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BEGIN:VEVENT
SUMMARY:QCD at nonzero temperature and density
DTSTART;VALUE=DATE-TIME:20200807T084000Z
DTEND;VALUE=DATE-TIME:20200807T090000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2148@conference-indico.kek.jp
DESCRIPTION:Speakers: Akira Ohnishi (Yukawa Institute for Theoretical Phys
ics\, Kyoto University)\nReplica evolution of classical field is proposed
as an approximate simulator of real-time quantum field dynamics at finite
temperatures. We consider $N$ classical field configurations $(\\phi_{\\tx
}\,\\pi_{\\tx} (\\tau=0\,1\,\\cdots N-1)$\, dubbed as replicas\, which int
eract with each other via the $\\tau$-derivative terms and evolve with the
classical equation of motion. The $\\tau$-derivative terms in the Hamilto
nian\, $\\xi^2 \\sum_x (\\phi_{x+\\hat{\\tau}}-\\phi_x)^2/2$\, correspond
to the kinetic part of the Euclidean action in the imaginary time formalis
m of the finite temperature quantum field theory by regarding the replica
index $\\tau$ as the imaginary time index.Thus the replica evolution is te
chnically the same as the molecular dynamics part of the hybrid Monte-Carl
o sampling. The partition function of replicas at temperature $\\xi$ is pr
oven to be proportional to that in quantum field theory at temperature $T=
\\xi/N$. At the same time\, the time dependence of the replica-index avera
ge of field variables is described by the classical equation of motion whe
n the fluctuations are small. We examine the statistical and dynamical pro
perties of the $\\phi^4$ theory in the 4+1 spacetime dimensions. We note t
hat the Rayleigh-Jeans divergence in the classical field can be removed in
replica evolution with $N \\geq 2$ by including the mass counterterm. We
also find that the thermal mass obtained from the unequal time correlation
function at zero momentum grows as a function of the coupling as in the p
erturbative estimate in the small coupling region. Hence the replica evolu
tion\, the classical field theory with improved quantum statistical proper
ty\, would be a candidate to represent the real-time evolution of quantum
field.\n\nhttps://conference-indico.kek.jp/event/113/contributions/2148/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2148/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Machine learning study on the Dirac eigenvalue spectrum of stagger
ed quarks
DTSTART;VALUE=DATE-TIME:20200804T062000Z
DTEND;VALUE=DATE-TIME:20200804T064000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2125@conference-indico.kek.jp
DESCRIPTION:Speakers: Sunkyu Lee (*) (Seoul National University)\nWe study
chirality of staggered quarks on the Dirac eigenvalue spectrum using mach
ine learning technique. As a result of theoretical research\, we expect a
characteristic pattern\, we call leakage pattern\, in the matrix elements
of the chirality operator sandwiched between two eigenstates of staggered
Dirac operator. Machine learning analysis gives 98.7(34)% accuracy per a s
ingle normal gauge configuration for classifying non-zero mode quartets in
Dirac eigenvalue spectrum. It confirms that the leakage pattern is univer
sal on normal gauge configurations. We choose the multi-layer perceptron (
MLP) method which is one of the deep learning models. It happens to give t
he best performance in our study. The model's prediction is compared with
other models'\, such as XGboost. Numerical study is done using HYP stagger
ed quarks on the $20^4$ lattice in quenched QCD.\n\nhttps://conference-ind
ico.kek.jp/event/113/contributions/2125/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2125/
END:VEVENT
BEGIN:VEVENT
SUMMARY:P-wave form factors from the inclusive semileptonic $B \\ rightarr
ow X_c \\ell \\nu$ decays
DTSTART;VALUE=DATE-TIME:20200804T082000Z
DTEND;VALUE=DATE-TIME:20200804T084000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2065@conference-indico.kek.jp
DESCRIPTION:Speakers: Gabriela Bailas (*) (KEK)\nWe report our estimation
for the Isgur-Wise form factors for the inclusive semileptonic $B \\to X_c
\\ell\\nu$ on 2+1-flavor lattice QCD. \nThe M\\"obius domain-wall fermion
action is used for light\, strange\, charm and bottom quarks. The structu
re function receives contributions from various exclusive modes\, includin
g the dominant S-wave states $D^{(*)}_s$ as well as the P-wave states $D_s
^{**}$. In this work\, we identify and separate these contributions in the
lattice data\, from \nwhich we put some constraints on the $B_s \\to D_s^
{**}\\ell\\nu$ form factors. Our work takes into account the structure fun
ctions for the cases of zero-recoil and non-zero recoil.\n\nhttps://confer
ence-indico.kek.jp/event/113/contributions/2065/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2065/
END:VEVENT
BEGIN:VEVENT
SUMMARY:First QCD+QED simulations with C* boundary conditions
DTSTART;VALUE=DATE-TIME:20200805T062000Z
DTEND;VALUE=DATE-TIME:20200805T064000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2131@conference-indico.kek.jp
DESCRIPTION:Speakers: Jens Lücke (*) (Humboldt University Berlin)\nFor th
e first time the openQ*D code was used to generate fully dynamical Nf=1+2+
1 QCD+QED configurations with C* boundary conditions and degenerate down a
nd strange quarks at an unphysical value of the electromagnetic coupling a
lpha~0.04. In this talk\, technical details about the generation\, will be
presented. In particular the stability of the algorithm\, diagnostic obse
rvables and neutral and charged meson masses will be discussed. Furthermor
e the chosen tuning strategy will be shortly presented.\n\nhttps://confere
nce-indico.kek.jp/event/113/contributions/2131/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2131/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Visualisations of the non-trivial QCD vacuum
DTSTART;VALUE=DATE-TIME:20200807T070000Z
DTEND;VALUE=DATE-TIME:20200807T072000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2068@conference-indico.kek.jp
DESCRIPTION:Speakers: James Biddle (*) (Centre for the Subatomic Structure
of matter\, Department of Physics\, The University of Adelaide)\nDespite
the success of quantum chromodynamics (QCD) in describing the strong nucle
ar force\, a clear picture of how this theory gives rise to the distinctiv
e properties of confinement and dynamical chiral symmetry breaking at low
energy is yet to be found. One of the more promising models used to explai
n these phenomena in recent times is known as the centre vortex model. In
this work we explore the properties of the gluon propagator in the context
of this model\, adding to the already substantial body of evidence suppor
ting the importance of centre vortices in QCD. We also present novel visua
lisation techniques that have been devised to allow for detailed hands-on
exploration of the centre-vortex structure of the QCD vacuum. These techni
ques provide new insight into the behaviour of centre vortices in low-ener
gy lattice QCD.\n\nhttps://conference-indico.kek.jp/event/113/contribution
s/2068/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2068/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Abelian and monopole dominance without gauge fixing in pure SU(3)
gauge theory
DTSTART;VALUE=DATE-TIME:20200806T080000Z
DTEND;VALUE=DATE-TIME:20200806T082000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2106@conference-indico.kek.jp
DESCRIPTION:Speakers: Katsuya Ishiguro (Kochi University)\nUnderstanding
the color confinement mechanism is not yet solved in QCD. The dual Meissne
r effect is one of the most promising pictures as the color confinement me
chanism. Recently the dual Meissner picture due to violation of the non-Ab
elian Bianchi identities was proposed. In this talk\, we show numerical re
sults based on that picture in pure SU(3) gauge theory\, especially almost
perfect Abelian dominance and monopole dominance for the static q-qbar po
tential without gauge fixing.\n\nhttps://conference-indico.kek.jp/event/11
3/contributions/2106/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2106/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Welcome and instructions
DTSTART;VALUE=DATE-TIME:20200804T045000Z
DTEND;VALUE=DATE-TIME:20200804T050000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2198@conference-indico.kek.jp
DESCRIPTION:https://conference-indico.kek.jp/event/113/contributions/2198/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2198/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sigma-Lambda state mixing from lattice QCD+QED
DTSTART;VALUE=DATE-TIME:20200806T082000Z
DTEND;VALUE=DATE-TIME:20200806T084000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2120@conference-indico.kek.jp
DESCRIPTION:Speakers: Zeno Kordov (*) (The University of Adelaide)\nMixing
in the $\\Sigma^0$--$\\Lambda^0$ system is a direct consequence of broken
isospin symmetry and is a measure of both isospin-symmetry breaking as we
ll as general SU(3)-flavour symmetry breaking. In this talk we present a n
ovel scheme for calculating the extent of the physical $\\Sigma^0$--$\\Lam
bda^0$ mixing using simulations in lattice QCD+QED and discuss some of its
features and initial results.\n\nhttps://conference-indico.kek.jp/event/1
13/contributions/2120/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2120/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chiral symmetry and the Roper resonance
DTSTART;VALUE=DATE-TIME:20200804T070000Z
DTEND;VALUE=DATE-TIME:20200804T072000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2180@conference-indico.kek.jp
DESCRIPTION:Speakers: Adam Virgili (*) (University of Adelaide)\nThe origi
n of the low-lying nature of the Roper resonance has been the subject of s
ignificant interest for many years\, including several investigations usin
g lattice QCD. It has been claimed that chiral symmetry plays an important
role in our understanding of this resonance. We present results from our
systematic examination of the potential role of chiral symmetry in the low
-lying nucleon spectrum through the direct comparison of the clover and ov
erlap fermion actions. After a brief summary of the background motivation\
, we specify the computational details of the study and outline our compar
ison methodologies. We do not find any strong evidence supporting the clai
m that chiral symmetry plays a significant role in understanding the Roper
resonance on the lattice.\n\nhttps://conference-indico.kek.jp/event/113/c
ontributions/2180/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2180/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Vacuum Restructuring in Finite Geometries: Nonperturbative Casimir
Effects in Lattice Gauge Theories
DTSTART;VALUE=DATE-TIME:20200805T062000Z
DTEND;VALUE=DATE-TIME:20200805T064000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2140@conference-indico.kek.jp
DESCRIPTION:Speakers: Alexander Molochkov (Pacific Quantum Center\, Far Ea
stern Federal University)\nThe Casimir effect is a quantum phenomenon root
ed in the fact that vacuum fluctuations of quantum fields are affected by
physical objects and boundaries. As the energy spectrum of vacuum fluctuat
ions depends on distances between (and geometries of) physical bodies\, th
e quantum vacuum exerts a small but experimentally detectable force on neu
tral objects. Usually\, the associated Casimir energy is calculated for fr
ee or weakly coupled quantum fields. Recent studies of the Casimir effect
in non-perturbative regimes within lattice gauge field theory are reviewed
in the present talk. We discuss vacuum restructuring in finite geometries
: the influence of the Casimir boundaries on the chiral and deconfining ph
ase transitions and the mass-scales.\n\nhttps://conference-indico.kek.jp/e
vent/113/contributions/2140/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2140/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Finite temperature study of a 4+6 flavor mass-split system
DTSTART;VALUE=DATE-TIME:20200804T052000Z
DTEND;VALUE=DATE-TIME:20200804T054000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2156@conference-indico.kek.jp
DESCRIPTION:Speakers: Curtis Peterson (*) (University of Colorado at Bould
er)\nNear-conformal systems are favored candidates to describe composite H
iggs or composite dark matter particles. Their finite temperature phase st
ructure may provide new insights into the dynamics. It is particularly imp
ortant to determine the order of the phase transition. Many-flavor near-co
nformal systems might exhibit a first-order phase transition with a possib
ly large latent heat. This could have important phenomenological implicati
ons\, e.g. the existence of primordial gravitational waves. In our study\,
we focus on a mass-split system with four light and six heavy flavors. \n
\nStarting with the phase structure of the mass-degenerate system\, we con
tinue to explore the mass-split system for different ratios of light flavo
r over heavy flavor masses.\n\nhttps://conference-indico.kek.jp/event/113/
contributions/2156/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2156/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pseudoscalar-Photon Transition Form Factors from Twisted Mass Latt
ice QCD
DTSTART;VALUE=DATE-TIME:20200807T082000Z
DTEND;VALUE=DATE-TIME:20200807T084000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2077@conference-indico.kek.jp
DESCRIPTION:Speakers: Sebastian Burri (*) (University of Bern)\nWe report
on our computation of the pseudoscalar-photon transition form factors from
twisted mass lattice QCD for three pseudoscalar states\, i.e. the neutral
pion and the eta and eta' mesons\, to determine the corresponding light p
seudoscalar pole contributions in the dispersive analysis of hadronic ligh
t by light scattering in the muon g-2.\nThe neutral pion transition form f
actor is computed directly at the physical point.\nWhile the eta and eta'
