of SO(4). The model is a generalization of a four fermion\nsyste
m with the same symmetries that has received recent attention because of i
ts unusual phase\nstructure comprising massless and massive symmetric phas
es separated by a very narrow phase\nin which a small bilinear condensate
breaking SO(4) symmetry is present. The generalization\ndescribed in this
paper simply consists of the addition of a scalar kinetic term. We find a
region of\nthe enlarged phase diagram which shows no sign of a fermion con
densate or symmetry breaking but\nin which there is nevertheless evidence
of a diverging correlation length. Our results in this region\nare consist
ent with the presence of a single continuous phase transition separating t
he massless and\nmassive symmetric phases observed in the earlier work.\n\
nhttps://indico.cern.ch/event/764552/contributions/3428304/
LOCATION: Foyer
URL:https://indico.cern.ch/event/764552/contributions/3428304/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thermal phase structure of a supersymmetric matrix model
DTSTART;VALUE=DATE-TIME:20190618T105000Z
DTEND;VALUE=DATE-TIME:20190618T111000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428305@indico.cern.ch
DESCRIPTION:Speakers: David Schaich ()\nI will present lattice investigati
ons of the Berenstein--Maldacena--Nastase deformation of maximally supersy
mmetric Yang--Mills quantum mechanics\, focusing on its phase diagram in t
he plane of the temperature $T$ and deformation parameter $\\mu$. By cons
idering values of the dimensionless coupling $g = \\lambda / \\mu^3$ spann
ing more than two orders of magnitude\, we find results for the deconfinem
ent $T / \\mu$ that interpolate between the $g \\to 0$ perturbative predic
tion and recent large-$N$ dual supergravity calculations in the limit $g \
\to \\infty$. We analyze multiple lattice sizes up to $N_{\\tau} = 24$ an
d numbers of colors up to $N = 16$\, allowing initial checks of the large-
$N$ continuum limit.\n\nhttps://indico.cern.ch/event/764552/contributions/
3428305/
LOCATION: Foyer
URL:https://indico.cern.ch/event/764552/contributions/3428305/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Walking\, the dilaton\, and complex CFT (I)
DTSTART;VALUE=DATE-TIME:20190620T062000Z
DTEND;VALUE=DATE-TIME:20190620T064000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428300@indico.cern.ch
DESCRIPTION:Speakers: Julius Kuti ()\nWe compare the absence of the confor
mal fixed point in the near-conformal gauge theory paradigm with the alter
nate hypothesis where a complex conjugate pair of conformal fixed points d
rives the slow scale-dependence (walking) of the renormalized gauge coupli
ng. The complex conformal fixed points would control the scale-dependent a
nomalous dimensions and the EFT of Goldstone pions coupled to the emergent
light scalar\, perhaps the dilaton of scale symmetry breaking.\n\nhttps:/
/indico.cern.ch/event/764552/contributions/3428300/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3428300/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Resonance study of SU(2) model with 2 fundamental flavours of ferm
ions.Resonance study of SU(2) model with 2 fundamental flavours of fermion
s.
DTSTART;VALUE=DATE-TIME:20190621T060000Z
DTEND;VALUE=DATE-TIME:20190621T062000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428287@indico.cern.ch
DESCRIPTION:Speakers: Tadeusz Janowski ()\nComposite Higgs models are very
promising candidate models to address\nthe long-standing naturalness prob
lem in the Standard Model.\nAmong them\, the most minimal one is the SU(2)
with 2 flavours of\nfermions in the fundamental representation of the gau
ge group.\nAn important prediction in these models is the existence of res
onance\nspectrum in vector boson scattering. In this talk I will describe
our\nstudy of the lowest such resonance\, which is the equivalent of rho\n
resonance in QCD.\nI will describe the scan of the parameter space using t
he\nclover-improved Wilson fermions with Symanzik improved gauge action an
d\nthen show the first results for the mass and width of the rho resonance
\nin this model.\n\nhttps://indico.cern.ch/event/764552/contributions/3428
287/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3428287/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Meson spectrum of Sp(4) lattice gauge theory with two fundamental
Dirac fermions
DTSTART;VALUE=DATE-TIME:20190621T062000Z
DTEND;VALUE=DATE-TIME:20190621T064000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428283@indico.cern.ch
DESCRIPTION:Speakers: Jong-Wan Lee (Pusan National University)\nWe calcula
te the meson spectrum of Sp(4) lattice gauge theory coupled to two fundame
ntal flavors of dynamical Dirac fermions\, where we focus on the lowest (f
lavored) spin-0 and spin-1 states. Such theories are often considered in t
he phenomenological models of composite Higgs and self-interacting dark ma
tter. We carry out continuum extrapolations using four different values of
lattice couplings\, and fit the resulting masses and decay constants to e
ffective field theory. Our results are then compared with quenched ones an
d those of other similar gauge theories.\n\nhttps://indico.cern.ch/event/7
64552/contributions/3428283/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3428283/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards a composite Higgs and a partially composite top quark
DTSTART;VALUE=DATE-TIME:20190621T070000Z
DTEND;VALUE=DATE-TIME:20190621T072000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428299@indico.cern.ch
DESCRIPTION:Speakers: Benjamin Svetitsky (Tel Aviv University)\nWe have ca
lculated quantities of interest to a theory of compositeness. The lattice
model\, approximating the candidate theory\, is the SU(4) gauge theory co
upled to fermions in two color representations. For the composite Higgs\,
a current correlator gives one of the ingredients of the effective Higgs
potential. For the partially composite top quark\, we have hyperbaryon ma
trix elements that govern mixing of the fundamental quark with its heavy c
omposite partner. The matrix elements turn out to be so small that the th
eory is disfavored as a source of a realistic top mass.\n\nhttps://indico.
cern.ch/event/764552/contributions/3428299/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3428299/
END:VEVENT
BEGIN:VEVENT
SUMMARY:GPU inverters on ROCm
DTSTART;VALUE=DATE-TIME:20190618T070000Z
DTEND;VALUE=DATE-TIME:20190618T072000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428337@indico.cern.ch
DESCRIPTION:Speakers: Yujiang Bi (Institute of High Energy Physics\, Chine
se Academy of Sciences)\nThe open source ROCm platform for GPU computing p
rovides an uniform framework to support both the NVIDIA and AMD GPUs\, and
also the possibility to porting the CUDA code to the ROCm-compatible one.
We will present the porting progress on the Overlap fermion inverter (GWU
-code) based on thrust and also a general inverter package - QUDA.\n\nhttp
s://indico.cern.ch/event/764552/contributions/3428337/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3428337/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum Critical Phenomena in an O(4) Fermion Chain
DTSTART;VALUE=DATE-TIME:20190621T085000Z
DTEND;VALUE=DATE-TIME:20190621T091000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428308@indico.cern.ch
DESCRIPTION:Speakers: Hanqing Liu (Duke University)\nWe construct an inter
acting spin $\\frac{1}{2}$ fermion model with an $O(4)$ symmetry\, motivat
ed by the ability to study its physics using the meron cluster algorithm.
By adding a strong repulsive Hubbard interaction $U$\, we can transform it
into the regular Heisenberg anti-ferromagnet. While we can study our mode
l in any dimension\, as a first project we study it in one spatial dimensi
on. We discover that the model is massive and breaks a $\\mathbb{Z}_2$ tra
nslation symmetry at low temperatures when $U$ is small. Since at large va
lues of $U$ the model is equivalent to a spin-half anti-ferromagnetic chai
n which is massless for topological reasons\, our finding implies that our
model has a quantum phase transition from a massive $\\mathbb{Z}_2$ broke
n phase to a topologically massless phase as we increase $U$. The existenc
e of these two phases is consistent with the Lieb-Schultz-Mattis theorem a
nd our model allows us to study the phase transition between. We present r
esults obtained from our quantum Monte Carlo method near this phase transi
tion.\n\nhttps://indico.cern.ch/event/764552/contributions/3428308/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3428308/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Models of strong electroweak symmetry breaking.
DTSTART;VALUE=DATE-TIME:20190622T010000Z
DTEND;VALUE=DATE-TIME:20190622T014500Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428309@indico.cern.ch
DESCRIPTION:Speakers: Vincent Drach (Plymouth University)\nStrongly couple
d gauge theories can be used in various context to build models that addre
sses some of the issues of the Standard Model. After reviewing the variou
s scenarios of electroweak symmetry breaking models based on new strongly
interacting sector\, I will present the variety of challenges they offer
to the lattice community. I will then review the on-going lattice efforts
to explore the mechanisms at work and to provide reliable results relevant
for the phenomenology of new physics beyond the Standard Model.\n\nhttps:
//indico.cern.ch/event/764552/contributions/3428309/
LOCATION: Wuchang+Hankou
URL:https://indico.cern.ch/event/764552/contributions/3428309/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gauge-invariant path-integral measure for the overalp Weyl fermion
s in 16 of SO(10) and the SM
DTSTART;VALUE=DATE-TIME:20190621T072000Z
DTEND;VALUE=DATE-TIME:20190621T074000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428292@indico.cern.ch
DESCRIPTION:Speakers: Yoshio Kikukawa (the University of Tokyo)\nWe consid
er the lattice formulation of the SO(10) chiral gauge theory with left-han
ded Weyl fermions in the sixteen dimensional spinor representation (16)/th
e Standard Model in the framework of the Overlap fermion/the Ginsparg-Wils
on relation. We define a manifestly gauge-invariant path-integral measure
for the left-handed Weyl field using all the components of the Dirac field
\, but the right-handed part of which is just saturated completely by inse
rting a suitable product of the SO(10)-invariant 't Hooft vertices in term
s of the right-handed field. We also discuss the relations of our formulat
ion to other approaches/proposals to decouple the species-doubling/mirror
degrees of freedom. Those include Eichten-Preskill model\, Ginsparg-Wilson
Mirror-fermion model\, Domain wall fermion model with the boundary Eichte
n-Preskill term\, and 4D Topological Insulator/Superconductor with gapped
boundary phase. We clarify the similarity and the difference in technical
detail and show that our proposal is a well-defined and unified testing gr
ound for that basic question.\n\nhttps://indico.cern.ch/event/764552/contr
ibutions/3428292/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3428292/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Leadership-Class Multi-Grid Algorithms for HISQ Fermions on GPUs
DTSTART;VALUE=DATE-TIME:20190618T072000Z
DTEND;VALUE=DATE-TIME:20190618T074000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428316@indico.cern.ch
DESCRIPTION:Speakers: Evan Weinberg (NVIDIA Corporation)\nWith the latest
generation of leadership-class machines\, lattice QCD simulations are able
to probe multi-scale physics with unprecedented resolution. These advance
ments come with super-linear increases in the costs of modern simulations
due to the phenomena of critical slowing down. In the case of linear solve
rs for LQCD\, the only robust solution to this challenge is the developmen
t and efficient implementation of effective multi-grid algorithms. In this
talk we will discuss the latest developments for a multi-grid algorithm f
or both the naïve staggered and HISQ operator. We will present results fr
om an MG implementation in the highly optimized QUDA library applied to ul
tra-fine and physical point configurations from the MILC collaboration. We
will also discuss future steps towards integrating multi-grid into HISQ H
MC.\n\nhttps://indico.cern.ch/event/764552/contributions/3428316/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3428316/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hadrons: a Grid-powered workflow management system for lattice QCD
measurements
DTSTART;VALUE=DATE-TIME:20190619T010000Z
DTEND;VALUE=DATE-TIME:20190619T012000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428314@indico.cern.ch
DESCRIPTION:Speakers: Antonin Portelli (The University of Edinburgh)\nHadr
ons is a free C++ framework based on the high-performance Grid library to
implement lattice QCD measurement workflows. It is based on a modular data
flow programming approach to accommodate with the heterogeneity of lattice
measurements. The different measurement steps (inversions\, contractions\
, I/O …) are implemented as individual modules with inputs and outputs\,
and a measurement workflow forms a directed acyclic graph (DAG) of such m
odules. All the modules have access to a global environment for storing na
med objects. A global virtual machine takes care of scheduling the measure
ment\, while minimising the memory consumption of the workflow through an
optimisation of the module DAG and a garbage collection mechanism. Hadrons
can be driven through a C++ API or an XML description of the DAG\, more h
ybrid approaches can also be developed using the extensive serialisation f
eatures of Grid.\n\nhttps://indico.cern.ch/event/764552/contributions/3428
314/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3428314/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards higher order numerical stochastic perturbation computation
applied to the twisted Eguchi-Kawai model
DTSTART;VALUE=DATE-TIME:20190619T012000Z
DTEND;VALUE=DATE-TIME:20190619T014000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428313@indico.cern.ch
DESCRIPTION:Speakers: Ken-Ichi Ishikawa (Hiroshima University)\nWe have ev
aluated perturbation coefficients of Wilson loops up to $O(g^8)$ for the f
our-dimensional twisted Eguchi-Kawai model using the numerical stochastic
perturbation theory (NSPT) in arXiv:1902.09847. In this talk we present th
e progress report on the higher order calculation up to $O(g^{63})$\, for
which we apply the fast Fourier transformation (FFT) based convolution alg
orithm to the multiplication of polynomial matrices in the NSPT to achieve
higher order calculation.\n\nhttps://indico.cern.ch/event/764552/contribu
tions/3428313/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3428313/
END:VEVENT
BEGIN:VEVENT
SUMMARY:S-wave pi-pi I=0 and I=2 scattering at physical pion mass
DTSTART;VALUE=DATE-TIME:20190621T085000Z
DTEND;VALUE=DATE-TIME:20190621T091000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3421223@indico.cern.ch
DESCRIPTION:Speakers: Tianle Wang (Columbia University)\nThe pi-pi scatter
ing phase shifts for both the s-wave I=0 and I=2 channels are determined f
rom a lattice calculation performed on 741 gauge configurations obeying G-
parity boundary conditions with a physical pion mass. The phase shifts are
determined for both stationary and moving pi-pi systems\, at four differe
nt center of mass momenta. We implement three interpolating operators incl
uding a sigma operator. We use both correlated fitting and the generalized
eigenvalue treatment and compare these two methods. A detailed systematic
error analysis is included as well as a comparison with the prediction of
Roy's equation.\n\nhttps://indico.cern.ch/event/764552/contributions/3421
223/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3421223/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Accelerating topological transitions in the 2D Schwinger Model.