transition form factors are more numerically challenging than the one for
the neutral pion\, we present first results for the eta and eta' 3-point a
mplitude and explore methods for extracting the transition form factors.\n
\nhttps://conference-indico.kek.jp/event/113/contributions/2077/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2077/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Strategy of the Heavy quark Operator Product Expansion applied to
the Pion's Light Cone Distribution Amplitude
DTSTART;VALUE=DATE-TIME:20200807T050000Z
DTEND;VALUE=DATE-TIME:20200807T052000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2155@conference-indico.kek.jp
DESCRIPTION:Speakers: Robert Perry (*) (National Chiao Tung University)\nT
he Heavy quark Operator Product Expansion (HOPE) method allows one to extr
act information about light-cone matrix elements via local\, instant form
matrix elements. When applied to the calculation of the pion's light cone
distribution amplitude\, it allows (in principle) the full x dependence of
the distribution amplitude to be determined. In practice\, finite statist
ics and finite momenta mean that only a finite number of moments may be ex
tracted. In this talk\, I explain the HOPE method\, and show how boosting
the hadronic state leads to enhanced sensitivity to the moments. I also di
scuss some kinematical tricks which enable us to extract information about
the second moment at much low momenta than would be naively expected.\n\n
https://conference-indico.kek.jp/event/113/contributions/2155/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2155/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Three-Photon Decay of J/ψ from Latttice QCD
DTSTART;VALUE=DATE-TIME:20200806T072000Z
DTEND;VALUE=DATE-TIME:20200806T074000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2137@conference-indico.kek.jp
DESCRIPTION:Speakers: Yu Meng (*) (Peking University)\nThe rare decay J/ψ
→3γ\, analog to Ortho-positronium decaying to 3γ in quantum electrodyn
amics\, can provide a high precision test for the non-perturbative quantum
chromodynamics. Such a decay process was first observed by CLEO collabora
tion in 2008 and then by BESIII in 2013. However\, the relevant theoretica
l researches are very limited due to the dominant non-perturbative effects
. We propose to use lattice QCD to study this problem. To this end\, a new
method has been proposed\, that only the correlation functions directly r
elated to the physical decay width are computed with all polarizations of
the initial and final states summed over\, to avoid the complicated decomp
osition for the matrix element. Using this new method\, we present the fir
st lattice result for this rare decay. Such a new method has also been app
lied for the decay ηc→2γ\, and we obtain a lattice result that is cons
istent with the experimental one within two standard deviations for the fi
rst time. In the work of three-photon decay\, we also put forward a scheme
to analyze the Dalitz plot of the corresponding process based on the latt
ice data which can provide direct information for the relevant experiments
.\n\nhttps://conference-indico.kek.jp/event/113/contributions/2137/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2137/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Charmed meson decay constants from 2+1-flavor lattice QCD
DTSTART;VALUE=DATE-TIME:20200806T070000Z
DTEND;VALUE=DATE-TIME:20200806T072000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2130@conference-indico.kek.jp
DESCRIPTION:Speakers: Zhaofeng Liu (Institute of High Energy Physics\, Bei
jing)\nOn a lattice with 2+1-flavor dynamical domain-wall fermions at the
physical pion mass\, we calculate the decay constants of the charmed and l
ight vector mesons including D/D*\, Ds/Ds*\, phi and K*. The lattice size
is 48^3*96\, which corresponds to a spatial extension of ~5.5 fm with the
lattice spacing a~0.114 fm. For the valence quarks we use overlap fermions
at several mass points close to their physical values. The results are th
en interpolated/extrapolated to the physical point.\n\nhttps://conference-
indico.kek.jp/event/113/contributions/2130/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2130/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards color superconductivity on the lattice --- perturbative pr
edictions and the complex Langevin method
DTSTART;VALUE=DATE-TIME:20200807T080000Z
DTEND;VALUE=DATE-TIME:20200807T082000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2197@conference-indico.kek.jp
DESCRIPTION:Speakers: Takeru YOKOTA (*) (The University of Tokyo)\nThe pha
se structure of QCD at finite density is expected to be revealed by the co
mplex Langevin method (CLM)\, which is a promising approach to overcome th
e sign problem. In particular\, we discuss the possibility of investigatin
g the color superconductivity (CSC) on the lattice by the CLM. Towards tha
t end\, we predict the parameter region in which CSC occurs in lattice per
turbation theory based on the gap equation. Our perturbative calculations
are justified by considering a small spatial volume due to the asymptotic
freedom. Most notably\, we can predict the explicit form of the Cooper pai
rs without imposing any ansatz.\n\nhttps://conference-indico.kek.jp/event/
113/contributions/2197/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2197/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Baryons in the Gross-Neveu model in 1+1 dimensions at finite numbe
r of flavors
DTSTART;VALUE=DATE-TIME:20200807T082000Z
DTEND;VALUE=DATE-TIME:20200807T084000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2151@conference-indico.kek.jp
DESCRIPTION:Speakers: Laurin Pannullo (*) (Goethe University Frankfurt)\nI
n a recent work we investigated the existence of inhomogeneous chiral phas
es (i.e.\, a phase where the chiral condensate has a spatial dependence) i
n the 1+1-dimensional Gross-Neveu model at finite number of fermion flavor
s. In the present work we continue this investigation by studying the form
ation of baryons\, their spatial distribution and their relation to the in
homogeneous chiral condensate.\n\nhttps://conference-indico.kek.jp/event/1
13/contributions/2151/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2151/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Parton distribution functions of $\\Delta^+$ on the lattice
DTSTART;VALUE=DATE-TIME:20200807T084000Z
DTEND;VALUE=DATE-TIME:20200807T090000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2128@conference-indico.kek.jp
DESCRIPTION:Speakers: Yuan Li (*) (Peking University)\nWe perform a first
calculation for the unpolarized parton distribution function of the $\\Del
ta^+$ baryon using lattice QCD simulations within the framework of Large M
omentum Effective Theory. Two ensembles of $N_f=2+1+1$ twisted mass fermio
ns are utilized with a pion mass of 270 MeV and 360 MeV\, respectively. T
he baryon\, which is treated as a stable single-particle state\, is booste
d with momentum $P_3$ with values $\\{0.42\,0.83\,1.25\\}$ GeV\, and we ut
ilize momentum smearing to improve the signal. The unpolarized parton dist
ribution function of $\\Delta^+$ is obtained using a non-perturbative reno
rmalization and a one-loop formula for the matching\, with encouraging pre
cision. In particular\, we compute the $\\overline{d}(x)-\\overline{u}(x)$
asymmetry and compare it with the same quantity in the nucleon\, in a fir
st attempt towards resolving the physical mechanism responsible for genera
ting such asymmetry.\n\nhttps://conference-indico.kek.jp/event/113/contrib
utions/2128/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2128/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The lattice Yang-Mills theory with a gauge-invariant gluon mass in
view of the gauge-invariant BEH mechanism towards confinement
DTSTART;VALUE=DATE-TIME:20200807T074000Z
DTEND;VALUE=DATE-TIME:20200807T080000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2169@conference-indico.kek.jp
DESCRIPTION:Speakers: Akihiro SHIBATA (Computing Research Center\, KEK)\nA
t the last lattice conference\, we have proposed to investigate the massiv
e Yang-Mills model\, namely\, Yang-Mills theory with a gauge-invariant glu
on mass term\, in order to clarify the mechanism of quark confinement in t
he Yang-Mills theory with massgap. The gluon mass term simulates the dynam
ically generated mass to be extracted in the low-energy effective theory
of the Yang-Mills theory and plays the role of a new probe to study the ph
ase structure and confinement mechanism.\nIn this talk\, we first review
the massive Yang-Mills model\, whose gauge-invariant gluon mass term is de
duced from a specific gauge-scalar model with a single radially-fixed scal
ar field under a suitable constraint called the reduction condition\, and
why such a gauge-scalar model is constructed without breaking the gauge sy
mmetry through the gauge-independent description of the Brout-Englert-Higg
s mechanism which does not rely on the spontaneous breaking of gauge symme
try. Then\, we discuss how the numerical simulations for the proposed mas
sive Yang-Mills theory can be performed by taking into account he reducti
on condition in the complementary gauge-scalar model on a lattice.\n\nhttp
s://conference-indico.kek.jp/event/113/contributions/2169/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2169/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Double-winding Wilson loops towards flux tube interaction in SU(N)
lattice gauge theory
DTSTART;VALUE=DATE-TIME:20200807T072000Z
DTEND;VALUE=DATE-TIME:20200807T074000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2115@conference-indico.kek.jp
DESCRIPTION:Speakers: Seikou Kato (Oyama National College of Technology)\n
We study ""shifted"" double-winding Wilson loop average in SU(N) lattice Y
ang-Mills theory by using both strong coupling expansions and numerical si
mulations.\nWe evaluate its average by changing the distance of a transver
se direction. \nFrom this result\, we discuss how interactions between the
two color flux tubes change\, when the distance $R$ is varied.\n\nhttps:/
/conference-indico.kek.jp/event/113/contributions/2115/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2115/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chiral symmetry and taste symmetry on the eigenvalue spectrum of s
taggered Dirac operators
DTSTART;VALUE=DATE-TIME:20200804T060000Z
DTEND;VALUE=DATE-TIME:20200804T062000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2111@conference-indico.kek.jp
DESCRIPTION:Speakers: Hwancheol Jeong (*) (Seoul National University)\nChi
rality of HYP-smeared staggered quarks and its matrix elements on Dirac ei
genspace are studied. We introduce a new chirality operator and a new shif
t operator\, and show that chiral Ward identities relate them. Leakage is
defined as matrix elements between two eigenstates of the staggered Dirac
operator\, which represents the transition matrix from one eigenstate to t
he other. Numerical evidence of Ward identities on leakage patterns for th
e chirality and shift operators is presented. We also show that approximat
e conservation of taste symmetry appears as a characteristic of leakage pa
tterns of the chirality\, which allows us to distinguish would-be zero mod
es from non-zero modes. The amount of the unphysical leakages indicates th
e size of the taste symmetry breaking.\n\nhttps://conference-indico.kek.jp
/event/113/contributions/2111/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2111/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Field Selection Algorithm for Correlation Functions
DTSTART;VALUE=DATE-TIME:20200804T080000Z
DTEND;VALUE=DATE-TIME:20200804T082000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2170@conference-indico.kek.jp
DESCRIPTION:Speakers: Xia Shicheng (*) (Peking University)\nThe most compu
tational cost in typical lattice QCD simulation is doing the invertion to
obtain the propagator. While it is a huge waste to free the propagators in
RAM after the contraction. This work explores a field selection algorithm
for the correlation functions. The field selection algorithm constructs t
he correlation function by selecting point on the lattice. It is found tha
t almost the same precision can be obtained at three point function and tw
o point function with about 1/100 point of full lattice. The field select
ion algorithm has a huge advantage to save the propagators on disk and als
o to accelerate the complex contraction.\n\nhttps://conference-indico.kek.
jp/event/113/contributions/2170/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2170/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Supercomputer Fugaku and QCD Wide SIMD Library (QWS) on Fugaku
DTSTART;VALUE=DATE-TIME:20200804T070000Z
DTEND;VALUE=DATE-TIME:20200804T072000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2144@conference-indico.kek.jp
DESCRIPTION:Speakers: Yoshifumi Nakamura (RIKEN)\nThe supercomputer Fugaku
is a new supercomputer in Kobe\, Japan\, co-developed by RIKEN with Fujit
su\, and the top system of the latest June 2020 TOP500 supercomputers. I w
ill introduce the supercomputer Fugaku and a Lattcie QCD simulation librar
y\, QCD Wide SIMD library (QWS) for Fugaku. I will also present some tunin
g methods for Fugaku\, QWS performance on Fugaku\, and tentative benchmark
results on full system of Fugaku.\n\nhttps://conference-indico.kek.jp/eve
nt/113/contributions/2144/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2144/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Using Xilinx Alveo accelerators for Lattice QCD
DTSTART;VALUE=DATE-TIME:20200804T074000Z
DTEND;VALUE=DATE-TIME:20200804T080000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2119@conference-indico.kek.jp
DESCRIPTION:Speakers: Piotr Korcyl (Jagiellonian University)\nLattice QCD
is one of the major scientific work-loads on supercomputer installations.