DTSTART;VALUE=DATE-TIME:20190620T072000Z
DTEND;VALUE=DATE-TIME:20190620T074000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428320@indico.cern.ch
DESCRIPTION:Speakers: Dean Howarth (Boston University)\nWe present a metho
d for accelerating topological transition in the 2D\nSchwinger model with
a compact U(1) gauge and Wilson fermions by \ncoupling the 2D lattice via
a 3rd dimension with open boundary\nconditions. The fermions live on the c
entral slice. This allows\ntopological charge to flow into the central sli
ce\, which maintains\nan integer valued winding. The resulting effective a
ction on the\ncentral slice is mapped to an effective 2D action of the can
onical\nSchwinger model. The rate of topological transition for that effec
tive\naction is significantly increased\, modifications to the short range
\naction are suppressed\, and the expected long behaviour is preserved.\nG
eneralisation to 4 dimensional theories with SU(N) gauge groups\nmay offe
r a solution to the HMC topological freeze-out observed in current\nlattic
e QCD simulations.\n\nhttps://indico.cern.ch/event/764552/contributions/34
28320/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3428320/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Disconnected Loop Subtraction Methods in Lattice QCD
DTSTART;VALUE=DATE-TIME:20190621T060000Z
DTEND;VALUE=DATE-TIME:20190621T062000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428321@indico.cern.ch
DESCRIPTION:Speakers: Travis Whyte (Baylor University)\nTo compute disconn
ected quark loop operators\, stochastic noise methods are generally used.
In order to strengthen the physical signal projected out from these noisy
methods\, various subtraction techniques may be employed. We use the GMRES
-DR and MINRES-DR algorithms to solve for the linear equations of the non
Hermitian Wilson and Hermitian Wilson matrices\, while simultaneously calc
ulating low lying eigenmodes. This deflation helps to increase the rate of
convergence of the linear equations as well as decreases noise introduced
via stochastic methods. We demonstrate a subtraction method that combines
deflation of the low lying eigenmodes of the Hermitian Wilson matrix and
polynomial approximations to produce an extremely powerful noise suppressi
on technique\, termed Hermitian Forced Polynomial Subtraction (HFPOLY). Th
e effectiveness of this algorithm is demonstrated on ensembles in the quen
ched approximation\, as well as with dynamical ensembles generated by the
MILC Collaboration\, where the HISQ action was employed. We observe strong
low eigenmode dominance of the Hermitian Wilson matrix at vanishing quark
mass in the variance of the vector and scalar operators in the quenched a
pproximation\, and similar reduction in the variance is observed using the
dynamical ensembles.\n\nhttps://indico.cern.ch/event/764552/contributions
/3428321/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3428321/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Machine Learning in Lattice QCD: Confinement/Deconfinement classif
ication in SU(2) and SU(3).
DTSTART;VALUE=DATE-TIME:20190621T070000Z
DTEND;VALUE=DATE-TIME:20190621T072000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428339@indico.cern.ch
DESCRIPTION:Speakers: Denis Boyda (Far Eastern Federal University)\nWe inv
estigate power of Machine Learning for Lattice QCD problems. We used three
set up. First\, we used bare configurations of gauge fields and trained M
L model to calculate Polyakov loop: trained at two betas it predicts corre
ct critical value. Second\, we used set of Wilson loops for classification
of phases: trained in SU(2) ML model gives some signal in SU(3). And thir
d\, with spacial distribution of some gauge invariant object we predict ph
ase transition in SU(3) with ML model trained in SU(2).\n\nhttps://indico.
cern.ch/event/764552/contributions/3428339/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3428339/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mistaken Identity: The Multi-State Labeling Problem
DTSTART;VALUE=DATE-TIME:20190618T103000Z
DTEND;VALUE=DATE-TIME:20190618T105000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428317@indico.cern.ch
DESCRIPTION:Speakers: Kimmy Cushman (Yale University)\nIn lattice gauge th
eory\, understanding contributions from excited states is imperative for a
chieving high precision calculations. A variety of methods are available t
o extract excited states\, such as fitting to multiple exponentials\, Pron
y’s method\, and Matrix Prony\, correlator matrices\, and generalized ei
genvalue problems. A generic problem faced by all these methods is that th
e resulting states tend to have overlapping error ellipses (e.g. jackknife
\, bootstrap\, cross-validation\, etc.) making identification of states am
biguous. The problem may be alleviated somewhat by expert guidance in oper
ator selection to minimize overlap for a few low-lying states\, but this d
efeats the overall design goal of an automated black-box method. Instead\,
we face the overlapping states labeling problem directly. For example\, u
sing the bootstrapping method\, resolving excited state energies and their
error bars requires finding the most probable set of state labels for eac
h bootstrap sample. We investigate several variants of expectation maximiz
ation clustering in attempt to find an efficient algorithm for bootstrap l
abeling and therefore state identification.\n\nhttps://indico.cern.ch/even
t/764552/contributions/3428317/
LOCATION: Foyer
URL:https://indico.cern.ch/event/764552/contributions/3428317/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Staggered Fermions using Grid
DTSTART;VALUE=DATE-TIME:20190618T115000Z
DTEND;VALUE=DATE-TIME:20190618T121000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428319@indico.cern.ch
DESCRIPTION:Speakers: Patrick Steinbrecher (Brookhaven National Laboratory
)\nI present an overview of the implementation of the HISQ RHMC using the
Grid framework and report performance of key kernels on recent CPU and GPU
architectures.\n\nhttps://indico.cern.ch/event/764552/contributions/34283
19/
LOCATION: Foyer
URL:https://indico.cern.ch/event/764552/contributions/3428319/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Flow-based generative models for MCMC in lattice field theory
DTSTART;VALUE=DATE-TIME:20190620T070000Z
DTEND;VALUE=DATE-TIME:20190620T072000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428322@indico.cern.ch
DESCRIPTION:Speakers: Gurtej Kanwar (MIT)\nMarkov Chain Monte Carlo (MCMC)
allows efficient estimation of observables in many lattice theories. Howe
ver\, as a critical point in parameter space is approached\, typical MCMC
algorithms suffer from critical slowing-down: autocorrelation lengths in t
he chain diverge for all observables\, demanding increasingly more computa
tional cost to achieve the same statistical power. In lattice QCD\, for ex
ample\, critical slowing-down presents a significant barrier to approachin
g the continuum and physical point. We present a new class of MCMC algorit
hms that allow systematic improvement of autocorrelation lengths by optimi
zing (training) a variational model. Specifically\, a machine-learned norm
alizing flow is used to propose lattice configurations according to an app
roximate distribution that is made exact by a Metropolis accept/reject ste
p. In this Markov chain\, autocorrelation time of all observables is equal
and we prove a bound on this autocorrelation according to a KL divergence
between the machine-learned and true distributions. In a $\\phi^4$ scalar
field theory\, we show observables produced by the proposed method agree
with standard results and show control over the autocorrelation time in re
gions of paramter space where standard MCMC methods suffer from critical s
lowing-down.\n\nhttps://indico.cern.ch/event/764552/contributions/3428322/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3428322/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Frequency-splitting estimators of single-propagator traces
DTSTART;VALUE=DATE-TIME:20190621T062000Z
DTEND;VALUE=DATE-TIME:20190621T064000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428327@indico.cern.ch
DESCRIPTION:Speakers: Tim Harris (Trinity College\, University of Dublin)\
nIn this talk I will discuss the recently introduced frequency-splitting e
stimators\nof quark-line disconnected diagrams in lattice QCD. The evaluat
ion of these diagrams is\nrequired for many phenomenologically interesting
observables\, but suffers from large statistical\nerrors due to the vacuu
m and the random-noise contributions to their variances. Multi-level integ
ration\nhas the potential to improve dramatically the precision of the com
putation of these observables once\nthe random noise due to auxiliary stoc
hastic fields is kept below the intrinsic gauge noise.\nAfter reviewing th
e theoretical analysis of the variances\, I will introduce a new family of
stochastic\nestimators of single-propagator traces built upon a frequency
splitting combined with a hopping expansion of\nthe quark propagator\, an
d test their efficiency in two-flavour QCD with pions as light as 190 MeV.