Most of the computer time is spent in an iterative solver of a large\, spa
rse set of linear equations. One of the simplest examples of such an itera
tive solver is the conjugate gradient algorithm. In this talk\, we present
an optimized implementation of this algorithm in the context of Lattice Q
CD for Xilinx Alveo U280 accelerator cards. We compare its performance wit
h that obtained on a CPU architecture and highlight the advantages of an F
PGA-based implementation.\n\nhttps://conference-indico.kek.jp/event/113/co
ntributions/2119/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2119/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Implementation of neighboring communication in QWS
DTSTART;VALUE=DATE-TIME:20200804T072000Z
DTEND;VALUE=DATE-TIME:20200804T074000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2112@conference-indico.kek.jp
DESCRIPTION:Speakers: Issaku Kanamori (RIKEN)\nAs parallel systems become
massive\, the neighboring communication in lattice QCD becomes more and mo
re important.\nIn this talk\, I will focus on the implementation of neighb
oring communication in QCD Wide SIMD library (QWS) for the supercomputer F
ugaku.\nWe adopt the double buffering algorithm and implement it on top of
a wrapper library to call the uTofu API\, which is a low level interface
for the TofuD interconnect.\nThe wrapper part is independent from the othe
r part of QWS and can be used from the other applications. As an example\
, we use it in solving 2-dimensional Poisson equation.\n\nhttps://conferen
ce-indico.kek.jp/event/113/contributions/2112/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2112/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Near-conformal dynamics in a chirally broken system
DTSTART;VALUE=DATE-TIME:20200804T050000Z
DTEND;VALUE=DATE-TIME:20200804T052000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2188@conference-indico.kek.jp
DESCRIPTION:Speakers: Oliver Witzel (University of Colorado Boulder)\nComp
osite Higgs models must exhibit very different dynamics from quantum chrom
odynamics (QCD) regardless whether they describe the Higgs boson as a dila
ton-like state or a pseudo-Nambu-Goldstone boson. Large separation of scal
es and large anomalous dimensions are frequently desired by phenomenologi
cal models. Mass-split systems are well-suited for composite Higgs models
because they are governed by a conformal fixed point in the ultraviolet bu
t are chirally broken in the infrared. In this work we use lattice field
theory calculations with domain wall fermions to investigate a system with
four light and six heavy flavors. We demonstrate how a nearby conformal f
ixed point affects the properties of the four light flavors that exhibit
chiral symmetry breaking in the infrared. Specifically we describe hyper
scaling of dimensionful physical quantities and determine the correspondin
g anomalous mass dimension. We obtain y_m=1+gamma^*= 1.47(5) suggesting th
at N_f=10 lies inside the conformal window. Comparing the low energy spect
rum to predictions of dilaton chiral perturbation theory\, we observe exce
llent agreement which supports the expectation that the 4+6 mass-split sys
tem exhibits near-conformal dynamics with a relatively light 0^++ isosingl
et scalar.\n\nhttps://conference-indico.kek.jp/event/113/contributions/218
8/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2188/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dark matter and gravitational waves
DTSTART;VALUE=DATE-TIME:20200804T054000Z
DTEND;VALUE=DATE-TIME:20200804T060000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2160@conference-indico.kek.jp
DESCRIPTION:Speakers: Enrico Rinaldi (RIKEN)\nWith non-perturbative lattic
e calculations we investigate the finite-temperature confinement transitio
n of a composite dark matter model. We focus on the regime in which this e
arly-universe transition is first order and would generate a stochastic ba
ckground of gravitational waves. Future searches for stochastic gravitatio
nal waves will provide a new way to discover or constrain composite dark m
atter\, in addition to direct-detection and collider experiments. As a fir
st step to enabling this phenomenology\, we determine how heavy the dark f
ermions need to be in order to produce a first-order stealth dark matter c
onfinement transition.\n\nhttps://conference-indico.kek.jp/event/113/contr
ibutions/2160/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2160/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Space-time structure in the Lorentzian type IIB matrix model in th
e large-N limit
DTSTART;VALUE=DATE-TIME:20200805T060000Z
DTEND;VALUE=DATE-TIME:20200805T062000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2103@conference-indico.kek.jp
DESCRIPTION:Speakers: Mitsuaki Hirasawa (*) (SOKENDAI)\nThe Lorentzian typ
e IIB matrix model is a promising candidate for a non-perturbative formula
tion of superstring theory. In the previous work\, Monte Carlo calculation
s provided interesting results indicating the spontaneous breaking of SO(9
) to SO(3) and the emergence of (3+1)-dimensional space-time. There\, an a
pproximation was used to avoid the sign problem\, however. In this talk\,
we report our results obtained by using the complex Langevin method to ove
rcome the sign problem instead of using the approximation. In particular\,
we discuss the space-time structure in the large-N limit based on our res
ults obtained for large matrix size.\n\nhttps://conference-indico.kek.jp/e
vent/113/contributions/2103/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2103/
END:VEVENT
BEGIN:VEVENT
SUMMARY:*** CANCELLED*** Extending Lattice H2 to AdS3
DTSTART;VALUE=DATE-TIME:20200805T054000Z
DTEND;VALUE=DATE-TIME:20200805T060000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2084@conference-indico.kek.jp
DESCRIPTION:Speakers: Cameron Cogburn (*) (Boston University)\nIn a recent
work\, we describe and quantify a method for setting up a lattice for qua
ntum field theory in AdS2 based on the triangle group\, which enables maxi
mally symmetric tilings of hyperbolic space. Here we extend this lattice s
etup to the AdS3 cylinder via Hamiltonian methods\, enabling us to study d
ynamical systems. We verify basic properties of this discretized Euclidean
AdS3 space with the continuum\, such as propagators and the four-point fu
nction. For the latter\, using a ``conformal center of mass frame" we are
able to make the kinematic variables of the configuration conformal\, prov
iding a convenient framework for further study.\n\nhttps://conference-indi
co.kek.jp/event/113/contributions/2084/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2084/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The effects of fermions in the complex Langevin simulation of the
Lorentzian type IIB matrix model
DTSTART;VALUE=DATE-TIME:20200805T052000Z
DTEND;VALUE=DATE-TIME:20200805T054000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2099@conference-indico.kek.jp
DESCRIPTION:Speakers: Kohta HATAKEYAMA (*) (KEK)\nThe type IIB matrix mode
l was proposed as a nonperturbative formulation of superstring theory. In
particular\, interesting results such as the emergence of (3+1)D exponenti
ally expanding space-time have been obtained from the Lorentzian version o
f the model. Recently the complex Langevin simulation of the bosonic model
has been performed to avoid the previously used approximation in overcomi
ng the sign problem. In this talk\, we include the effects of fermions in
this simulation to discuss their impact on the (3+1)D space-time structure
.\n\nhttps://conference-indico.kek.jp/event/113/contributions/2099/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2099/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Complex Langevin analysis of the spontaneous breaking of 10D rotat
ional symmetry in the Euclidean IKKT matrix model
DTSTART;VALUE=DATE-TIME:20200805T050000Z
DTEND;VALUE=DATE-TIME:20200805T052000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2063@conference-indico.kek.jp
DESCRIPTION:Speakers: Takehiro Azuma (Setsunan University)\nThe IKKT matri
x model is a promising candidate for a nonperturbative formulation of supe
rstring theory\, in which spacetime is conjectured to emerge dynamically f
rom the microscopic matrix degrees of freedom in the large-N limit. Indeed
in the Lorentzian version\, Monte Carlo studies suggested the emergence o
f (3+1)-dimensional expanding space-time. Here we study the Euclidean vers
ion instead\, and investigate an alternative scenario for dynamical compac
tification of extra dimensions via the spontaneous symmetry breaking (SSB)
of 10D rotational symmetry. We perform numerical simulations based on the
complex Langevin method (CLM) in order to avoid a severe sign problem. Fu
rthermore\, in order to avoid the singular-drift problem in the CLM\, we d
eform the model and determine the SSB pattern as we vary the deformation p
arameter. From these results\, we conclude that the original model has an
SO(3) symmetric vacuum\, which is consistent with previous results obtaine
d by the Gaussian expansion method (GEM). We also apply the GEM to the def
ormed matrix model and find consistency with the results obtained by the C
LM.\n\nhttps://conference-indico.kek.jp/event/113/contributions/2063/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2063/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Progress in the lattice studies of Sp(4) gauge theory with antisym
metric fermions
DTSTART;VALUE=DATE-TIME:20200804T082000Z
DTEND;VALUE=DATE-TIME:20200804T084000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2124@conference-indico.kek.jp
DESCRIPTION:Speakers: Jong-Wan Lee (Pusan National University)\nWe report
the progress in the lattice studies of Sp(4) gauge theory coupled to fermi
ons in the antisymmetric representation. Such a theory containing three Di
rac flavors has a direct relevance to the phenomenological model building
for certain types of composite Higgs and top partial compositeness. We for
mulate the lattice action with the standard plaquette and the Wilson-Dirac
fermions. Our primary interests are in the mass spectra and the decay con
stants of (flavored) spin-0 and spin-1 mesons. In the quenched setup we me
asure these quantities at several values of the lattice spacing and valenc
e fermion mass\, and extrapolate the results to the continuum and the mass
less limits. Towards the dynamical calculations we also present some preli
minary results by focusing on the finite volume effects and the mass depen
dence at finite lattice spacing.\n\nhttps://conference-indico.kek.jp/event
/113/contributions/2124/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2124/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Complex Langevin Simulations of Low-dimensional Supersymmetric Qua
ntum Field Theories
DTSTART;VALUE=DATE-TIME:20200804T080000Z
DTEND;VALUE=DATE-TIME:20200804T082000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2121@conference-indico.kek.jp
DESCRIPTION:Speakers: Arpith Kumar (*) (IISER Mohali)\nUsing complex Lange
vin dynamics\, we probe the possibility of dynamical breaking of supersymm
etry in a class of low-dimensional N=2 supersymmetric quantum field theori
es with complex potentials. We conclude that complex Langevin dynamics can
reliably predict the nonperturbative breaking of supersymmetry in cases w
here Monte Carlo methods are unreliable.\n\nhttps://conference-indico.kek.
jp/event/113/contributions/2121/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2121/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Scattering of Goldstone bosons in SU(2) with Nf=2 fundamental ferm
ions
DTSTART;VALUE=DATE-TIME:20200804T074000Z
DTEND;VALUE=DATE-TIME:20200804T080000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2086@conference-indico.kek.jp
DESCRIPTION:Speakers: Vincent Drach (University of Plymouth)\nWe present t
he first lattice calculation of the scattering amplitude of Goldstone boso
ns in the singlet channel relevant to test the viability of a composite Hi
ggs scenario beyond the Standard Model. In such a framework\, the scatteri
ng of the underlying Goldstone bosons controls the properties of the Higgs
boson. The Higgs boson properties are constrained by the Standard Model a
nd experimentally measured by the CERN experiments and therefore provide s
tringent tests of models of new physics.\nIn this work we focus on a SU(2)
gauge theory with 2 flavours of Dirac fermions in the fundamental represe
ntation\, a minimal UV completion of a composite Higgs model. We calculat
e the scattering amplitude near threshold of two of two Goldstone bosons i
n the singlet channel. The first principle prediction sheds light on the v
iability of the model.\n\nhttps://conference-indico.kek.jp/event/113/contr
ibutions/2086/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2086/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fermion-Higgs composite state mass in a SU(2) Wilson-Yukawa model
DTSTART;VALUE=DATE-TIME:20200804T072000Z
DTEND;VALUE=DATE-TIME:20200804T074000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2059@conference-indico.kek.jp
DESCRIPTION:Speakers: Vincenzo Afferrante (*) (University of Graz)\nA corr
ect non perturbative treatment of gauge theories requires physical particl
es to be described by gauge invariant operators. It is then appropriate t
o use composite operators made of elementary gauge dependant fields as ph
ysical observables.\n\nhttps://conference-indico.kek.jp/event/113/contribu
tions/2059/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2059/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Domain Wall and Overlap Fermions in 2+1D
DTSTART;VALUE=DATE-TIME:20200804T070000Z
DTEND;VALUE=DATE-TIME:20200804T072000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2189@conference-indico.kek.jp
DESCRIPTION:Speakers: Jude Worthy (*) (Swansea University)\nLayered system
s such as graphene have become an important area of investigation. Within
the broader programme of investigating critical phenomena in such systems\
, we look at different mass configurations for domain wall fermions and ov
erlap fermions in 2+1D. The equivalence between formulations is reviewed\,
and formulations for the condensate and susceptibility are given. Localit
y of fermion operators is required for the recovery of U(2) symmetry and i
s demonstrated with numerical experiments. Further aspects are also consid
ered.\n\nhttps://conference-indico.kek.jp/event/113/contributions/2189/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2189/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Glueball dark matter in SU(N) lattice gauge theory
DTSTART;VALUE=DATE-TIME:20200807T062000Z
DTEND;VALUE=DATE-TIME:20200807T064000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2192@conference-indico.kek.jp
DESCRIPTION:Speakers: Nodoka Yamanaka (University of Massachusetts Amherst
)\nThe glueballs in the SU(N) Yang-Mills theory are theoretically the most
natural among composite dark matter scenarios.\nIn this work\, we evaluat
e the interglueball potential in SU(N) lattice gauge theories using the HA
LQCD method and derive the glueball dark matter scattering cross section\,
and then constrain the scale parameter of the gauge theory from the obser
vational data.\n\nhttps://conference-indico.kek.jp/event/113/contributions
/2192/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2192/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nuclear force from lattice QCD with LapH smearing
DTSTART;VALUE=DATE-TIME:20200807T060000Z
DTEND;VALUE=DATE-TIME:20200807T062000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2173@conference-indico.kek.jp
DESCRIPTION:Speakers: Takuya Sugiura (*) (RIKEN iTHEMS)\nRecent studies by
HAL QCD collaboration have been successful in calculating hadron interact
ions from the first principles of QCD. In this talk\, we apply the Laplaci
an Heaviside (LapH) smearing for the two nucleon source operator to enhanc
e overlap with the low-energy elastic states and calculate the s-wave nucl
ear force. Our potential with the LapH smeared source has similar structur
e and comparable statistical errors to that with the standard wall source
operator. This will be an important step towards future extension to the P
-wave nuclear forces.\n\nhttps://conference-indico.kek.jp/event/113/contri
butions/2173/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2173/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hybrid static potentials at small quark-antiquark separations
DTSTART;VALUE=DATE-TIME:20200807T054000Z
DTEND;VALUE=DATE-TIME:20200807T060000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2159@conference-indico.kek.jp
DESCRIPTION:Speakers: Carolin Riehl (*) (Goethe University Frankfurt)\nWe
compute hybrid static potentials in SU(2) lattice gauge theory using a mul
tilevel algorithm and three different small lattice spacings. The resultin
g static potentials\, which are valid for quark-antiquark separations as s
mall as 0.05 fm\, are important e.g. when computing masses of heavy hybrid
mesons in the Born-Oppenheimer approximation. We also discuss and exclude
possible systematic errors from topological freezing\, the finite lattice
volume and glueball decays.\n\nhttps://conference-indico.kek.jp/event/113
/contributions/2159/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2159/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Investigation of Doubly Heavy Tetraquark Systems using Lattice QCD
DTSTART;VALUE=DATE-TIME:20200807T052000Z
DTEND;VALUE=DATE-TIME:20200807T054000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2157@conference-indico.kek.jp
DESCRIPTION:Speakers: Martin Pflaumer (*) (Goethe University Frankfurt)\nW
e search for possibly existent bound states in the heavy-light tetraquark
channels with quark content $ \\bar{b}\\bar{b}ud $\, $ \\bar{b}\\bar{b}us
$ and $ \\bar{b}\\bar{c}ud $ using lattice NRQCD for the heavy quarks. We
use different gauge link ensembles with $ N_f=2+1 $ flavours of domain-wal
l fermions and consider a basis of local and non-local interpolators. Besi
des extracting the energy spectrum from the correlation matrix\, we perfor
m additionally a Lüscher analysis to extrapolate our results to infinite
volume.\n\nhttps://conference-indico.kek.jp/event/113/contributions/2157/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2157/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Finite volume effects and meson scattering in the 2-flavour Schwin
ger model
DTSTART;VALUE=DATE-TIME:20200807T050000Z
DTEND;VALUE=DATE-TIME:20200807T052000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2076@conference-indico.kek.jp
DESCRIPTION:Speakers: Patrick Bühlmann (*) (University of Bern)\nWe inves
tigate the two-flavour Schwinger model in the canonical formulation with f
ixed fermion number.\nWe use Wilson fermions on the lattice and present a
formalism which describes the Dirac operator with dimensionally reduced ca
nonical operators.\nThese reduced operators allow the direct examination o
f different meson sectors and the determination of the energy spectrum in\
neach of the sectors. Using Lüscher's finite-volume mass-shift formula we
discuss the 1-meson mass as well as the effective 3-meson coupling.\nFrom
the 2-meson energies we determine the scattering phase shifts and compare
the 3-meson energies in the finite volume to various\npredictions based o
n scattering theory.\n\nhttps://conference-indico.kek.jp/event/113/contrib
utions/2076/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2076/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Application of the tempered Lefschetz thimble method to a chiral r
andom matrix model
DTSTART;VALUE=DATE-TIME:20200805T072000Z
DTEND;VALUE=DATE-TIME:20200805T074000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2136@conference-indico.kek.jp
DESCRIPTION:Speakers: Nobuyuki Matsumoto (*) (Kyoto University)\nMonte Car
lo simulations of finite density QCD is plagued by the sign problem. The t
empered Lefschetz thimble method (TLTM) [Fukuma-Umeda(1703.00861)] is a pr
omising algorithm towards solving the sign problem\, where the integration
region is deformed into the complex space and the system is parallel-temp
ered with the flow time so as to solve both sign and ergodicity problems s
imultaneously. In this talk\, we apply the TLTM to a chiral random matrix
model\, which models finite density QCD in the large N limit. We show that
the TLTM correctly reproduces exact results for small N and discuss the s
caling of the computational cost as N increases [Fukuma-NM-Umeda(in prepar
ation)]. We also explain how to implement HMC algorithm to the TLTM [Fukum
a-NM-Umeda(1912.13303)].\n\nhttps://conference-indico.kek.jp/event/113/con
tributions/2136/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2136/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The applications of quantum computing techniques to lattice gauge
theory and quantum noise mitigation
DTSTART;VALUE=DATE-TIME:20200805T084000Z
DTEND;VALUE=DATE-TIME:20200805T090000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2183@conference-indico.kek.jp
DESCRIPTION:Speakers: Xiaoyang Wang (*) (Peking University)\nDue to the ex
istence of sign problem in the Lattice QCD simulation with finite chemical
potential\, the traditional Monte-Carlo simulations on classical supercom
puters are confronted with significant difficulties on achieving high prec
ision. On the other hand\, with the fast development of quantum computers\
, it might be possible to provide the ultimate solution to sign problem in
the future. However\, constrained by the nature of NISQ quantum hardware
in the current days\, quantum noise is one of the main barriers which prev
ent the realistic applications of quantum computers. Here I will introduce
an optimization algorithm\, which is run on current quantum devices and h
as been applied to a 1+1 dimension lattice gauge theory. I will also talk
about a method to mitigate the quantum noise in an efficient way\, which h
as been tested on IBM-Q quantum hardwares.\n\nhttps://conference-indico.ke
k.jp/event/113/contributions/2183/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2183/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum Links for U(1) Gauge Theory on Qubits and Reduction to Z2
Gauge Theory and Toric Code
DTSTART;VALUE=DATE-TIME:20200805T082000Z
DTEND;VALUE=DATE-TIME:20200805T084000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2116@conference-indico.kek.jp
DESCRIPTION:Speakers: Hiroki Kawai (*) (Boston University)\nThe quantum li
nk Hamiltonian was introduced two decades ago as an alternative to Wilson
’s Euclidean lattice QCD with gauge fields represented by bi-linearfermi
on/anti-fermion operators\, and later generalized as D-theory. Recasting a
s a Hamiltonian in Minkowski space for real time evolution\, D-theory le
ads naturally to quantum algorithms. We investigate the simplest toy model
of U(1) compact QED on triangular 2+1D lattice and construct gauge invari
ant kernels via the Suzuki-Trotter expansions which are realized as a quan
tum circuit capable of being tested on the Noisy Intermediate Scale Quantu
m (NISQ) devices. We demonstrate the performance of our algorithm on the
existing hardware called IBM-Q with error mitigation. Furthermore\, we al
so explore the similarity of our model to the Z2 gauge theory. Since its s
implest example without dynamics\, so-called toric code\, can be leveraged
as the quantum error correcting code\, we may find a clue to an efficient
scalable error correction/detection algorithm specifically for our model
based on the relation between U(1) and Z2.\n\nhttps://conference-indico.ke
k.jp/event/113/contributions/2116/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2116/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bayesian Model Averaging
DTSTART;VALUE=DATE-TIME:20200805T074000Z
DTEND;VALUE=DATE-TIME:20200805T080000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2110@conference-indico.kek.jp
DESCRIPTION:Speakers: William Jay (*) (Fermilab)\nStatistical modeling pla
ys a key role in lattice field theory calculations. Examples including ext
racting masses from correlation functions or taking the chiral-continuum l
imit of a matrix element. We discuss the method of model averaging\, a way
to account for uncertainty due to model variations\, from the perspective
of Bayesian statistics. Statistical formulas are derived for model-averag
ed expectation values and for estimating the required model probability we
ights. In addition\, we reframe the common problem of data subset selectio
n (e.g. choice of minimum time separation for fitting a two-point correlat
ion function) as a model selection problem and study model averaging as a
universal alternative to hand tuning of fit ranges.\n\nhttps://conference-
indico.kek.jp/event/113/contributions/2110/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2110/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Machine Learning and Histogram Reweighting: Detecting and Studying
Phase Transitions
DTSTART;VALUE=DATE-TIME:20200805T080000Z
DTEND;VALUE=DATE-TIME:20200805T082000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2064@conference-indico.kek.jp
DESCRIPTION:Speakers: Dimitrios Bachtis (*) (Swansea University)\nWe prese
nt a synergistic approach between machine learning and histogram reweighti
ng to discover and study phase transitions in physical systems. We treat t