\nThe use of these estimators reduces the cost of computing single-trace p
ropagators by one to two orders of magnitude over standard estimators depe
nding on the fermion bilinear.\nAs a concrete application\, I will show th
e impact of these findings on the computation of\nthe hadronic vacuum pola
rization contribution to the muon anomalous magnetic moment.\n\nhttps://in
dico.cern.ch/event/764552/contributions/3428327/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3428327/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sparsening Algorithm for Multi-Body Correlation Functions
DTSTART;VALUE=DATE-TIME:20190621T064000Z
DTEND;VALUE=DATE-TIME:20190621T070000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428315@indico.cern.ch
DESCRIPTION:Speakers: David Murphy (Massachusetts Institute of Technology)
\nIn recent years multigrid algorithms have dramatically reduced the cost
of generating gauge field ensembles and quark propagators for lattice simu
lations including light quarks described by the Wilson and Wilson-clover f
ermion actions. As a result\, we have observed in recent calculations of n
uclear physics at the physical pion mass that assembling correlation funct
ions from quark propagators is an increasingly costly aspect of these calc
ulations. In this talk we will discuss a sparsening algorithm for building
correlation functions describing multi-body systems of nucleons. This alg
orithm works by first block averaging lattice quark propagators\, producin
g sparsened quark propagators defined on a coarsened lattice\, and then co
mputing correlation functions from these sparsened propagators at reduced
computational cost. We have explored this approach by analyzing the low en
ergy QCD spectrum\, including systems as large as $ ^{4}_{2} \\mathrm{He}
$\, on a single $ 32^{3} \\times 48 $ Wilson-clover lattice ensemble with
$ m_{\\pi} \\approx 800 $ MeV. We find that the ground state masses and bi
nding energies we extract are consistent between correlation functions con
structed from sparsened or full propagators. In addition\, while we observ
e small\, systematic biases in excited states for the sparsened correlatio
n functions\, we also find that these biases can be removed by computing a
n inexpensive correction term.\n\nhttps://indico.cern.ch/event/764552/cont
ributions/3428315/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3428315/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon Mass and Omega Mass with All-HISQ Fermions at the Physical
Point
DTSTART;VALUE=DATE-TIME:20190620T060000Z
DTEND;VALUE=DATE-TIME:20190620T062000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420488@indico.cern.ch
DESCRIPTION:Speakers: Yin Lin (University of Chicago)\nWe will present the
first ever determination of the nucleon spectrum using HISQ valence quark
s in combination with the (2+1+1) MILC-HISQ sea quarks ensembles at the ph
ysical point. We performed analyses with both Bayesian and GEVP methods to
demonstrate control over excited states\, and three lattice spacings\, $\
\sim$0.15fm\, $\\sim$0.12fm\, and $\\sim$0.09fm\, were used to extrapolate
to continuum. With the experience gained from the nucleon\, we will also
present preliminary results of $\\Omega$ baryon spectrum on the same set o
f ensembles\, explored as an alternative method of scale setting.\n\nhttps
://indico.cern.ch/event/764552/contributions/3420488/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3420488/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QUDA 1.0
DTSTART;VALUE=DATE-TIME:20190618T103000Z
DTEND;VALUE=DATE-TIME:20190618T105000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428325@indico.cern.ch
DESCRIPTION:Speakers: Kate Clark (NVIDIA)\nEleven years after its inceptio
n\, the QUDA library for Lattice QCD on NVIDIA GPUs has achieved a histori
c 1.0 release. In this span QUDA has evolved into an open-source framework
for full QCD simulations. The library has been fully re-written in a new
highly optimized C++11 framework\, superseding python-generated routines a
nd ushering in a new age of rapid algorithm prototyping and development. Q
UDA supports nearly all fermion discretizations\, features cutting-edge al
gorithms such as adaptive multigrid\, deflation\, and block Krylov-space m
ethods\, and contains native support for mixed precision and symmetry-insp
ired data compression. In preparation for the exascale era\, there is full
-featured support for communication-mitigating methods\, intra-node peer-t
o-peer support\, and inter-node GPUDirect MPI. On this poster we will exp
licate these features\, reinforced by performance results on state-of-the-
art hardware. We strongly encourage discussions about user requests and co
ntributions.\n\nhttps://indico.cern.ch/event/764552/contributions/3428325/
LOCATION: Foyer
URL:https://indico.cern.ch/event/764552/contributions/3428325/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Status of Riemann Manifold Hybrid Monte Carlo
DTSTART;VALUE=DATE-TIME:20190618T103000Z
DTEND;VALUE=DATE-TIME:20190618T105000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428324@indico.cern.ch
DESCRIPTION:Speakers: Chulwoo Jung (Brookhaven National Laboratory)\nWe re
port on the ongoing study of Riemann Manifold Hybrid Monte Carlo (RMHMC) f
or Lattice QCD. The effect of Fourier acceleration with RMHMC are studied\
non both quenched and 2+1-flavor dynamical ensembles by measuring autocorr
elations on topological charge and wilson flow scales\, as well as topolog
ical diffusion coefficients.\n\nhttps://indico.cern.ch/event/764552/contri
butions/3428324/
LOCATION: Foyer
URL:https://indico.cern.ch/event/764552/contributions/3428324/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QCD on the Modular Supercomputer
DTSTART;VALUE=DATE-TIME:20190618T062000Z
DTEND;VALUE=DATE-TIME:20190618T064000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428331@indico.cern.ch
DESCRIPTION:Speakers: Eric Brittain Gregory (University of Wuppertal/Jueli
ch Supercomputing Centre)\nI discuss motivations for generalizing QCD simu
lations for heterogeneous clusters\, and identify possible models of LQCD
simulations suitable for a modular supercomputing environment. The Jureca
cluster at the Juelich Supercomputing Centre\, with Haswell\, KNL\, and GP
U-enabled compute nodes\, serves as a test bed for modular supercomputing
strategies. I describe initial tests with the MILC code and Chroma\, with
minor alterations to the USQCD software stack.\n\nhttps://indico.cern.ch/e
vent/764552/contributions/3428331/
LOCATION: Shimao 3B
URL:https://indico.cern.ch/event/764552/contributions/3428331/
END:VEVENT
BEGIN:VEVENT
SUMMARY:2+1 Flavor Domain Wall Fermion QCD Lattices: Ensemble Production
and (some) Properties
DTSTART;VALUE=DATE-TIME:20190620T060000Z
DTEND;VALUE=DATE-TIME:20190620T062000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428333@indico.cern.ch
DESCRIPTION:Speakers: Robert Mawhinney (Columbia University)\nThe RBC and
UKQCD Collaborations continue to produce 2+1 flavor domain wall fermion en
sembles\, currently focusing on an ensemble with a $96^3 \\times 192$ volu
me on SUMMIT at ORNL with $1/a = 2.8$ GeV\, and smaller ensembles at stron
ger couplings. The $1/a = 2.8$ GeV ensemble uses the Exact One Flavor Alg
orithm for the strange quark\, along with the Multisplitting Preconditione
d Conjugate Gradient for solving the Dirac equation. We report on our pro
gress and experience with the $1/a = 2.8$ GeV ensemble\, along with result
s from studying the diffusion of topological charge on a variety of our co
arser ensembles.\n\nhttps://indico.cern.ch/event/764552/contributions/3428
333/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3428333/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Distance between configurations in MCMC simulations and the geomet
rical optimization of the tempering algorithms
DTSTART;VALUE=DATE-TIME:20190620T062000Z
DTEND;VALUE=DATE-TIME:20190620T064000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428329@indico.cern.ch
DESCRIPTION:Speakers: Nobuyuki Matsumoto (Kyoto University)\nIn papers [Fu
kuma\, Matsumoto\, Umeda\, arXiv:1705.06097\, arXiv:1806.10915]\, we defin
ed for a given Markov chain Monte Carlo (MCMC) algorithm a distance betwee
n two configurations that quantifies the difficulty of transition from one
configuration to the other configuration. In this talk\, we discuss its a
pplication to the optimization of parameters in various tempering algorith
ms. Examples include the standard simulated/parallel tempering algorithms
with respect to energy potentials\, and also the tempered Lefschetz thimbl
e method for the sign problem which uses the flow time as a tempering para
meter. This talk is based on a paper in preparation [Fukuma\, Matsumoto].\
n\nhttps://indico.cern.ch/event/764552/contributions/3428329/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3428329/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Improved algorithms for generalized thimble method
DTSTART;VALUE=DATE-TIME:20190620T064000Z
DTEND;VALUE=DATE-TIME:20190620T070000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428332@indico.cern.ch
DESCRIPTION:Speakers: Andrei Alexandru (The George Washington University)\
nQuestions about quantum field theories at non-zero chemical potential and
/or real-time correlators are often impossible to investigate numerically
due to the sign problem. A possible solution to this problem is to deform
the integration domain for the path integral in the complex plane. Samplin
g configurations on these manifolds is challenging. In this talk I will di
scuss some of these problems\, present solutions we have found and the dir
ections we are currently pursuing.\n\nhttps://indico.cern.ch/event/764552/
contributions/3428332/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3428332/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Classifying topological sector via machine learning
DTSTART;VALUE=DATE-TIME:20190621T072000Z
DTEND;VALUE=DATE-TIME:20190621T074000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428326@indico.cern.ch
DESCRIPTION:Speakers: Masakiyo Kitazawa (Osaka University)\nWe employ mach
ine learning techniques to estimate the topological charge $Q$ of gauge co
nfigurations in SU(3) Yang-Mills theory. As a first trial\, four-dimension
al convolutional neural networks are trained to estimate the topological
charge from the topological charge density on gauge configurations. The va
lue of $Q$ measured by the gradient flow is used for the definition of the
correct value. We\, however\, find that the neural network completely fai
ls in the classification in this approach.\n\nNext\, we feed the topologic
al charge density at nonzero but small flow times $t$ as inputs for the ne
ural network. Dimensional reduction is also performed as well as the four-
dimensional analysis. We find that\, by the combination of the topological
charge densities at $t/a^2\\le0.3$\, the trained neural network can estim
ate the correct value of $Q$ with more than $95\\%$ accuracy\, although th
e distribution of the $Q$ value at $t/a^2=0.3$ does not well converge to i
nteger values. This result suggests that the value of $Q$ obtained at larg
e gradient-flow time can be well estimated from the information obtained a
t small flow time\, and thus the numerical costs to estimate the value of
$Q$ in the gradient flow method can be substantially reduced with the aid
of the machine learning.\n\nIt is also found that the best accuracy is obt
ained when the dimension of the input is reduced to zero\, i.e. when the f
our-dimensinal integral of the topological charge density is used for inpu
ts of the neural network. This result shows that the neural network cannot
finds any useful feature from the spatial structure of the topological ch
arge density.\n\nThe dependences on lattice spacing\, spatial volume\, and
numerical costs for training will also be discussed.\n\nhttps://indico.ce
rn.ch/event/764552/contributions/3428326/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3428326/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quark confinement in the Yang-Mills theory with a gauge-invariant
gluon mass in view of the gauge-invariant BEH mechanism
DTSTART;VALUE=DATE-TIME:20190621T060000Z
DTEND;VALUE=DATE-TIME:20190621T062000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428270@indico.cern.ch
DESCRIPTION:Speakers: Akihiro Shibata (KEK)\nIn order to clarify the mecha
nism of quark confinement in the Yang-Mills theory with mass gap\, we prop
ose to investigate the massive Yang-Mills model\, namely\, Yang-Mills theo
ry with ``a gauge-invariant gluon mass term’’\, to be deduced from a s
pecific gauge-scalar model with a single radially-fixed scalar field under
a suitable constraint called the reduction condition. The gluon mass term
simulates the dynamically generated mass to be extracted in the low-energ
y effective theory of the Yang-Mills theory and plays the role of a new pr
obe to study the phase structure and confinement mechanism. \nIn this tal
k\, we first explain why such a gauge-scalar model is constructed without
breaking the gauge symmetry through the gauge-independent description of t
he Brout-Englert-Higgs mechanism which does not rely on the spontaneous br
eaking of gauge symmetry. Then we discuss how the numerical simulations f
or the proposed massive Yang-Mills theory can be performed by taking into
account the reduction condition in the complementary gauge-scalar model on
a lattice. Here we take care of the fact that massive Yang-Mills models
of distinct type are obtained depending on representations of the scalar f
ield. For the fundamental representation\, the massive Yang-Mills model is
expected to have a single confining phase with continuously connecting co
nfining and Higgs regions as suggested by the Fradkin-Shenker continuity.