he output of a neural network\, designed for phase classification\, as an
observable in a statistical system enabling its extrapolation over continu
ous ranges in parameter space using histogram reweighting. The approach\,
which leads to quantitative results and overcomes the need to understand t
he studied system in detail\, is applied to the two-dimensional Ising mode
l by training a convolutional neural network to separate its symmetric and
broken-symmetry phases. We further demonstrate that the Ising-trained ne
ural network is sufficient to predict the phase transition in q-state Pott
s models and the $\\phi^4$ scalar field theory under a change of order\, u
niversality class or the presence of continuous or discrete degrees of fre
edom. Finally\, we present calculations of critical exponents and the crit
ical coupling for the Ising model and the $\\phi^4$ scalar field theory us
ing a finite size scaling analysis on quantities derived entirely from the
neural network implementation and their histogram-reweighted extrapolatio
ns.\n\nhttps://conference-indico.kek.jp/event/113/contributions/2064/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2064/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sign problem and the tempered Lefschetz thimble method
DTSTART;VALUE=DATE-TIME:20200805T070000Z
DTEND;VALUE=DATE-TIME:20200805T072000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2091@conference-indico.kek.jp
DESCRIPTION:Speakers: Masafumi Fukuma (Kyoto University)\nTempered Lefsche
tz thimble method (TLTM) [Fukuma-Umeda(1703.00861)] is an algorithm toward
s solving the numerical sign problem. There\, the integration region is de
formed into the complex space following the antiholomorphic gradient flow
equation\, and the system is parallel-tempered using the flow time as a te
mpering parameter so as to solve both sign and ergodicity problems simulta
neously. In this talk\, I explain the basics of the algorithm\, and discus
s its application to various models\, including the Thirring model\, the H
ubbard model away from half filling\, and the theta vacuum with finite the
ta. An application to a chiral matrix model (a toy model of finite density
QCD) will be discussed by Nobuyuki Matsumoto in his talk.\n\nhttps://conf
erence-indico.kek.jp/event/113/contributions/2091/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2091/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Partial deconfinement for some bosonic matrix models
DTSTART;VALUE=DATE-TIME:20200805T062000Z
DTEND;VALUE=DATE-TIME:20200805T064000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2184@conference-indico.kek.jp
DESCRIPTION:Speakers: Hiromasa Watanabe (*) (University of Tsukuba)\nWe pr
ovide evidence for partial deconfinement by using lattice Monte Carlo simu
lations of some bosonic matrix models.\nPartial deconfinement is the pheno
menon that coexists the confined and deconfined phases in the system\, in
particular of several large-N gauge theories\, at finite temperature.\nBy
appropriately fixing the gauge\, we observe that only submatrices deconfin
e in the analysis of the gauged-Gaussian matrix model and the Yang-Mills m
atrix model. \nWe also discuss the applications to QCD.\n\nhttps://confere
nce-indico.kek.jp/event/113/contributions/2184/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2184/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Complex Langevin analysis of 2D U(1) gauge theory on a torus with
a θ term
DTSTART;VALUE=DATE-TIME:20200805T052000Z
DTEND;VALUE=DATE-TIME:20200805T054000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2193@conference-indico.kek.jp
DESCRIPTION:Speakers: Atis Yosprakob (*) (SOKENDAI)\nMonte Carlo simulatio
n of gauge theories with a theta term is known to be extremely difficult d
ue to the sign problem. We consider the complex Langevin method (CLM)\, wh
ich is one of the approaches to overcome this problem. As a first step\, w
e apply the method to 2D U(1) gauge theory with a theta term\, which can b
e solved analytically. We find that naive implementation of the method fai
ls because of the topological nature of the theta term. In order to circum
vent this problem\, we introduce a puncture on the torus. We find that the
CLM works and reproduces the exact results for the punctured model even a
t large theta. We also prove that the punctured model is equivalent to the
infinite volume limit of the original model inside the fundamental domain
of theta.\n\nhttps://conference-indico.kek.jp/event/113/contributions/219
3/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2193/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Inhomogeneous phases in the 2+1-dimensional Gross-Neveu model in t
he limit of infinite fermion flavors
DTSTART;VALUE=DATE-TIME:20200805T060000Z
DTEND;VALUE=DATE-TIME:20200805T062000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2187@conference-indico.kek.jp
DESCRIPTION:Speakers: Marc Winstel (*) (Goethe University\, Frankfurt am M
ain)\nWe explore the phase diagram of the 2+1-dimensional Gross-Neveu mode
l in the limit of infinite flavors\, which shares certain properties with
QCD\, and the existence of an inhomogeneous phase using lattice field theo
ry. Numerical results are presented\, which include the phase boundaries i
n the $\\mu$-$T$ plane as well as the structure of the chiral condensate i
n the inhomogeneous phase.\n\nhttps://conference-indico.kek.jp/event/113/c
ontributions/2187/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2187/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Simulation of complexified U(1) lattice gauge theory
DTSTART;VALUE=DATE-TIME:20200805T050000Z
DTEND;VALUE=DATE-TIME:20200805T052000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2195@conference-indico.kek.jp
DESCRIPTION:Speakers: Felix Ziegler (*) (University of Southern Denmark (S
DU))\nWe present an update on our previous studies [1] of pure U(1) latti
ce gauge theory with a sign problem due to a complex coupling \\beta. To t
hat end a novel simulation method is employed:\nConfiguration space is rew
ritten as a union of linear submanifolds in complexified space. These sub
manifolds are the tangent spaces of the Lefschetz thimble decomposition. T
herefore the sign problem is drastically reduced.\nTangent spaces are infi
nite spaces\, so we specify boundaries for them\, such that homotopy to re
al field space is in the end ensured.\nThe Monte Carlo simulation is set u
p on the tangent space corresponding to the global minimum of the action.\
nThe other spaces are taken into account by linear mappings to them\, so w
e can monitor their respective contributions one by one. The relative weig
hts are computed via reweighting.\nWe discuss simulation results including
the scaling of the sign problem with the number of tangent spaces. In par
ticular\, promising results are obtained for the beta_I / beta_R > 1 regio
n which is relevant in the context of quantum real-time simulations.\n[1]
J. M. Pawlowski\, M. Scherzer\, C. Schmidt\, F. P. G. Ziegler\, F. Ziesch
é\, „Simulating gauge theories on Lefschetz thimbles“\, \, 37th Inter
national Symposium on Lattice Field Theory\, arXiv:2001.09767 [hep-lat]\n\
nhttps://conference-indico.kek.jp/event/113/contributions/2195/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2195/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Complex Langevin analysis of four-dimensional SU(2) gauge theory w
ith a theta term
DTSTART;VALUE=DATE-TIME:20200805T054000Z
DTEND;VALUE=DATE-TIME:20200805T060000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2135@conference-indico.kek.jp
DESCRIPTION:Speakers: Akira Matsumoto (*) (SOKENDAI\, KEK)\nThe Monte Carl
o simulation of the gauge theory with a theta term is difficult due to the
sign problem. We use the complex Langevin method to overcome the problem.
In our previous work on two-dimensional U(1) gauge theory with a theta te
rm\, we were able to reproduce the exact solution by introducing a punctur
e on the torus. We also proved that the effect of the puncture disappears
in the infinite volume limit as long as |θ|\n\nhttps://conference-indico.
kek.jp/event/113/contributions/2135/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2135/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice study of rotating gluodynamics
DTSTART;VALUE=DATE-TIME:20200806T062000Z
DTEND;VALUE=DATE-TIME:20200806T064000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2073@conference-indico.kek.jp
DESCRIPTION:Speakers: Victor Braguta (JINR)\nIn this report we present the
results of lattice study of how rotation influences confinement/deconfine
ment transition in SU(3) gluodynamics. To conduct this study we pass to
the reference frame which rotates with the system under consideration. In
this reference frame rotation is accounted for by the external gravitation
al field. We calculate the Polyakov loop\, its susceptibility \nand determ
ine the critical temperature of the confinement/deconfinement transition f
or various angular velocities. We find that rotation leads to rise of the
critical temperature.\n\nhttps://conference-indico.kek.jp/event/113/contr
ibutions/2073/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2073/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sparse modeling approach to obtaining the shear viscosity from sme
ared correlation functions
DTSTART;VALUE=DATE-TIME:20200806T060000Z
DTEND;VALUE=DATE-TIME:20200806T062000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2108@conference-indico.kek.jp
DESCRIPTION:Speakers: Etsuko Itou (Keio university)\nWe propose the sparse
modeling method to estimate the spectral function from the smeared correl
ation functions. We give a description of how to obtain the shear viscosit
y from the correlation function of the renormalized energy-momentum tensor
(EMT) measured by the gradient flow method (C(t\,τ)) for the quenched QC
D at finite temperature. The measurement of the renormalized EMT in the gr
adient flow method reduces a statistical uncertainty thanks to its propert
y of the smearing. However\, the smearing breaks the sum rule of the spect
ral function and the over-smeared data in the correlation function may hav
e to be eliminated from the analyzing process of physical observables. In
this work\, we demonstrate that the sparse modeling analysis in the interm
ediate-representation basis (IR basis)\, which connects between the Matsub
ara frequency data and real frequency data. It works well even using very
limited data of C(t\,τ) only in the fiducial window of the gradient flow.
We utilize the ADMM algorithm which is useful to solve the LASSO problem
under some constraints. We show that the obtained spectral function reprod
uces the input smeared correlation function at finite flow-time. Several s
ystematic and statistical errors and the flow-time dependence are also dis
cussed.\nThis talk is based on \nhttps://arxiv.org/abs/2004.02426\n\nhttps
://conference-indico.kek.jp/event/113/contributions/2108/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2108/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Shear viscosity of classical Yang-Mills field with use of scaling
invariance
DTSTART;VALUE=DATE-TIME:20200806T054000Z
DTEND;VALUE=DATE-TIME:20200806T060000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2133@conference-indico.kek.jp
DESCRIPTION:Speakers: Hidefumi Matsuda (*) (Kyoto University)\nWe report o
n our recent results of the shear viscosity $\\eta$ of the classical Yang-
Mills (CYM) field on a lattice by using the Green-Kubo formula\, where the
shear viscosity is calculated from the time-correlation function of the e
nergy-momentum tensor in equilibrium. The point of our investigation consi
sts in utilization of the inherent scale invariance of CYM\, and thereby
the possible lattice-spacing dependence of the numerical results was circu
mvented. Thus the dependence of the shear viscosity $\\eta(g\,T)$ on the c
oupling $g$ and temperature $T$ is represented by a scaling function $f_\\
eta(g^2T)$ as $\\eta(g\,T)=Tf_\\eta(g^2T)$ due to the scaling-invariant pr
operty of the CYM. The explicit functional form of $f_\\eta(g^2T)$ is succ
essfully determined from the calculated shear viscosity: It turns out that
$\\eta(g\,T)$ of the CYM field is proportional to $1/g^{1.10-1.88}$ at we
ak coupling\, which has a weaker dependence\non $g$ than that in the leadi
ng-order perturbation theory but consistent with that of the ""anomalous v
iscosity"" $\\eta\\propto 1/g^{1.5}$ under the strong disordered field.\nT
he obtained shear viscosity is also found to be roughly consistent with th
at estimated through the analysis of the anisotropy of the pressure of the
CYM dynamics in the expanding geometry with recourse to a hydrodynamic eq
uation.\n\nhttps://conference-indico.kek.jp/event/113/contributions/2133/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2133/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gell-Mann-Oakes-Renner relation in external magnetic fields at zer
o temperature
DTSTART;VALUE=DATE-TIME:20200806T052000Z
DTEND;VALUE=DATE-TIME:20200806T054000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2182@conference-indico.kek.jp
DESCRIPTION:Speakers: Xiao-Dan Wang (*) (Central China Normal University)\
nWe present results of chiral condensates\, masses and decay constants of
neutral pseudo scalar mesons in (2+1)-flavor QCD in the presence of extern
al magnetic fields at zero temperature. We discuss the validity of Gell-Ma
nn-Oakes-Renner relation in a wide region of magnetic field strength $eB$
up to around 3.5 GeV$^2$. The simulations were performed on $32^3\\times
96$ lattices using the Highly Improved Staggered Quarks (HISQ) action with
a single lattice cutoff $a$=0.117 fm and $m_\\pi\\approx$ 220 MeV. Sixtee
n values of $eB$ along the $z$ direction up to around 3.5 GeV$^2$ have bee
n applied in the simulation.\n\nhttps://conference-indico.kek.jp/event/113
/contributions/2182/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2182/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Heavy quark diffusion coefficient from lattice QCD