For the adjoint representation\, the two regions will be separated by the
phase transition and become two different phases showing confinement and d
econfinement even at zero temperature. Moreover\, we point out that the
adjoint case would gives an alternative understanding for the physical mea
ning of the gauge-covariant decomposition for the Yang-Mills field known a
s the Cho-Duan-Ge-Faddeev-Niemi decomposition\, while the fundamental case
would give a novel decomposition which has been overlooked so far.\n\nhtt
ps://indico.cern.ch/event/764552/contributions/3428270/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3428270/
END:VEVENT
BEGIN:VEVENT
SUMMARY:How to extract the "Abelian" part of double-winding Wilson loop
DTSTART;VALUE=DATE-TIME:20190621T072000Z
DTEND;VALUE=DATE-TIME:20190621T074000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428274@indico.cern.ch
DESCRIPTION:Speakers: Ryutaro Matsudo (Chiba University)\nIt is known that
the naive Abelian Wilson loop defined by the Abelian projection cannot re
produce the correct behavior of the double-winding Wilson loop. It is also
known that the naive Abelian Wilson loop cannnot reproduce the correct be
havior of the Wilson loops in higher representations\, but this problem wa
s recently solved by using the redefiend "Abelian" Wilson loop.\nIn this t
alk\, we will give another reason why this redefined "Abelian" Wilson loop
behaves correctly\, and by following the same line of the argument\, we w
ill propose redefined "Abelian" double-winding Wilson loop which is consid
ered to behave correctly.\n\nhttps://indico.cern.ch/event/764552/contribut
ions/3428274/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3428274/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The path optimization for the sign problem of low dimensional QCD
DTSTART;VALUE=DATE-TIME:20190618T083000Z
DTEND;VALUE=DATE-TIME:20190618T085000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420431@indico.cern.ch
DESCRIPTION:Speakers: Yuto Mori (Kyoto University)\nThe path optimization
has been proposed to weaken the sign problem which appears in some field t
heories such as finite density QCD. In this method\, we optimize the integ
ral path in the complex plain to enhance the average phase factor. This me
thod has been applied to a one dimensional integral [1]\, finite density c
omplex scalar field [2]\, and the Polyakov loop extended Nambu-Jona-Lasini
o model with and without vector type interaction [3\, 4]. In these cases\,
the average phase factor is enhanced significantly. In this talk\, we dis
cuss the application of this method to low dimensional QCD as a first step
towards finite density QCD.\n\n[1] Y. Mori\, K. Kashiwa\, A. Ohnishi\, Ph
ys. Rev. D 96 (2017)\, 111501(R).\n[2] Y. Mori\, K. Kashiwa\, A. Ohnishi\,
PTEP 2018 (2018)\, 023B04.\n[3] K. Kashiwa\, Y. Mori\, A. Ohnishi\, Phys.
Rev. D 99\, no. 1\, 014033 (2019).\n[4] K. Kashiwa\, Y. Mori\, A. Ohnishi
\, arXiv:1903.03679 [hep-lat].\n\nhttps://indico.cern.ch/event/764552/cont
ributions/3420431/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420431/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Exploring the QCD phase diagram at finite density by the complex L
angevim method on a 16^3 x 32 lattice
DTSTART;VALUE=DATE-TIME:20190618T085000Z
DTEND;VALUE=DATE-TIME:20190618T091000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420424@indico.cern.ch
DESCRIPTION:Speakers: Shoichiro Tsutsui (RIKEN)\nWe explore the QCD phase
diagram at finite density with four-flavor staggered fermions using the co
mplex Langevin method (CLM)\, which is a promising approach to overcome th
e sign problem. In our previous work [arXiv:1811.12688] on an $8^3 \\times
16$ lattice at $\\beta=5.7$ with the quark mass $m=0.01$\, we have found
that the baryon number density has a clear plateau as a function of the ch
emical potential suggesting the formation of nuclear matter in a small box
. Here we use a $16^3 \\times 32$ lattice to reduce finite volume effects
and find that the plateau structure survives. Moreover\, the number of qua
rks in the plateau region turns out to be 24\, which is exactly the same a
s the one obtained previously on the $8^3 \\times 16$ lattice.\n\nhttps://
indico.cern.ch/event/764552/contributions/3420424/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420424/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Analytic continuation of Thermal Correlators
DTSTART;VALUE=DATE-TIME:20190619T010000Z
DTEND;VALUE=DATE-TIME:20190619T012000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420401@indico.cern.ch
DESCRIPTION:Speakers: Sourendu Gupta (TIFR)\nWe examine the analytic conti
nuation of long-distance correlation functions of composite operators at f
inite temperature from Euclidean to Minkowski. There are two definitions o
f mass in each regime\; in Euclidean these are the screening and pole mass
es. In a field theoretical model we show that the analytic continuation of
these mass parameters is non-trivial and requires short-distance informat
ion. This is in contrast to the situation at zero temperature.\n\nhttps://
indico.cern.ch/event/764552/contributions/3420401/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420401/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Spectral quantities in thermal QCD: a progress report from the FAS
TSUM collaboration
DTSTART;VALUE=DATE-TIME:20190619T014000Z
DTEND;VALUE=DATE-TIME:20190619T020000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420413@indico.cern.ch
DESCRIPTION:Speakers: Gert Aarts (Swansea University)\nIn order to study s
pectral quantities in thermal QCD\, the FASTSUM collaboration employs anis
otropic lattice simulations with Nf=2+1 flavours of Wilson fermions. Here
we discuss our Generation 2 and Generation 2L ensembles\, which differ in
the pion mass. We focus on observables related to the light quarks and chi
ral symmetry restoration. Moreover\, to prepare for the results to be disc
ussed in the next talk\, we examine the basics of mesonic correlation func
tions in QCD at small but nonzero baryon chemical potential using a Taylor
expansion\, including an analytical evaluation of the second-order term a
t very high temperature.\n\nhttps://indico.cern.ch/event/764552/contributi
ons/3420413/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420413/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards the spectrum of flavour-diagonal pseudoscalar mesons in QC
D+QED
DTSTART;VALUE=DATE-TIME:20190620T072000Z
DTEND;VALUE=DATE-TIME:20190620T074000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420507@indico.cern.ch
DESCRIPTION:Speakers: James Zanotti (University of Adelaide)\nThe low-lyin
g hadron spectrum has been of tremendous phenomenological significance in
resolving the nature of quark masses in strong interaction dynamics. In pa
rticular\, the pseudoscalar mesons provide the foundation of the framework
of chiral perturbation theory\, the low-energy effective theory of QCD. M
odern lattice calculations of pure QCD now provide excellent precision in
the resolution of quark masses. In order to match this theory onto the obs
erved mass scales of the standard model at sub-percent precision\, it is e
ssential to discriminate electromagnetic effects. When simulating the In t
his work\, we explore the spectrum of the flavour-diagonal pseudoscalar me
sons on dynamical QCD+QED lattices. To reduce the familiar statistical noi
se associated with annihilation diagrams we utilise exact colour and spin
dilution with a spatial interlacing for our $Z_2$ noise sources. In compar
ison with results from pure QCD\, we make first estimates of the contribut
ion of electromagnetic effects in the $\\pi_0$-$\\eta$ splitting.\n\nhttps
://indico.cern.ch/event/764552/contributions/3420507/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3420507/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Heavy four-quark and six-quark states from lattice QCD
DTSTART;VALUE=DATE-TIME:20190617T070000Z
DTEND;VALUE=DATE-TIME:20190617T072000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420486@indico.cern.ch
DESCRIPTION:Speakers: Nilmani Mathur ()\nWe present the results of a latti
ce calculation of four-quark states with quark contents $q_1q_2\\bar{Q}\\b
ar{Q}\, \\\, q_1\,q_2 \\subset u\,d\,s\,c$ and $Q \\equiv b\,c$ in both s
pin one ($J=1$) and spin zero ($J=0$) sectors. For the spin one states we
find that for both doubly heavy quarks and particularly for the doubly bot
tom quarks the ground state energy levels are below their respective thres
holds. The ground state spectra of the spin zero four-quark states with va
rious flavor combinations are seen to lie above their respective threshold
s. We also present the results of heavy dibaryons where we find the ground
state energy levels of a few six-quark combinations are below their respe
ctive thresholds. These calculations are performed on three dynamical $N_f
=2+1+1$ highly improved staggered quark ensembles at lattice spacings of a
bout 0.12\, 0.09 and 0.06 fm. We use the overlap action for light to charm
quarks while a non-relativistic action with non-perturbatively improved c
oefficients is employed for the bottom quark.\n\nhttps://indico.cern.ch/ev
ent/764552/contributions/3420486/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3420486/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Exploration of a singly-bottom tetraquark on 2+1 flavour lattices
DTSTART;VALUE=DATE-TIME:20190617T074000Z
DTEND;VALUE=DATE-TIME:20190617T080000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420502@indico.cern.ch
DESCRIPTION:Speakers: Brian Colquhoun (York University)\nThe likelihood th
at doubly-heavy tetraquarks will be strong-interaction stable is already s
uggested by features of heavy baryon phenomenology\, and confirmed by rece
nt lattice results. Phenomenological input in this case is possible becaus
e the light-quark configurations present in a putative tetraquark state ar
e also present in heavy baryons. There are\, however\, additional light-qu
ark configurations possible in the field of a heavy quark source that are
not accessible to ordinary heavy baryon or meson systems. Among these is t
he $ud\\bar{s}\\bar{b}$ channel. We present the results of our first inves
tigations of this channel\, including an investigation of whether it might
support a strong-interaction stable tetraquark state.\n\nhttps://indico.c
ern.ch/event/764552/contributions/3420502/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3420502/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon isovector couplings from 2+1 flavor lattice QCD at the phy
sical point
DTSTART;VALUE=DATE-TIME:20190620T072000Z
DTEND;VALUE=DATE-TIME:20190620T074000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420557@indico.cern.ch
DESCRIPTION:Speakers: NATSUKI TSUKAMOTO (Tohoku University)\nWe report the
recent progress on our study of the nucleon couplings including the axial
\, tensor and scalar couplings on a $(10.8\\rm fm)^4$ lattice using the PA
CS10 gauge configuration generated by the PACS Collaboration with the sto
ut-smeared $\\mathcal{O}(a)$ improved Wilson fermions and Iwasaki gauge ac
tion at $\\beta = 1.82$ corresponding to the lattice spacing of 0.084fm. W
e also estimated the renormalization constant in the RI/SMOM scheme which
stands for Regurization Independent Symmetric MOMentum-subtraction scheme.
Using the matching and evolution factors obtained from the perturbation t
heory\, we then evaluated the renormalized nucleon couplings in the $\\ove
rline{\\rm MS}$ scheme at the renormalizaion scale of 2 GeV.\n\nhttps://in
dico.cern.ch/event/764552/contributions/3420557/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420557/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Exclusive Channel Study of the Muon HVP
DTSTART;VALUE=DATE-TIME:20190617T093000Z
DTEND;VALUE=DATE-TIME:20190617T095000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420545@indico.cern.ch
DESCRIPTION:Speakers: Aaron Meyer (Brookhaven National Laboratory)\nThe Ha
dronic Vacuum Polarization (HVP) is a dominant contribution to the theoret
ical uncertainty of the muon anomalous magnetic moment. The uncertainty i
n lattice QCD calculations of the HVP are dominated by the long-distance c
ontribution to the vector correlation function. With explicit studies of
the exclusive channels of the HVP diagram\, it is possible to reconstruct
the long-distance behavior of the correlation function. This has the effe
ct of replacing the large statistical uncertainty of the correlation funct
ion with a significantly smaller uncertainty from the reconstruction. In
this talk\, I will present preliminary results of an exclusive study of th
e vector-vector correlation function using the distillation technique. Th
e computation is performed on 2+1 flavor Mobius Domain Wall Fermion ensemb
les with physical pion mass. Reconstruction of the long-distance correlat
ion function will enable lattice-only calculations of the HVP to achieve p
recision similar to estimates of the HVP from the R-ratio method on the ti
mescale of the new experimental measurements of the muon anomalous magneti
c moment.\n\nhttps://indico.cern.ch/event/764552/contributions/3420545/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420545/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Trace anomaly under lattice regularization
DTSTART;VALUE=DATE-TIME:20190620T081000Z
DTEND;VALUE=DATE-TIME:20190620T083000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420469@indico.cern.ch
DESCRIPTION:Speakers: Yi-Bo Yang (ITP/CAS\, China)\nThe trace anomaly is o
ne of the most non-trivial property of QCD which violates the scale invari
ance from the traceless QCD Energy momentum tensor\, and then give non-zer
o mass to nucleon in the chiral limit. It has been predicted by QCD for ov
er forty years\, and will be verified by the EIC/EicC experiments in the n
ear future.\n\nI will present several procedures and the related lattice c
alculation of the trace anomaly contribution to the hadron mass\, includin
g pion and nucleon.\n\nhttps://indico.cern.ch/event/764552/contributions/3
420469/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420469/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Determining the glue component of the nucleon
DTSTART;VALUE=DATE-TIME:20190620T083000Z
DTEND;VALUE=DATE-TIME:20190620T085000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420547@indico.cern.ch
DESCRIPTION:Speakers: Roger Horsley (University of Edinburgh)\nComputing t
he gluon component of momentum in the nucleon is a difficult and computati
onally expensive problem\, as the matrix element involves a quark-line-dis
connected gluon operator which suffers from ultra-violet fluctuations. But
also necessary for a successful determination is the non-perturbative ren
ormalisation of this operator. We investigate this renormalisation here by
using two methods: enforcing the energy-momentum sum rule and also by dir
ect computation in the RI mom scheme. A clear statistical signal is obtain
ed in the direct calculation by an adaption of the Feynman-Hellmann techni
que. In the case of quenched fermions good agreement is found between both
approaches.\n\nhttps://indico.cern.ch/event/764552/contributions/3420547/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420547/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bethe-Salpeter wavefunctions of hybrid charmonia
DTSTART;VALUE=DATE-TIME:20190620T081000Z
DTEND;VALUE=DATE-TIME:20190620T083000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420512@indico.cern.ch
DESCRIPTION:Speakers: Yunheng Ma (Institute of High Energy Physics)\nThe c
harmonium-like hybrid mesons with $J^{PC}=(0\,1\,2)^{-+}$ and $1^{--}$ are
investigated on anisotropic lattices in the quenched approximation. For t
hese states\, we construct spatially extended operators by splitting the $
\\bar{c}\\Gamma c B$-type operators into two parts ($c\\bar{c}$ and the ch
romo-magnetic field strength $B$) with different spatial distances $r$. In
the Coulomb gauge\, the matrix elements of these operators between the va
cuum and the corresponding states are interpreted as Bethe-Salpeter (BS) w
ave functions\, which can be extracted by fitting the correlation function
s at different $r$ simultaneously. After disentangling from the convention
al charmonium states in $0^{-+}$ \,$2^{-+}$ and $1^{--}$ channels，the sp
ectrum and the BS wave functions of the hybrid states in the four channels
are obtained. It is found that the ground state\, the first excited state
and even the second excited states of these channels are nearly degenerat
e in mass and have almost the same BS wave functions. Furthermore\, the BS
wave functions of the ground state\, the first excited state and the seco
nd excited state have zero radial node\, one radial node and two radial no
des\, respectively. In the non-relativistic picture\, this observation imp
lies that the hybrid states in these four channels have similar infrastruc
ture and the separation between the $c\\bar{c}$ component and gluonic comp
onent (depicted by $B$ operator) can be taken as a meaningful dynamical va
riable.\n\nhttps://indico.cern.ch/event/764552/contributions/3420512/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3420512/
END:VEVENT
BEGIN:VEVENT
SUMMARY:High precision determination of $w_0$
DTSTART;VALUE=DATE-TIME:20190620T083000Z
DTEND;VALUE=DATE-TIME:20190620T085000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420554@indico.cern.ch
DESCRIPTION:Speakers: Jana N. Guenther (University of Regensburg)\nTo perf
orm high precision calculations in lattice QCD for observables of physical
interest\, it is important to determine the lattice spacing with high ac
curacy. A convenient choice for scale setting is the observable $w_0$ whic
h is based on the Wilson flow. However the value of $w_0$ is not determin
ed experimentally and therefore the value of $w_0$ in physical units has t
o be be computed by lattice simulations before it can be used to set the s
cale in subsequent\ncalculations. We present a lattice calculation aiming
to determine $w_0$ with high precision. It takes QED effects beyond quench
ed approximations into account.\n\nhttps://indico.cern.ch/event/764552/con
tributions/3420554/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3420554/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Interglueball potential in SU(N) lattice gauge theory
DTSTART;VALUE=DATE-TIME:20190620T085000Z
DTEND;VALUE=DATE-TIME:20190620T091000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420480@indico.cern.ch
DESCRIPTION:Speakers: Nodoka Yamanaka (Riken)\nThe glueballs in the SU(N)
Yang-Mills theory are good candidates of dark matter.\nAn important featur
e to be discussed is the scattering between dark matter particles\, which
is constrained by observational data such as the galactic collisions.\nIn
this work\, we evaluate the interglueball potential in SU(2)\, SU(3)\, and
SU(4) lattice gauge theories using the HALQCD method and derive the glueb
all scattering cross section.\n\nhttps://indico.cern.ch/event/764552/contr
ibutions/3420480/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3420480/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Zb tetraquark channel and $B\\bar B^*$ interaction
DTSTART;VALUE=DATE-TIME:20190617T062000Z
DTEND;VALUE=DATE-TIME:20190617T064000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420479@indico.cern.ch
DESCRIPTION:Speakers: Sasa Prelovsek (University of Ljubljana\, Jozef Stef
an Institute\, University of Regensburg)\nBelle experiment discovered two
tetraquark candidates $Z_b(10610)$ and $Z_b(10650)$ with flavor structure
$\\bar bb\\bar du$ in 2011. We present the lattice study of the $\\bar bb
\\bar du$ system in the approximation of static $b$ quarks. The ground
and the excited eigenstates are extracted as a function of separation $r
$ between $b$ and $\\bar b$. The lower eigenstates at small $r$ are relat
ed to a bottomonium and a pion\, where the pion is at rest or in flight.