DTSTART;VALUE=DATE-TIME:20200806T050000Z
DTEND;VALUE=DATE-TIME:20200806T052000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2171@conference-indico.kek.jp
DESCRIPTION:Speakers: Hai-Tao Shu (*) (Bielefeld University)\nWe show the
heavy quark diffusion coefficient calculated on the lattice. The coefficie
nt is obtained from the color-electric correlators via Kubo formula. The c
orrelators are measured at 1.5$T_c$ on different large isotropic lattices
in the quenched approximation under gradient flow. After continuum extrapo
lation we also extrapolate the continuum correlators back to zero flow tim
e. The extrapolated correlators are then fitted using theoretically motiva
ted model spectral functions. By taking the slope of the spectral function
at vanishing frequency we obtain the heavy quark diffusion coefficient. I
n this talk we will also compare our results with those from other lattice
studies.\n\nhttps://conference-indico.kek.jp/event/113/contributions/2171
/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2171/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Low-lying charmonium properties from lattice QCD + quenched QED
DTSTART;VALUE=DATE-TIME:20200806T080000Z
DTEND;VALUE=DATE-TIME:20200806T082000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2100@conference-indico.kek.jp
DESCRIPTION:Speakers: Daniel Hatton (*) (University of Glasgow)\nThe prop
erties of low-lying charmonium mesons offer points of high precision compa
rison between lattice QCD and experiment\, if discretisation effects set b
y the charm quark mass can be controlled. Using $n_f=2+1+1$ configurations
with the HISQ action\, developed by the HPQCD collaboration to have very
small discretisation errors\, we achieve precision at or below the 1% leve
l for a range of quantities. These include the hyperfine splitting\, the $
J/\\psi$ vector (and tensor) decay constants and the charm connected hadro
nic vacuum polarisation contribution to the anomalous magnetic moment of t
he muon. For the last of these we are able to obtain a result with a 0.3%
uncertainty. At this level of precision it is necessary to understand lead
ing electromagnetic effects which we do through the inclusion of quenched
QED. One such effect that must be accounted for is the electromagnetic eff
ect on the tuning of the charm mass in our calculations. The meson mass sh
ift from QED may be separated into contributions from the quark self energ
y and the physical contribution from the Coulomb potential. We extract the
Coulomb potential contribution and compare with expectations from potenti
al models.\n\nhttps://conference-indico.kek.jp/event/113/contributions/210
0/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2100/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Charmed baryon spectroscopy from lattice QCD near the physical poi
nt
DTSTART;VALUE=DATE-TIME:20200806T074000Z
DTEND;VALUE=DATE-TIME:20200806T080000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2096@conference-indico.kek.jp
DESCRIPTION:Speakers: Philipp Gubler (JAEA)\nThe low-lying spectrum of cha
rmed baryons is calculated in lattice QCD on the $32^3 \\times 64$\, $N_f
= 2 + 1$ PACS-CS gauge configurations at the almost physical pion mass of
156 $MeV/c^2$. By employing a set of interpolating operators with differen
t Dirac structures and quark-field smearings for the variational analysis\
, we extract the ground and first few excited states of the spin-1/2 and s
pin-3/2\, singly-\, doubly-\, and triply-charmed baryons.\n\nhttps://confe
rence-indico.kek.jp/event/113/contributions/2096/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2096/
END:VEVENT
BEGIN:VEVENT
SUMMARY:From QCD string breaking to quarkonium spectrum
DTSTART;VALUE=DATE-TIME:20200806T072000Z
DTEND;VALUE=DATE-TIME:20200806T074000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2080@conference-indico.kek.jp
DESCRIPTION:Speakers: Marco Catillo (*) (Ludwig Maximilian University of M
unich)\nSignal-to-noise problem and excited states contamination\, inter a
lia\, make studies of the QCD string breaking phenomenon a challenging tas
k in lattice QCD. The static quark potentials produced for these studies c
an be combined with the Born Oppenheimer approximation to give an importan
t insight into I=0 quarkonium resonances. Precise determination of various
lattice potentials are also needed for better understanding of the bound
states and hybrid mesons recently observed at LHC and other experiments. I
n this talk\, we present preliminary results on the Wilson loop correlator
s and compare smeared and unsmeared static potentials for two flavour QCD
with improved Wilson fermions. The systematic errors are reduced by solvin
g the generalised eigenvalue problem.\n\nhttps://conference-indico.kek.jp/
event/113/contributions/2080/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2080/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Magnetic Polarisability with the background Field Method
DTSTART;VALUE=DATE-TIME:20200806T070000Z
DTEND;VALUE=DATE-TIME:20200806T072000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2069@conference-indico.kek.jp
DESCRIPTION:Speakers: Ryan Bignell (*) (University of Adelaide)\nThe magne
tic polarisability is a fundamental property of hadrons\, which provides i
nsight into their structure in the low-energy regime. The pion magnetic po
larisability is calculated using lattice QCD in the presence of background
magnetic fields. The results presented are facilitated by the introductio
n of a new magnetic-field dependent quark-propagator eigenmode projector a
nd the use of the background-field corrected clover fermion action. The ma
gnetic polarisabilities are calculated in a relativistic formalism\, and t
he excellent signal-to-noise property of pion correlation functions facili
tates precise values.\n\nhttps://conference-indico.kek.jp/event/113/contri
butions/2069/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2069/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Constraints of kinematic bosonization in two and higher dimensions
DTSTART;VALUE=DATE-TIME:20200807T080000Z
DTEND;VALUE=DATE-TIME:20200807T082000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2190@conference-indico.kek.jp
DESCRIPTION:Speakers: Jacek Wosiek (Jagiellonian University)\nContrary to
the common wisdom\, local bosonizations of fermionic systems exist in high
er dimensions. Interestingly\, resulting bosonic variables must satisfy lo
cal constraints of a gauge type. They effectively replace long distance ex
change interactions. In this work we study in detail the properties of suc
h a system which was proposed a long time ago. In particular\, dependence
of the constraints on lattice geometry and fermion multiplicity is further
elaborated and is now classified for all two dimensional\, rectangular la
ttices with arbitrary sizes. For few small systems the constraints are sol
ved analytically and the complete spectra of reduced spin hamiltonias are
shown to agree with the original fermionic ones. The equivalence is also e
xtended to fermions in an external Wegner Z2 field. It is also illustrated
by an explicit calculation for a particular configuration of Wegner varia
bles.\n\nhttps://conference-indico.kek.jp/event/113/contributions/2190/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2190/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gamma model - bosonization and gauge theory interpretation
DTSTART;VALUE=DATE-TIME:20200807T082000Z
DTEND;VALUE=DATE-TIME:20200807T084000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2164@conference-indico.kek.jp
DESCRIPTION:Speakers: Blazej Ruba (*) (Jagiellonian University in Cracow)\
nThis talk is about a bosonization procedure based on Clifford algebra-val
ued degrees of freedom\, valid for spaces of any dimension. Its interpreta
tion in terms of lattice Z_2 gauge theory will be presented. Brief compari
son with other bosonization proposals will be given.\n\nhttps://conference
-indico.kek.jp/event/113/contributions/2164/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2164/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Resurgence structure on compactified spacetime with twisted bounda
ry condition
DTSTART;VALUE=DATE-TIME:20200807T074000Z
DTEND;VALUE=DATE-TIME:20200807T080000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2141@conference-indico.kek.jp
DESCRIPTION:Speakers: Okuto Morikawa (*) (Kyushu University)\nRecently\, i
n the context of the resurgence program\, it was conjectured that the pert
urbative ambiguity caused by the IR renormalon is canceled against the sem
i-classical object called bion. This conjecture requires the circle compac
tification with the $Z_N$ twisted boundary condition\, in which the bion s
olution is found. Contrary to this conjecture\, we find that there is no I
R renormalon in circle-compactified theories. We then argue that the bion
cancels the perturbative ambiguity caused by the proliferation of Feynman
diagrams\, which are significantly affected by the compactification. These
observations are helpful in giving a unified understanding on the resurge
nce structure.\n\nhttps://conference-indico.kek.jp/event/113/contributions
/2141/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2141/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A physicist-friendly reformulation of the mod-two Atiyah-Patodi-Si
nger index
DTSTART;VALUE=DATE-TIME:20200807T072000Z
DTEND;VALUE=DATE-TIME:20200807T074000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2134@conference-indico.kek.jp
DESCRIPTION:Speakers: Yoshiyuki Matsuki (*) (Osaka University)\nGauge anom
aly in 4-dimensions can be viewed as a current inflow into an extra-dimens
ion\, where the total phase of the fermion partition function is given in
a gauge invariant way by the Atiyah-Patodi-Singer(APS) eta-invariant of a
5-dimensional Dirac operator. However\, this formalism requires a non-loca
l boundary condition\, which makes the physical roles of edge/bulk modes u
nclear and the causality of the total theory doubtful. In this talk\, we c
onsider a special case where the Dirac operator is in a real representatio
n and its eta invariant becomes the mod-two type APS index. We propose a p
hysicist-friendly reformulation of the mod-two index using domain-wall fer
mion formalism\, which naturally describes how the global anomaly is cance
led between edge and bulk.\n\nhttps://conference-indico.kek.jp/event/113/c
ontributions/2134/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2134/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Simplical Lattice Field Theory on de Sitter and anti de Sitter Man
ifolds
DTSTART;VALUE=DATE-TIME:20200807T070000Z
DTEND;VALUE=DATE-TIME:20200807T072000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2074@conference-indico.kek.jp
DESCRIPTION:Speakers: Richard Brower (Boston University)\nThe generalizati
on of Lattice Field Theory targeting in curved Riemann manifolds referred
to as Quantum Finite Elements (QFE) requires geometrical tools.\nA brief
outline for the construction of a Simplicial Complex and\nits Delaunay du
al\, the construction Finite Element of lattice action based on\nthe elega
nt Discrete Exterior Calculus (DEC) is given. The focus in on spheres and
hyperbolic manifolds suited to radial quantization of conformal field theo
ry and\nthe AdS/CFT correspondence respectively. The formalism aims to co
nstruct simlicial\nactons for scalar\, Dirac and non-Abelian fields.\n\nht
tps://conference-indico.kek.jp/event/113/contributions/2074/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2074/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tensor renormalization group approach to four-dimensional complex
\\phi^4 theory at finite density
DTSTART;VALUE=DATE-TIME:20200807T062000Z
DTEND;VALUE=DATE-TIME:20200807T064000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2061@conference-indico.kek.jp
DESCRIPTION:Speakers: Shinichiro Akiyama (*) (University of Tsukuba)\nTens
or network is an attractive approach to field theory with \nnegative sign
problem. The complex \\phi^4 theory at finite density is a test bed for nu
merical algorithms to verify their effectiveness.\nThe model shows a chara
cteristic feature called the Silver Blaze phenomenon associated with the s
ign problem in the large volume limit at low temperature. We analyze the f
our-dimensional model employing the anisotropic tensor renormalization gr
oup algorithm. We find a clear signal of the Silver Blaze phenomenon on a
large volume of V=1024^4\, which implies that the tensor network approach
is effective even for four-dimensional field theory beyond two dimensions.
\n\nhttps://conference-indico.kek.jp/event/113/contributions/2061/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2061/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On the ratio between scalar and tensor glueball masses in Yang-Mil
ls theories
DTSTART;VALUE=DATE-TIME:20200807T060000Z
DTEND;VALUE=DATE-TIME:20200807T062000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2179@conference-indico.kek.jp
DESCRIPTION:Speakers: Davide Vadacchino (*) (Trinity College Dublin)\nWe s
uggest that in Yang-Mills theories the ratio R of the mass of the tensor g
lueball over the mass of the scalar glueball is a universal quantity that
depends only on the dimensionality of the space. To support this conjectur
e\, we compute numerically R for Sp(2N) gauge theories for N = 1\, 2\, 3\,
4 in d=4 Euclidean dimensions on a lattice and we analyse our results tog
ether with previous lattice studies of other Yang-Mills theories\, in both
d=4 and d=3. We then compare our findings to various analytic models in w
hich R can be computed explicitly in the large N limit.. Finally\, we sho
w that a constant R might emerge in a context in which scale invariance is
broken\, giving rise to a light dilaton state that can be interpreted as
the lowest-lying scalar glueball. Our results provide further insights tow
ards our understanding of confinement in QCD\n\nhttps://conference-indico.