Some of the higher eigenstates are related to the $\\bar BB^*$ system. We
extract the interaction of the $\\bar BB^*$ system and present results con
cerning possible $Z_b$ resonances or bound states in this channel.\n\nhttp
s://indico.cern.ch/event/764552/contributions/3420479/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3420479/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lepton anomalous magnetic moments in Lattice QCD+QED
DTSTART;VALUE=DATE-TIME:20190617T091000Z
DTEND;VALUE=DATE-TIME:20190617T093000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420529@indico.cern.ch
DESCRIPTION:Speakers: Davide Giusti (Università degli Studi Roma Tre and
INFN Sezione di Roma Tre)\nWe present a lattice calculation of the Hadroni
c Vacuum Polarization (HVP) contributions to the anomalous magnetic moment
s of charged leptons $a_\\ell$ and an estimate of the contribution to $a_\
\mu^{\\rm HVP}$ not covered by the MUonE experiment\, including leading-or
der strong and electromagnetic isospin-breaking corrections from first pri
nciples. Our lattice results are obtained in the quenched-QED approximatio
n using the QCD gauge configurations generated by the European Twisted Mas
s Collaboration (ETMC) with $N_f=2+1+1$ dynamical quarks\, at three values
of the lattice spacing varying from 0.089 to 0.062 fm\, at several lattic
e volumes and with pion masses in the range $M_\\pi \\simeq 220 - 490~\\mb
ox{MeV}$.\n\nhttps://indico.cern.ch/event/764552/contributions/3420529/
LOCATION: Wuchang
URL:https://indico.cern.ch/event/764552/contributions/3420529/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Recent developments in LQCD studies on tetraquarks
DTSTART;VALUE=DATE-TIME:20190617T023000Z
DTEND;VALUE=DATE-TIME:20190617T030000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420504@indico.cern.ch
DESCRIPTION:Speakers: Anthony Sebastian Francis (CERN)\nHeavy flavor exoti
c hadrons\, and in particular tetraquarks\, continue to challenge our unde
rstanding and elude explanation from theory. In this contribution we discu
ss and review the progress and status in studying doubly heavy tetraquark
states with $J^P=1^+$ on the lattice. In particular\, we focus on our rece
nt efforts using 2+1 flavor lattice QCD with pion masses of 164\, 299 and
415 MeV at fixed lattice spacing and lattice volume\, L=32\, to study the
ground states of the flavor channels $ud\\bar b\\bar b$\, $\\ell s\\bar b\
\bar b$ as well as $ud\\bar c\\bar b$\, with $\\ell=u\,d$. In our work the
heavy quarks are handled using non-relativistic QCD for the bottom and th
e Tsukuba formulation of relativistic heavy quarks for the charm quarks. S
ignals for $ud\\bar b\\bar b$ and $\\ell s\\bar b\\bar b$ tetraquarks are
found with binding energies 189(10) and 98(7) MeV below the corresponding
free two-meson thresholds at the physical point. This indicates they can d
ecay only weakly. Further evidence for binding is found in the $ud\\bar c\
\bar b$ channel at the level of 15-61MeV\, close to the electromagnetic s
tability threshold. Studying the heavy quark mass dependence we find our r
esults closely follow a behaviour argued from phenomenological considerati
ons of the heavy baryon spectrum. First studies of the volume dependence o
f the determined energy spectrum show tentative hints confirming stability
for the $ud\\bar b\\bar b$\, $\\ell s\\bar b\\bar b$ as well as $ud\\bar
c\\bar b$ channels. Gathering and comparing recent results from the commun
ity where possible a consistent picture for doubly heavy tetraquarks is em
erging.\n\nhttps://indico.cern.ch/event/764552/contributions/3420504/
LOCATION: Wuchang + Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420504/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice QCD Impact on Determination of CKM Matrix: Status and Pros
pects
DTSTART;VALUE=DATE-TIME:20190617T033000Z
DTEND;VALUE=DATE-TIME:20190617T041500Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420573@indico.cern.ch
DESCRIPTION:Speakers: Steven Gottlieb (Indiana University)\nLattice QCD is
an important tool for theoretical input for flavor physics. There have b
een four reviews by the Flavour Lattice Averaging Group (FLAG). This talk
will review the current status of the magnitude of eight of the nine CKM
matrix elements\, borrowing heavily from the most recent FLAG review (co-a
uthored by the speaker). Future prospects for improving the determination
of the CKM matrix will be discussed.\n\nhttps://indico.cern.ch/event/7645
52/contributions/3420573/
LOCATION: Wuchang + Hankou Room
URL:https://indico.cern.ch/event/764552/contributions/3420573/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Recent progress on in-medium heavy flavor physics from lattice QCD
DTSTART;VALUE=DATE-TIME:20190618T014500Z
DTEND;VALUE=DATE-TIME:20190618T021500Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420429@indico.cern.ch
DESCRIPTION:Speakers: Hiroshi Ohno (Center for Computational Sciences\, Un
iversity of Tsukuba)\nHeavy quarks and heavy-flavor mesons are essential p
robes to investigate quark-gluon plasma produced in ultra-relativistic hea
vy ion collisions. On the other hand\, extracting spectral properties from
lattice heavy-flavor correlation functions to understand dissociation pat
terns of the bound states and heavy quark transport is a challenging subje
ct in lattice QCD. In this talk\, recent progress in lattice studies on in
-medium properties of heavy quarks as well as open and hidden heavy flavor
are reviewed and discussed. In particular\, different efforts of spectral
reconstruction from lattice correlation functions are highlighted and cor
responding results on dissociation of the heavy-flavor mesons and heavy qu
ark transport coefficients are addressed.\n\nhttps://indico.cern.ch/event/
764552/contributions/3420429/
LOCATION: Wuchang + Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420429/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$B \\to D^*$ form factors\, $R(D^*)$\, and $|V_{cb}|$
DTSTART;VALUE=DATE-TIME:20190618T021500Z
DTEND;VALUE=DATE-TIME:20190618T024500Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3421235@indico.cern.ch
DESCRIPTION:Speakers: Andrew Lytle (INFN Rome Tor Vergata)\nI will discuss
progress in lattice calculations of $B \\to D^* \\ell v$ form factors\, a
nd related decays involving a $b \\to c$ transition. These are important f
or the precision determination of $|V_{cb}|$ in the Standard Model (SM)\,
and a possible key to resolving long-standing discrepancy between inclusiv
e and exclusive determinations. I will also discuss their relevance for un
derstanding the SM anomalies in R-ratios\, $R(B \\to D^{(*)})$ and $R(B_c
\\to J/\\psi)$.\n\nhttps://indico.cern.ch/event/764552/contributions/34212
35/
LOCATION: Wuchang + Hankou
URL:https://indico.cern.ch/event/764552/contributions/3421235/
END:VEVENT
BEGIN:VEVENT
SUMMARY:China's effort on Supercomputing: progress and applications
DTSTART;VALUE=DATE-TIME:20190620T040000Z
DTEND;VALUE=DATE-TIME:20190620T043000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3432628@indico.cern.ch
DESCRIPTION:Speakers: Xiangfei Meng ()\nhttps://indico.cern.ch/event/76455
2/contributions/3432628/
LOCATION: Wuchang + Hankou
URL:https://indico.cern.ch/event/764552/contributions/3432628/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Delineating the properties of neutron star matter in cold\, dense
QCD
DTSTART;VALUE=DATE-TIME:20190622T021500Z
DTEND;VALUE=DATE-TIME:20190622T024500Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420449@indico.cern.ch
DESCRIPTION:Speakers: TORU KOJO (Central China Normal University)\nThe pro
perties of dense QCD matter are delineated through the construction of equ
ations of state which should be consistent with QCD calculations in the lo
w and high density limits\, nuclear laboratory experiments\, and the neutr
on star observations. These constraints\, together with the causality cond
ition of the sound velocity\, are used to develop the picture of hadron-qu
ark continuity in which hadronic matter continuously transforms into quark
matter (modulo small 1st order phase transitions).The resultant unified e
quation of state at zero temperature and beta-equilibrium\, which we call
Quark-Hadron-Crossover (QHC18 and QHC19)\, is consistent with the measured
properties of neutron stars and in addition gives us microscopic insights
into the properties of dense QCD matter. In particular to 10n0 the gluons
can remain as non-perturbative as in vacuum and the strangeness can be as
abundant as up- and down-quarks at the core of two-solar mass neutron sta
rs. Within our modeling the maximum mass is found less than 2.35 times sol
ar mass and the baryon density at the core ranges in 5-8n0.\n\nhttps://ind
ico.cern.ch/event/764552/contributions/3420449/
LOCATION: Wuchang+Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420449/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Prospects for large N gauge theories on the lattice
DTSTART;VALUE=DATE-TIME:20190622T014500Z
DTEND;VALUE=DATE-TIME:20190622T021500Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3425923@indico.cern.ch
DESCRIPTION:Speakers: Margarita Garcia-Perez (Instituto de Fisica Teorica
UAM-CSIC)\nI will review recent progress on addressing large N gauge theor
ies on the lattice. The focus will be put on the use of volume independenc
e as a tool to tackle otherwise unreachable large number of colours. Futur
e prospects and challenges for the study of large N QCD and various extens
ions will also be discussed.\n\nhttps://indico.cern.ch/event/764552/contri
butions/3425923/
LOCATION: Wuchang+Hankou
URL:https://indico.cern.ch/event/764552/contributions/3425923/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Computing Nucleon Electric Dipole Moment from lattice QCD
DTSTART;VALUE=DATE-TIME:20190620T014500Z
DTEND;VALUE=DATE-TIME:20190620T021500Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3432609@indico.cern.ch
DESCRIPTION:Speakers: Hiroshi Ohki ()\nHigh precision study of nuclear phy
sics is a vital part of searches for new physics beyond the standard model
. \nIn particular\, observation of permanent electric dipole moments (EDMs
) of nucleons (and nuclei) can be direct evidence for violation of CP symm
etry. Connecting the quark- and hadron-level effective interactions that i
nclude CP violating sources is an important task for lattice QCD.I will re
view recent progress on lattice calculations of nucleon EDM induced by low
est-order quark-gluon operators and chromo-electric interactions and their
implications for EDM experiments. I will also show preliminary results an
d discuss the issues and future prospects of the lattice calculations of
the nucleon EDM.\n\nhttps://indico.cern.ch/event/764552/contributions/3432
609/
LOCATION: Wuchang + Hankou
URL:https://indico.cern.ch/event/764552/contributions/3432609/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Physics Program and the Status of EicC
DTSTART;VALUE=DATE-TIME:20190618T041500Z
DTEND;VALUE=DATE-TIME:20190618T044500Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428335@indico.cern.ch
DESCRIPTION:Speakers: Yutie Liang (IMP\, CAS)\nElectron Ion Collider (EIC)
\, regarded as the ”super electron microscope”\, can provide the clear
est image inside of the nucleon. It is the most ideal tool to understand t
he internal structure of the nuclear matter\, especially the quark-gluon s
tructure of the nucleon and nuclei. Polarized EICs are the next generation
”multi-dimensional electron microscopes” that are most effective in s
tudying the deep structure and strong interactions of particles. Based on
the Heavy Ion High Intensity Accelerator Facility which is under construct
ion since the end of 2018 in Huizhou\, the IMP is proposing to build a hig
h luminosity polarized EIC facility in China\, named ”EicC”\, to carry
out the frontier research on nucleon structure studies. In this talk\, th
e current status of the EicC will be presented\, including the considerati
ons on detector design and the physics programs.\n\nhttps://indico.cern.ch
/event/764552/contributions/3428335/
LOCATION: Wuchang + Hankou
URL:https://indico.cern.ch/event/764552/contributions/3428335/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Heavy semileptonics with a fully relativistic mixed action
DTSTART;VALUE=DATE-TIME:20190618T095000Z
DTEND;VALUE=DATE-TIME:20190618T101000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3421236@indico.cern.ch
DESCRIPTION:Speakers: Julien Frison (Universidad Autonoma Madrid)\nThe fir
st phase of a heavy quark program based on twisted mass valence quarks has
been presented at last year's lattice conference. The CLS $N_f=2+1$ ensem
bles were used for their fine lattice spacing\, while twisting the masses
is expected to reduce discretisation errors even further and allow for a f
ully relativistic calculation. In this poster\, we present our first preli
minary results on three point functions\, corresponding to $D\\to K$ and $
D\\to\\pi$ semileptonic decays. We discuss our discretisation errors and t
he perspectives for the determination of $|V_{cs}|$ and $|V_{cd}|$\, as we
ll as for future uses of this framework for other semileptonic decays.\n\n
https://indico.cern.ch/event/764552/contributions/3421236/
LOCATION: Foyer
URL:https://indico.cern.ch/event/764552/contributions/3421236/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice QCD on a modern vector processor
DTSTART;VALUE=DATE-TIME:20190618T101000Z
DTEND;VALUE=DATE-TIME:20190618T103000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3421205@indico.cern.ch
DESCRIPTION:Speakers: Tilo Wettig (University of Regensburg)\nThe NEC SX-A
urora Tsubasa is a novel PCI-Express accelerator design available\nsince 2
018. The vector architecture supports vector lengths of 16\,384 bits and\
ndelivers up to 2.45 TFlop/s peak in double precision. It features outsta
nding\nmemory throughput of up to 1.2 TB/s. In this contribution we discu
ss\nkey aspects of the SX-Aurora Tsubasa\, comment on integrating the arch
itecture\ninto the Grid Lattice QCD framework\, and present initial benchm
arks.\n\nhttps://indico.cern.ch/event/764552/contributions/3421205/
LOCATION: Foyer
URL:https://indico.cern.ch/event/764552/contributions/3421205/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Proton decay matrix elements with physical quark masses
DTSTART;VALUE=DATE-TIME:20190618T095000Z
DTEND;VALUE=DATE-TIME:20190618T101000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428293@indico.cern.ch
DESCRIPTION:Speakers: Yasumichi Aoki (RIKEN)\nProton decay matrix elements
in QCD are indispensable quantities to constrain GUT models through the l
ower bound of the proton lifetime measured in the current and future under
ground experiments. Results obtained with lattice QCD so far have largest
systematic uncertainty on the chiral extrapolation. We report on the relev
ant form factors of the dominant decay processes: a proton to a pseudoscal
ar and an anti-lepton\, for every possible pseudoscalar state and three-qu
ark operator\, calculated on the physical-point\, improved Wilson-fermion
configurations generated by the PACS collaboration at the lattice spacing
of 0.084fm.\n\nhttps://indico.cern.ch/event/764552/contributions/3428293/
LOCATION: Foyer
URL:https://indico.cern.ch/event/764552/contributions/3428293/
END:VEVENT
BEGIN:VEVENT
SUMMARY:SU(3) gauge system with twelve fundamental flavors
DTSTART;VALUE=DATE-TIME:20190618T095000Z
DTEND;VALUE=DATE-TIME:20190618T101000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428285@indico.cern.ch
DESCRIPTION:Speakers: Anna Hasenfratz (university of colorado boulder)\nWe
establish the conformal nature of an SU(3) gauge theory with twelve\nfund
amental flavors by presenting final results for our gradient flow\nstep-sc
aling calculation of the renormalization group beta function using domain
wall fermions. The\ncontinuum limit of the $s=2$ step scaling function exh
ibits a sign change (infra-red\nfixed point) around $g_c^2 \\sim 5.5$ in t
he $c=0.25$ scheme. Our\ncalculation is based on a fully O(a^2) improved s
et-up with\nSymanzik gauge action\,\nstout-smeared Möbius domain wall fer
mions\, Zeuthen flow\, and Symanzik\noperator.\nThis setup has small cut-o
ff corrections which leads to reliable continuum extrapolations.\n\nIn add
ition we present a new analysis of the continuous $s\\to 0$ $\\beta$ func
tion using the same set of ensembles.\nThis new analysis uses only volumes
$L \\ge 24$ and determines the $\\beta$ function in a different renormali
zation scheme.\nThe continuous $\\beta$ function also predicts the existen
ce of a conformal fixed point.\n\nhttps://indico.cern.ch/event/764552/cont
ributions/3428285/
LOCATION: Foyer
URL:https://indico.cern.ch/event/764552/contributions/3428285/
END:VEVENT
BEGIN:VEVENT
SUMMARY:100 Years of Proton
DTSTART;VALUE=DATE-TIME:20190617T113000Z
DTEND;VALUE=DATE-TIME:20190617T123000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3434691@indico.cern.ch
DESCRIPTION:Speakers: xiangdong ji (university of maryland)\nProtons were
created shortly after the Universe began when the Quantum Chromodynamic (Q
CD) confinement forces went to effect. As a constituent of all atomic nucl
ei\, they were first discovered by Rutherford in 1919. For the last 100 ye
ars\, experimental and theoretical explorations of the proton structure ha
ve led to many important discoveries\, some of which are reviewed in this
talk. As of today\, however\, we are still grappling with an accurate desc
ription of the proton’s fundamental properties\, such as its mass and sp
in. Exa-scale computing plus a new generation of experiments may provide t
he final answer to the question “how does the Nature build the proton?
”\n\nhttps://indico.cern.ch/event/764552/contributions/3434691/
LOCATION: Science Hall\, Central China Normal University
URL:https://indico.cern.ch/event/764552/contributions/3434691/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A Calculation of Higher Order Taylor Expansion Coefficients
DTSTART;VALUE=DATE-TIME:20190618T105000Z
DTEND;VALUE=DATE-TIME:20190618T111000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420416@indico.cern.ch
DESCRIPTION:Speakers: Lorenzo Dini (Bielefeld University)\nThe long term g
oal of our current project is to provide a high-order Taylor expansion of
the grand canonical partition function of QCD\, at non vanishing chemical
potential. \nFor our study we use (2+1)-flavor of highly improved staggere
d quarks\n(HISQ) with physical light and strange quark masses. \nIn order
to achieve that goal\, we are further advancing the numerical\ntools that
allow for the calculation of up to tenth-order Taylor-expansion coefficien
ts: in particular\, we are improving the current measurement and sampling
strategies. \nConcerning the measurement\, we are developing a way to appl
y deflation as variance reduction tool to the operators that appear in the
coefficients of the expansion of the pressure. In particular\, we are foc
using on the quark number density operator ($D_1$)\, that is the main buil
ding block in the calculation of the expansion coefficients in the linear-
$\\mu$ framework. The spectrum of this operator is complex so\, in order
to evaluate a sufficient number of eigenvalues and eigenvectors to apply t
he deflation method\, we are currently implementing an eigensolver algorit
hm for non-hermitian operators. Through this algorithm we want to calculat
e the smallest eigenvalues of $D_1^{-1}$\, that correspond to the largest
of $D_1$. Increasing the order of the coefficients\, the smallest eigenval
ues of $D_1$ will become more and more negligible\, so once we have a suff
icient number of large eigenvalues of the quark number density we will abl
e to estimate coefficients to arbitrary order\, at least in principle. \nW
e also discuss the calculation of unbiased estimators for higher\nmoments
of the trace of the quark-density operator.\n\nhttps://indico.cern.ch/even
t/764552/contributions/3420416/
LOCATION: Foyer
URL:https://indico.cern.ch/event/764552/contributions/3420416/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chiral Ward identities for Dirac eigenmodes with staggered fermion
s
DTSTART;VALUE=DATE-TIME:20190618T112500Z
DTEND;VALUE=DATE-TIME:20190618T114500Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420470@indico.cern.ch
DESCRIPTION:Speakers: Hwancheol Jeong (Seoul National University)\nThere a
re several ways of distinguishing would-be zero modes of staggered fermion
s from non-zero modes of them. An intuitive approach is observing the tast
e symmetry on eigenvalue spectrum\, but this fails in many cases and does
not give much physical information.We are also able to identify those zero
modes by measuring their chiralities\, which has a better resolution for
the identification and provides physical information such as the topologic
al charge. We present results of the chirality measurement on quenched lat
tice ensembles using HYP-improved staggered fermions. In addition\, we int
roduce chiral Ward identities derived from the conserved U(1) axial symmet
ry. We show that leakages of the chiralities indeed satisfy these Ward ide
ntities numerically. We also investigate the leakage pattern between symme
tric pairs for the taste symmetry.\n\nhttps://indico.cern.ch/event/764552/
contributions/3420470/
LOCATION: Foyer
URL:https://indico.cern.ch/event/764552/contributions/3420470/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Full $\\mathcal{O}(a)$ improvement in EQCD
DTSTART;VALUE=DATE-TIME:20190618T111000Z
DTEND;VALUE=DATE-TIME:20190618T113000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420435@indico.cern.ch
DESCRIPTION:Speakers: Niels Schlusser (TU Darmstadt)\nEQCD is a 3D bosonic
theory containing SU(3) and an adjoint scalar\,\n which efficiently desc
ribes the infrared\, nonperturbative sector of\n hot QCD and which is hig
hly amenable to lattice study. We improve\n the matching between lattice
and continuum EQCD by determining the\n final unknown coefficient in the
$\\mathcal{O}(a)$ matching\, an additive\n scalar mass renormalization.
We do this numerically by using the\n symmetry-breaking phase transition
point of the theory as a line of\n constant physics. This prepares the
ground for a precision study of\n the transverse momentum diffusion coeff
icient $C(q_\\perp)$ within\n this theory. As a byproduct\, we provide a
n \n updated version of the EQCD phase diagram.\n\nhttps://indico.cern.ch
/event/764552/contributions/3420435/
LOCATION: Foyer
URL:https://indico.cern.ch/event/764552/contributions/3420435/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Semileptonic form factors for exclusive Bs -> K l nu and Bs -> Ds
l nu decays
DTSTART;VALUE=DATE-TIME:20190618T101000Z
DTEND;VALUE=DATE-TIME:20190618T103000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3421219@indico.cern.ch
DESCRIPTION:Speakers: Oliver Witzel (University of Colorado Boulder)\nWe p
resent our nonperturbative Lattice QCD calculation to determine semilepton
ic form factors for exclusive $B_s \\to K \\ell \\nu$ and $B_s \\to D_s \\
ell \\nu$ decays. Our calculation is based on RBC-UKQCD's set of 2+1 dynam
ical flavor gauge field ensembles and in the valence sector we use domain
wall fermions for up/down\, strange\, and charm quarks\, whereas bottom qu
arks are simulated with the relativistic heavy quark action. The continuum
limit is based on three lattice spacings and form factors over the full $
q^2$ range are shown.\n\nThese form factors are the basis to predict ratio
s studying lepton flavor universality or\, when combined with experimental
results\, to obtain CKM matrix elements $|V_{cb}|$ and $|V_{ub}|$. Due to
different experimental and theoretical set-ups\, these alternative $b$-de
cay channels may also help to shed light on the tension between the analys
is of inclusive and exclusive decays or may further serve as proxy for cor
responding $B$ decays.\n\nhttps://indico.cern.ch/event/764552/contribution
s/3421219/
LOCATION: Foyer
URL:https://indico.cern.ch/event/764552/contributions/3421219/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Laplace Operator On Discretized 3 Sphere's
DTSTART;VALUE=DATE-TIME:20190618T111000Z
DTEND;VALUE=DATE-TIME:20190618T113000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3425948@indico.cern.ch
DESCRIPTION:Speakers: Daniel Berkowitz (Yale University)\n"Applying lattic
e field theory to curved Riemannian manifolds opens up the doors to invest
igating some highly interesting physical systems\, including the cylindric
al manifolds of radial quantization $R$ $\\times$ $S^{D-1}$. Substantial
effort has already produced results on $R$ $\\times$ $S^2$ and we would l
ike to take a step towards higher dimensions. We tessellate the tetrahedra
l cells of the 600-cell using a tetrahedral-octahedral honeycomb lattice
projected onto the surface of the 3-sphere and compute the spectrum of its
laplacian using the methods of discrete exterior calculus."\n\nhttps://in
dico.cern.ch/event/764552/contributions/3425948/
LOCATION: Foyer
URL:https://indico.cern.ch/event/764552/contributions/3425948/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Flux tube with dynamical fermions from high temperature SU(3) latt
ice gauge theory
DTSTART;VALUE=DATE-TIME:20190618T113000Z
DTEND;VALUE=DATE-TIME:20190618T115000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420428@indico.cern.ch
DESCRIPTION:Speakers: Sodbileg Chagdaa (Theoretical Physics Department\, I
nstitute of Physics and Technology\, Mongolian Academy of Sciences)\nWe ex
plore the profiles of the flux tube connecting a quark and an antiquark in
high temperature SU(3) lattice gauge theory in close vicinity to the crit
ical temperature of the phase transition. In this work\, we consider the m
ore realistic case of the flux tube with dynamical quarks\, extending the
previous study to SU(3) gauge group and making use of the Gradient flow me
thod in smoothing procedure for noise reduction. The profiles of the chrom
oelectric and chromomagnetic field strengths in the flux tube have been me
asured from Polyakov loop-plaquette correlations using the highly improved
staggered quark (HISQ) action on lattice with temporal extent $N_{\\tau}=
8$. We present preliminary results for distances up to $2.5$ fm and temper
atures up to $1.13 T_c$.\n\nhttps://indico.cern.ch/event/764552/contributi
ons/3420428/
LOCATION: Foyer
URL:https://indico.cern.ch/event/764552/contributions/3420428/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Recent progress of two-baryon problem and ΩΩ interaction on the
lattice
DTSTART;VALUE=DATE-TIME:20190621T031500Z
DTEND;VALUE=DATE-TIME:20190621T034500Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420509@indico.cern.ch
DESCRIPTION:Speakers: Shinya Gongyo (Nishina Center\, RIKEN)\nI will prese
nt recent progress of baryon-baryon interaction from lattice QCD. So far\,
there are two methods to study the interaction: The direct method based o
n Luscher's finite volume formula which extracts eigen energies from the p
lateaux of the temporal correlation functions and the HAL QCD method which
extracts observables from the non-local potential associated with the tem
po-spatial correlation function. Despite that the two methods should give
the same results theoretically\, qualitative difference for observables ha
s been reported numerically. In the first part of my talk\, I will clarify
the origin of this discrepancy and discuss the validity of both methods.