kek.jp/event/113/contributions/2179/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2179/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Target space defects and anisotropic gauge theories
DTSTART;VALUE=DATE-TIME:20200807T054000Z
DTEND;VALUE=DATE-TIME:20200807T060000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2147@conference-indico.kek.jp
DESCRIPTION:Speakers: Stam Nicolis (Institut Denis Poisson (CNRS UMR7013))
\nWe study the defects that can be defined within the framework of lattice
gauge theories\, in the presence of anisotropic couplings and try to ide
ntify their target space avatars. These are relevant for describing topolo
gical insulators.\n\nhttps://conference-indico.kek.jp/event/113/contributi
ons/2147/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2147/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Casimir energy for the domain-wall fermion
DTSTART;VALUE=DATE-TIME:20200807T052000Z
DTEND;VALUE=DATE-TIME:20200807T054000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2145@conference-indico.kek.jp
DESCRIPTION:Speakers: Katsumasa Nakayama (*) (DESY)\nWe investigate Casimi
r energy for free fermions on the lattice.\nThe Casimir energy of fermion
fields can be defined with the lattice regularization.\nThe continuum extr
apolation of our results reproduces the Casimir energy known in continuum
theory.\nWe also show the lattice effect for the Casimir energy.\nThe latt
ice effect is important as an artifact that should be well-understood in o
rder to perform reliable lattice simulations with a small volume in partic
le physics.\nOn the other hand\, the lattice effects can appear in materia
ls such as topological insulators in condensed matter physics\, and it can
be detected in experiments.\nWe discuss a typical behavior near the phase
-transition of the domain-wall fermion.\n\nhttps://conference-indico.kek.j
p/event/113/contributions/2145/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2145/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Conformal magnetic effect in scalar QED
DTSTART;VALUE=DATE-TIME:20200807T050000Z
DTEND;VALUE=DATE-TIME:20200807T052000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2083@conference-indico.kek.jp
DESCRIPTION:Speakers: Maxim Chernodub (Institut Denis Poisson\, CNRS)\nQua
ntum polarization effects associated with the conformal anomaly in a stati
c magnetic field background may generate a transverse electric current in
the vacuum of massless particles (either bosons or fermions). The current
may be produced either in an unbounded curved spacetime or in flat spaceti
me in a physically bounded system. In both cases\, the magnitude of the el
ectric current is proportional to the beta-function associated with the re
normalization of electric charge. We investigate the electric current dens
ity induced by the magnetic field in the vicinity of a Dirichlet boundary
in lattice scalar QED. We show that the electric current\, generated by th
is "conformal magnetic effect at the edge" (CMEE)\, is well described by t
he conformal anomaly in the symmetry--unbroken phase. In the symmetry--bro
ken phase\, the anomalous current becomes the usual Meissner current gener
ated by the superconducting condensate.\n\nhttps://conference-indico.kek.j
p/event/113/contributions/2083/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2083/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thermal field theory with pure states
DTSTART;VALUE=DATE-TIME:20200806T082000Z
DTEND;VALUE=DATE-TIME:20200806T084000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2175@conference-indico.kek.jp
DESCRIPTION:Speakers: Akio Tomiya (*) (Riken/BNL)\nRecently\, many studies
of quantum field theory with quantum computers have reported. Quantum cal
culation can only treat unitary evolution\, so thermal physics is one of d
ifficulty of it because one needs to produce mixed states within allowed o
perations. Towards resolving the problem\, we attempt to investigate therm
al physics with thermal pure quantum(TPQ) state formalism. TPQ state forma
lism enables us to calculate the thermal average without mixed states. In
the talk\, we report progress on the application of TPQ state formalism to
quantum field theory.\n\nhttps://conference-indico.kek.jp/event/113/contr
ibutions/2175/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2175/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Relativistic N particle energy shifts in finite volume
DTSTART;VALUE=DATE-TIME:20200806T080000Z
DTEND;VALUE=DATE-TIME:20200806T082000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2167@conference-indico.kek.jp
DESCRIPTION:Speakers: Nikolas Schlage (*) (University Bonn)\nUsing a non-r
elativistic EFT\, we derive a general relativistic expression for the ener
gy shift in finite volume. This includes the N-particle ground state\, and
the first two- and three-particle excited states. In addition\, we probe
the N particle energy shift formula in complex phi^4 theory. We investigat
e different fit models\, that include relativistic effects\, exponentially
suppressed corrections and perturbation-theory inspired ansätze. We disc
uss the challenges to reliably obtain the three-body scattering amplitude.
\n\nhttps://conference-indico.kek.jp/event/113/contributions/2167/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2167/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Connecting Matrix Elements to Multi-Hadron Form-Factors
DTSTART;VALUE=DATE-TIME:20200806T074000Z
DTEND;VALUE=DATE-TIME:20200806T080000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2109@conference-indico.kek.jp
DESCRIPTION:Speakers: Andrew Jackura (*) (Old Dominion University and Jeff
erson Lab)\nWe review developments in calculating multi-hadron form-factor
s and transition processes via lattice QCD. Our primary tools are finite-v
olume scaling relations\, which non-perturbatively map spectra and matrix
elements to their corresponding infinite-volume amplitudes. We focus on tw
o hadron processes probed by an external current\, and provide various che
cks on the finite-volume formalism in the limiting cases of perturbative i
nteractions and systems forming a bound state. Additionally\, we study mod
el-independent properties of their corresponding infinite-volume amplitude
s\, allowing us to rigorously define form-factors of resonating systems an
d amplitudes useful for BSM physics.\n\nhttps://conference-indico.kek.jp/e
vent/113/contributions/2109/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2109/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Maiani-Testa meets the inverse problem
DTSTART;VALUE=DATE-TIME:20200806T072000Z
DTEND;VALUE=DATE-TIME:20200806T074000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2075@conference-indico.kek.jp
DESCRIPTION:Speakers: Mattia Bruno (CERN)\nIn their seminal publication of
1990\, Maiani and Testa showed that Euclidean correlators are contaminate
d by off-shell contributions\, limiting a direct extraction of amplitudes
away from threshold. In this presentation\, we revisit and extend this wor
k\, and explore the connection with recent developments on the inverse pro
blem in Lattice QCD.\n\nhttps://conference-indico.kek.jp/event/113/contrib
utions/2075/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2075/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Role of Boundary Conditions in Quantum Computations of Scatter
ing Observables
DTSTART;VALUE=DATE-TIME:20200806T070000Z
DTEND;VALUE=DATE-TIME:20200806T072000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2172@conference-indico.kek.jp
DESCRIPTION:Speakers: Alexandru Sturzu (*) (New College of Florida)\nQuant
um computing may offer the opportunity to simulate strongly-interacting fi
eld theories\, such as quantum chromodynamics\, with physical time evoluti
on. This would give access to Minkowski signature correlators\, in contras
t to the Euclidean calculations routinely performed at present. However\,
as with present-day calculations\, quantum computation strategies still re
quire the restriction to a finite system size\, including a finite\, usual
ly periodic\, spatial volume. In this work\, we investigate the consequenc
es of this in the extraction of hadronic and Compton-like scattering ampli
tudes. Using the framework presented in Phys. Rev. D101 014509 (2020)\, we
quantify the volume effects for various 1 + 1D Minkowski-signature quanti
ties and show that these can be a significant source of systematic uncerta
inty\, even for volumes that are very large by the standards of presentday
Euclidean calculations. We then present an improvement strategy\, based i
n the fact that the finite volume has a reduced symmetry. This implies tha
t kinematic points\, which yield the same Lorentz invariants\, may still b
e physically distinct in the finite-volume system. As we demonstrate\, bot
h numerically and analytically\, averaging over such sets can significantl
y suppress the unwanted volume distortions and improve the extraction of t
he physical scattering amplitudes.\n\nhttps://conference-indico.kek.jp/eve
nt/113/contributions/2172/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2172/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Noise-robust Implementation of Gauss's law for quantum computers
DTSTART;VALUE=DATE-TIME:20200806T062000Z
DTEND;VALUE=DATE-TIME:20200806T064000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2138@conference-indico.kek.jp
DESCRIPTION:Speakers: Yannick Meurice (University of iowa)\nWe discuss con
tinuous symmetries identities using the tensor formulation of lattice spin
and gauge models. We show that the symmetries are encoded in the selectio
n rules of the tensor. This allows truncations that preserve the symmetrie
s exactly. We present the tensorial expression of the transfer matrix for
Abelian gauge theories and explain how gauge fixing and Gauss's law relat
e. \nWe propose redefinitions of the electric quantum numbers such that Ga
uss's law is always satisfied even when the time evolution is implemented
on NISQ devices. We discuss ways to minimize the number of degrees of free
dom. \nWe briefly discuss practical implementations for a Z2 gauge theory.
\nThis follows arXiv:2003.10986 (Phys. Rev. D in press) and Phys. Rev. D
100\, 014506\n\nhttps://conference-indico.kek.jp/event/113/contributions/2
138/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2138/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gluon Field Digitization for Quantum Computers
DTSTART;VALUE=DATE-TIME:20200806T060000Z
DTEND;VALUE=DATE-TIME:20200806T062000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2123@conference-indico.kek.jp
DESCRIPTION:Speakers: Henry Lamm (*) (Fermilab)\nThe efficient digitizatio
n required for the quantum simulations of QCD can be obtained by approxima
ting continuous SU(3) gluon fields by discrete subgroups. In this talk\, w
e discuss on-going efforts to develop this program of digitization: derivi
ng improved discrete group lattice actions\, classical simulations for qua
ntifying systematic errors\, and implementable circuits for digital quantu
m computers.\n\nhttps://conference-indico.kek.jp/event/113/contributions/2
123/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2123/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Digital Quantum Simulation of the Schwinger Model with Theta Term
via Adiabatic State Preparation
DTSTART;VALUE=DATE-TIME:20200806T054000Z
DTEND;VALUE=DATE-TIME:20200806T060000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2104@conference-indico.kek.jp
DESCRIPTION:Speakers: Masazumi Honda (Yukawa Institute for Theoretical Phy
sics)\nWe perform a digital quantum simulation of the Schwinger model with
the theta term\, which is practically inaccessible by standard lattice Mo
nte Carlo simulations. We construct the true vacuum state of a lattice Sch
winger model using adiabatic state preparation which\, in turn\, allows us
to compute an expectation value of the fermion mass operator with respect
to the vacuum. Upon taking a continuum limit we find that our result in m
assless case agrees with the known exact result. In massive case\, we find
an agreement with mass perturbation theory in small mass regime and devia
tions in large mass regime. We estimate computational costs required to ta
ke a reasonable continuum limit.\n\nhttps://conference-indico.kek.jp/event
/113/contributions/2104/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2104/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alternatives to Kogut-Susskind formulation for quantum computation
DTSTART;VALUE=DATE-TIME:20200806T052000Z
DTEND;VALUE=DATE-TIME:20200806T054000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2097@conference-indico.kek.jp
DESCRIPTION:Speakers: Masanori Hanada (Surrey)\nWhen the realizations of Q
FT on quantum computer are discussed\, the Kogut-Susskind formulation of l
attice Hamiltonian is a popular option. We provide alternative formulation
s and discuss the pros and cons.\n\nhttps://conference-indico.kek.jp/event
/113/contributions/2097/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2097/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Radial Lattice Quantization of 3D $\\phi^4$ Field Theory
DTSTART;VALUE=DATE-TIME:20200806T050000Z
DTEND;VALUE=DATE-TIME:20200806T052000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2093@conference-indico.kek.jp
DESCRIPTION:Speakers: Andrew Gasbarro (*) (University of Bern)\nWe present
numerical results for 3d $\\phi^4$ field theory on the $R\\times S^2$ man
ifold in radial quantization using the quantum extension of the finite ele
ment method (QFE). The Monte Carlo study supports the QFE ansatz that once
counterterms cancel effects from geometric defects in the UV\, one reache
s the nonperturbative conformal fixed point of the 3d Ising CFT. We demons
trate that including the Ricci curvature term for an improved lattice acti
on drastically accelerates the approach to the continuum limit\, opening t