In the second part of my\ntalk\, I will discuss ΩΩ interaction in the 1S
0 channel from lattice QCD using a large volume 8.1fm\, and nearly physica
l pion mass m_pi~146 MeV. The interaction is qualitatively similar to the
central potential of the nucleon-nucleon interaction\, i.e.\, the short ra
nge repulsion and the intermediate range attraction. I will show that the
attraction leads to the most strange dibaryon\, di-Omega\, which is locate
d near the unitary limit.\n\nhttps://indico.cern.ch/event/764552/contribut
ions/3420509/
LOCATION: Wuchang+Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420509/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Three particles on the lattice
DTSTART;VALUE=DATE-TIME:20190621T034500Z
DTEND;VALUE=DATE-TIME:20190621T041500Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420508@indico.cern.ch
DESCRIPTION:Speakers: Akaki Rusetsky (HISKP\, University of Bonn)\nIn rece
nt years\, the finite-volume Lüscher formalism has become a well-establis
hed\ntool to study the two-body scattering processes on the lattice. The f
ormalism has been\ngeneralized to the case of the coupled two-body channel
s and has been successfully\napplied for the analysis of the lattice data
for different scattering processes. A closely\nrelated method\, known unde
r the name of the Lellouch-Lüscher approach\, is being used\nfor the extr
action of the decay matrix elements with the two-body final states.\n\nIn
difference to this\, the progress in the study of the systems with three a
nd more particles\non the lattice lies behind\, albeit a number of importa
nt results have been obtained lately.\nIn my talk\, I plan to review the b
asic ideas\, which provide basis for the extraction of\nthe physical obser
vables\, defined in the infinite volume\, from the finite-volume lattice\n
spectra. Various approaches to this problem will be considered and compare
d. In\nparticular\, the three-body quantization condition will be discusse
d in detail. Perturbative\nexpansion of the energy levels will be performe
d\, and the optimal strategies for the analysis\nof data will be worked ou
t. As an illustration\, the recent lattice results in the three-body\nsect
or will be presented. In conclusion\, the perspectives of the further deve
lopment in the\nfield will be briefly discussed.\n\nhttps://indico.cern.ch
/event/764552/contributions/3420508/
LOCATION: Wuchang+Hankou
URL:https://indico.cern.ch/event/764552/contributions/3420508/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cluster-size scaling in O(N) non-linear sigma models
DTSTART;VALUE=DATE-TIME:20190618T083000Z
DTEND;VALUE=DATE-TIME:20190618T085000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3432105@indico.cern.ch
DESCRIPTION:Speakers: Wolfgang Bietenholz (UNAM\, Mexico)\nIn O(N) models\
, the multi-cluster algorithm generates spins\nclusters\, which are usuall
y considered as purely algorithmic\nobjects. We show that the histograms o
f their sizes scale\ntowards a continuum limit\, with a fractal dimension
D\, which\nsuggests that these clusters do have a physical meaning.\nWe de
monstrate this property for the quantum rotor in separate\ntopological sec
tors (where D=1)\, for the 2d XY model in the\nmassive and in the massless
phase (where D\n\nhttps://indico.cern.ch/event/764552/contributions/34321
05/
LOCATION: Shimao 1A+1B
URL:https://indico.cern.ch/event/764552/contributions/3432105/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice study on the twisted CP^{N-1} models on R x S^1
DTSTART;VALUE=DATE-TIME:20190618T093000Z
DTEND;VALUE=DATE-TIME:20190618T095000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3425908@indico.cern.ch
DESCRIPTION:Speakers: TATSUHIRO MISUMI (Akita University)\nWe here focus o
n CP^{N-1} models on R x S^1 with the Z_N twisted boundary conditions\, wh
ose importance has recently been increasing in terms of resurgence theory\
, volume independence and its relation to 4D gauge theory. We have perform
ed lattice simulations for the models with N=3-20 on several lattice sizes
(e.g. 40 x 8\, 200 x 8\, 400 x 12)\, with emphasis on Polyakov loop\, Cas
imir energy and fractional instantons. In the talk\, we will show our resu
lts on phase transition associated with the expectation value of Polyakov
loop and Casimir energy associated with the vacuum energy. We will also di
scuss the existence of Q=1/N fractional instantons and bions\, which play
a pivotal role in the resurgent structure and the volume independence of t
he models.\n\nhttps://indico.cern.ch/event/764552/contributions/3425908/
LOCATION: Shimao 1A+1B
URL:https://indico.cern.ch/event/764552/contributions/3425908/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Merons as the Relevant Topological Charge Carriers in the 2-d O(3)
Model
DTSTART;VALUE=DATE-TIME:20190618T085000Z
DTEND;VALUE=DATE-TIME:20190618T091000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3432095@indico.cern.ch
DESCRIPTION:Speakers: Joao C. Pinto Barros (AEC\, Institute for Theoretica
l Physics\, University of Bern)\nThe $2-d$ $O\\left(3\\right)$ model share
s many features with $4-d$ non-Abelian gauge theories\, including asymptot
ic freedom\, a nonperturbatively generated mass gap and a nontrivial topol
ogical charge $Q$. By an analytic rewriting of the partition function\, we
identify merons (a particular type of Wolff clusters with $Q=\\pm1/2$) as
the relevant topological charge carriers. \nIn contrast to semiclassical
instantons\, merons are uniquely identified in the fully nonperturbative f
unctional integral. While instantons are smooth $2-d$ objects\, merons are
physical objects with a fractal dimension $D=1.88(1)$\, which also exist
in the continuum limit. This result follows from the observed scaling of t
he meron cluster-size distribution. Consistently\, the merons of different
size exhibit the same fractal dimension. Small merons give rise to a loga
rithmic divergence of the topological susceptibility which turns out to be
entirely physical. In particular\, lattice artifact dislocations\, which
would give rise to power-law divergence\, do not seem to contribute in the
quantum continuum limit. Furthermore\, merons are also responsible for no
ntrivial theta vacuum effects and explain why the mass gap vanishes at $\\
theta=\\pi$. Our study raises hopes that a solid field theoretical identif
ication of the relevant topological degrees of freedom may also be achieva
ble in non-Abelian gauge theories.\n\nhttps://indico.cern.ch/event/764552/
contributions/3432095/
LOCATION: Shimao 1A+1B
URL:https://indico.cern.ch/event/764552/contributions/3432095/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice QCD calculation of the two-photon contributions to K_L to
mu+ mu- and pi0 to e+ e- decays
DTSTART;VALUE=DATE-TIME:20190618T091000Z
DTEND;VALUE=DATE-TIME:20190618T093000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3428252@indico.cern.ch
DESCRIPTION:Speakers: Norman Christ (Columbia University)\nThe rare second
-order weak decay $K_L \\to \\mu^+\\mu^-$ is precisely measured and sensit
ive to the structure of the weak interactions at short distances. However
\, these effects are obscured by a large third-order\, long-distance contr
ibution to this decay in which the muon pair is created by two photons. W
e will discuss the prospects for computing this third-order electroweak pr
ocess using lattice QCD. As a first step in such a calculation a method w
ill be presented for the lattice calculation of the simpler two-photon dec
ay $\\pi^0 \\to e^+ e^-$.\n\nhttps://indico.cern.ch/event/764552/contribut
ions/3428252/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3428252/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Calculating the two-photon contribution to the real part of the $\
\pi^0 \\rightarrow e^+ e^-$ decay amplitude
DTSTART;VALUE=DATE-TIME:20190618T093000Z
DTEND;VALUE=DATE-TIME:20190618T095000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3421216@indico.cern.ch
DESCRIPTION:Speakers: Yidi Zhao (Columbia University)\nThe important $K_L\
\rightarrow \\mu^+ \\mu^-$ decay is complicated by the presence of interme
diate states with the same or lower energy than the mass of kaon. To addre
ss one of these intermediate states\, the two-particle $\\gamma\\gamma$ st
ate\, it is useful to work on a simpler problem which offers the same diff
iculty --- the $\\pi^0 \\rightarrow e^+ e^-$ decay. We hope to present pr
eliminary results of a first-principles calculation of the real part of th
e $\\pi^0 \\rightarrow e^+ e^-$ decay amplitude to demonstrate the effect
iveness of our method.\n\nhttps://indico.cern.ch/event/764552/contribution
s/3421216/
LOCATION: Shimao 5
URL:https://indico.cern.ch/event/764552/contributions/3421216/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Meson Screening Masses in 2+1-Flavor QCD
DTSTART;VALUE=DATE-TIME:20190618T093000Z
DTEND;VALUE=DATE-TIME:20190618T095000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3446820@indico.cern.ch
DESCRIPTION:Speakers: Prasad Hegde (Indian Institute of Science)\nScreenin
g masses are useful observables since they provide information regarding t
he various excitations in the QGP\, as well as regarding the restoration o
f various symmetries. They are also easier to calculate in lattice QCD as
compared to temporal correlators. We present results from a high statistic
s determination of various meson screening correlators for temperatures be
tween approximately 140 MeV and 2.5 GeV. Using lattices with Nt = 6 - 16\,
we also provide a continuum extrapolation for the masses. We comment upon
the implications of our results regarding the restoration of chiral and a
xial symmetry in the quark-gluon plasma. Our lattices were generated using
the 2+1-flavor HISQ action\, with the strange quark fixed to its physical
value and the light quark taking one of two values: ml = ms/20 and ml = m
s/27.\n\nhttps://indico.cern.ch/event/764552/contributions/3446820/
LOCATION: Hankou
URL:https://indico.cern.ch/event/764552/contributions/3446820/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Scale setting for QCD with $N_f=3+1$ dynamical quarks
DTSTART;VALUE=DATE-TIME:20190618T083000Z
DTEND;VALUE=DATE-TIME:20190618T085000Z
DTSTAMP;VALUE=DATE-TIME:20201021T170640Z
UID:indico-contribution-764552-3420483@indico.cern.ch
DESCRIPTION:Speakers: Roman Höllwieser (University of Wuppertal)\nWe pres
ent first results of the scale setting for QCD with $N_f=3+1$ dynamical qu
arks on the lattice. We use a recently proposed massive renormalization sc
heme with a non-perturbatively determined clover coefficient. To relate th
e bare coupling of the simulations to a lattice spacing in fm\, we use dec
oupling of charm at low energy and the value of a dimensionless quantity $
\\sqrt(t_0^\\star)m_{had}$\, where $m_{had}$ is an experimentally accessib
le quantity and $t_0^\\star$ is the flow scale $t_0$ at our mass point wit
h $m_{up}=m_{down}=m_{strange}$ and a physical charm mass. We discuss the
setup\, tuning procedure\, simulation parameters and measurement results f
or two ensembles with different volumes and present a charmonium spectrum.
\n\nhttps://indico.cern.ch/event/764552/contributions/3420483/
LOCATION: Shimao 3A
URL:https://indico.cern.ch/event/764552/contributions/3420483/
END:VEVENT
END:VCALENDAR