he way for high precision calculation of scaling dimensions\, OPE coupling
s\, and the central charge.\n\nhttps://conference-indico.kek.jp/event/113/
contributions/2093/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2093/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gluon gravitational form factors for hadrons of different spins
DTSTART;VALUE=DATE-TIME:20200805T084000Z
DTEND;VALUE=DATE-TIME:20200805T090000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2154@conference-indico.kek.jp
DESCRIPTION:Speakers: Dimitra Pefkou (*) (MIT)\nWe extract structure funct
ions corresponding to the first moment of the gluon GPDs from the matrix e
lements of the gluon energy momentum tensor on a clover ensemble with m_{\
\pi} = 450 MeV. We present the various GFFs for states of different spins
with a focus on the D-terms. We then compare extracted physical quantities
like the pressure and shear forces between the different hadrons.\n\nhttp
s://conference-indico.kek.jp/event/113/contributions/2154/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2154/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Semileptonic $B\\to\\pi\\ell\\nu$ decays
DTSTART;VALUE=DATE-TIME:20200805T084000Z
DTEND;VALUE=DATE-TIME:20200805T090000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2101@conference-indico.kek.jp
DESCRIPTION:Speakers: Ryan Hill (*) (University of Southampton)\nThe desir
e for additional determinations of the CKM matrix element $V_{ub}$ and a l
ong-standing 2-3$\\sigma$ discrepancy between results from inclusive $B\\t
o X_u$ and exclusive $B\\to\\pi$ processes motivate the study of $B\\to\\p
i$ semileptonic form factors on the lattice. The status of our preliminary
$B\\to\\pi\\ell\\nu$ results will be discussed by highlighting updates to
our analysis. The analysis is carried out on a subset of the RBC/UKQCD 2+
1f Iwasaki gauge action ensembles\, with $b$ quarks simulated using the Co
lumbia formulation of the relativistic heavy quark action\, and the light
valence-quarks simulated with domain wall fermions. The final results of t
his project will provide updates to the 2015 RBC/UKQCD $B\\to\\pi\\ell\\nu
$ result.\n\nhttps://conference-indico.kek.jp/event/113/contributions/2101
/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2101/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Heavy to strange semileptonic decays
DTSTART;VALUE=DATE-TIME:20200805T082000Z
DTEND;VALUE=DATE-TIME:20200805T084000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2152@conference-indico.kek.jp
DESCRIPTION:Speakers: William Parrott (University of Glasgow)\n"D → Klν
and B → Kl + l − are important heavy to strange semileptonic decay pr
ocesses\, giving us direct comparison with experiment\, and access to CKM
\nmatrix elements and potential new physics. We can calculate form factors
for \nboth of these processes in lattice QCD and connect them together by
determining heavy to strange form factors for heavy quark masses ranging
from c to b. We can also explore the connection to form factors with diffe
rent light quark masses. Using the HISQ action on N f = 2 + 1 + 1\, we dem
onstrate how D → K calculations can be extended up towards the b by a st
udy of heavy-strange to η_s form factors\, including tests of the depende
nce on heavy quark mass\, comparing to HQET expectations. We also give pre
liminary D → K and B → K results\, for the latter including results fo
r the tensor form factor with an accurately renormalised tensor current."\
n\nhttps://conference-indico.kek.jp/event/113/contributions/2152/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2152/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$B_c \\rightarrow J/\\psi$ Semileptonic Form Factors and $R(J/\\ps
i)$ Using the Heavy-HISQ Method
DTSTART;VALUE=DATE-TIME:20200805T080000Z
DTEND;VALUE=DATE-TIME:20200805T082000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2098@conference-indico.kek.jp
DESCRIPTION:Speakers: Judd Harrison (*) (University of Glasgow)\nWe presen
t the results of HPQCD's recent calculation of the $B_c \\rightarrow J/\\p
si$ semileptonic form factors and $R(J/\\psi)$ for the first time from lat
tice QCD using the heavy-HISQ method. We also extend these results to angu
lar observables which we compute in the standard model and in several new
physics scenarios.\n\nhttps://conference-indico.kek.jp/event/113/contribut
ions/2098/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2098/
END:VEVENT
BEGIN:VEVENT
SUMMARY:B->D(*)\\ell\\nu form factors from relativistic lattice QCD
DTSTART;VALUE=DATE-TIME:20200805T074000Z
DTEND;VALUE=DATE-TIME:20200805T080000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2113@conference-indico.kek.jp
DESCRIPTION:Speakers: Takashi KANEKO (KEK)\nWe report on our calculation o
f the B->D(*)\\ell\\nu form factors in 2+1 flavor relativistic lattice QCD
. Our simulations are carried out by employing the M\\""obius domain-wall
quark action at lattice cut-offs a^{-1} \\sim 2.4\, 3.6 and 4.5 GeV with t
he bottom quark masses up to 0.7 a^{-1}. We discuss the extrapolation of t
he form factors to the continuum limit and physical quark masses.\n\nhttps
://conference-indico.kek.jp/event/113/contributions/2113/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2113/
END:VEVENT
BEGIN:VEVENT
SUMMARY:D to K semileptonic decay from n_f = 2 + 1 + 1 lattice QCD with ph
ysical light quarks
DTSTART;VALUE=DATE-TIME:20200805T072000Z
DTEND;VALUE=DATE-TIME:20200805T074000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2081@conference-indico.kek.jp
DESCRIPTION:Speakers: Bipasha Chakraborty (*) (University of Cambridge)\nW
e present our (HPQCD) latest lattice QCD calculation of the scalar and the
vector form factors for the D → Klν semi-leptonic decay over a full ra
nge of q^2 including q^2 = 0. This calculation has been performed on the N
_f=2+1+1 MILC HISQ ensembles with the physical and heavier than physical l
ight quark masses.This calculation allows us to precisely determine the ce
ntral CKM matrix element\, V_{cs} in the Standard Model\, by comparing the
lattice QCD results for the form factors and the experimental decay rate.
\n\nhttps://conference-indico.kek.jp/event/113/contributions/2081/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2081/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Semileptonic $B_s \\to K$ and $B_s \\to D_s$ decays
DTSTART;VALUE=DATE-TIME:20200805T070000Z
DTEND;VALUE=DATE-TIME:20200805T072000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2176@conference-indico.kek.jp
DESCRIPTION:Speakers: J Tobias Tsang (*) (University of Southern Denmark\,
CP3)\nWe present our results for the semileptonic formfactors of exclusiv
e $B_s \\to K \\ell \\nu$ and $B_s \\to D_s \\ell \\nu$ decays. The calcul
ation is based on RBC/UKQCD's set of 2+1 dynamical flavour gauge field ens
embles spanning three lattice spacings. We use domain wall fermions for th
e valence up/down\, strange and charm quarks whilst the bottom quark is si
mulated using the relativistic heavy quark action. After presenting the ex
trapolation to zero lattice spacing and physical quark masses we show our
complete error budget and kinematic extrapolations over the entire $q^2$ r
ange.\nUsing our results we predict ratios which serve as tests of lepton
flavour universality. These form factors can be combined with experimental
data (where available) to extract the CKM matrix elements $V_{ub}$ and $V
_{cb}$\, complimentary to extractions from $B \\to \\pi \\ell \\nu$ and $B
\\to D \\ell \\nu$.\n\nhttps://conference-indico.kek.jp/event/113/contrib
utions/2176/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2176/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Exploring the ’t Hooft limit of meson observables
DTSTART;VALUE=DATE-TIME:20200805T062000Z
DTEND;VALUE=DATE-TIME:20200805T064000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2163@conference-indico.kek.jp
DESCRIPTION:Speakers: Fernando Romero-Lopez (*) (University of Valencia)\n
The 't Hooft limit of QCD\, also referred to as large Nc limit\, constitut
es a simplification of the theory that preserves most of its non-perturbat
ive properties\, including confinement and spontaneous chiral symmetry bre
aking. It also leads to some definite predictions such as a non-existing D
elta I=1/2 rule in the K-> pi pi isospin decay amplitudes. Many phenomenol
ogical approaches to hadron physics employ approximations inspired by this
limit\, even for quantities such as the former\, where the large Nc predi
ction is off. In this talk\, I will present our recent lattice results for
some relevant observables for light meson physics\, such as meson mases a
nd decay constants\, nonleptonic kaon decay amplitudes\, and scattering am
plitudes.\n\nhttps://conference-indico.kek.jp/event/113/contributions/2163
/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2163/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$B_{(s)}-\\bar{B}_{(s)}$ mixing on domain-wall lattices
DTSTART;VALUE=DATE-TIME:20200805T060000Z
DTEND;VALUE=DATE-TIME:20200805T062000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2088@conference-indico.kek.jp
DESCRIPTION:Speakers: Felix Erben (*) (University of Edinburgh)\nWe are pr
esenting our ongoing Lattice QCD study on $B-\\bar{B}$ mixing. Comparing a
variety of different methods\, we are extracting bag parameters $B_{B_{s}
}$ and $B_{B_{d}}$ on several RBC/UKQCD and JLQCD ensembles with 2+1 dynam
ical-flavour domain wall fermions\, including physical-pion-mass ensembles
. We are simulating a range of heavy quark masses on each ensemble from be
low the charm quark mass towards (but still below) the bottom quark mass.
The plan for this study is to perform a full continuum limit allowing us t
o get an independent determination of the CKM matrix elements $|V_{ts}|$ a
nd $|V{td}|$\, which will help to test whether the CKM matrix is indeed un
itary.\n\nhttps://conference-indico.kek.jp/event/113/contributions/2088/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2088/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Neutral $B$ and $B_s$ mixing matrix elements using NRQCD and the M
ILC HISQ ensembles
DTSTART;VALUE=DATE-TIME:20200805T054000Z
DTEND;VALUE=DATE-TIME:20200805T060000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2186@conference-indico.kek.jp
DESCRIPTION:Speakers: Matthew Wingate (University of Cambridge)\nIn this t
alk I will briefly review our recent lattice calculations for matrix eleme
nts contributing to the mass and width differences of neutral $B$ mesons [
arXiv:1907.01025\, arXiv:1910.00970]. The calculations were done using the
MILC ensembles generated with 4-flavours of sea quarks utilizing the high
ly improved staggered quark action. An improved nonrelativistic quark acti
on was used for the bottom quark. Consequences of these calculations incl
ude determinations of the CKM matrix elements $|V_{td}|$ and $|V_{ts}|$\,
predictions for the rare branching fractions $B_{d\,s} \\to \\mu^+ \\mu^-$
\, and an improved Standard Model determinations for $\\Delta \\Gamma_s$.\
n\nhttps://conference-indico.kek.jp/event/113/contributions/2186/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2186/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Long-distance contribution to neutrinoless double beta decays in p
ion sector
DTSTART;VALUE=DATE-TIME:20200805T052000Z
DTEND;VALUE=DATE-TIME:20200805T054000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2178@conference-indico.kek.jp
DESCRIPTION:Speakers: Xin-yu Tuo (*) (Peking university)\nNeutrinoless dou
ble beta decay\, if detected\, would prove that neutrinos are Majorana fer
mions and provide the direct evidence for lepton number violation. If such
decay would exist in nature\, then π−π− → ee and π− → π+ee
(or equivalently π−e+ → π+e−) are the two simplest processes acces
sible via first-principle lattice QCD calculations. In this work\, we calc
ulate the long-distance contributions to the π\n− → π+ee transition
amplitude using four ensembles at the physical pion mass with various volu
mes and lattice spacings. We adopt the infinite-volume reconstruction meth
od to control the finite-volume effects arising from the (almost) massless
neutrino. Providing the lattice QCD inputs for chiral perturbation theory
\, we obtain the low energy constant gππv(mρ) =−10.89(28)stat(74)sys\
, which is close to gππv(mρ) = −11.96(31)stat determined from the cro
ssed channel π−π− → ee decay.\n\nhttps://conference-indico.kek.jp/
event/113/contributions/2178/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2178/
END:VEVENT
BEGIN:VEVENT
SUMMARY:First-principles calculation of electroweak box diagrams from latt
ice QCD
DTSTART;VALUE=DATE-TIME:20200805T050000Z
DTEND;VALUE=DATE-TIME:20200805T052000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2132@conference-indico.kek.jp
DESCRIPTION:Speakers: Pengxiang Ma (*) (Peking University)\nWe present the
first realistic lattice QCD calculation of the γW-box diagrams relevant
for beta decays. The nonperturbative low-momentum integral of the γW loop
is calculated using a lattice QCD simulation\, complemented by the pertur
bative QCD result at high momenta. Using the pion semileptonic decay as an
example\, we demonstrate the feasibility of the method. By using domain w
all fermions at the physical pion mass with multiple lattice spacings and
volumes\, we obtain the axial γW-box correction to the semileptonic pion
decay\, □γWVA|π=2.830(11)stat(26)sys×10−3\, with the total uncertai
nty controlled at the level of ∼1%. This study sheds light on the first-
principles computation of the γW-box correction to the neutron decay\, wh
ich plays a decisive role in the determination of |Vud|.\n\nhttps://confer
ence-indico.kek.jp/event/113/contributions/2132/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2132/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice QCD propagators\, Padé Approximants and Analytic structur
e
DTSTART;VALUE=DATE-TIME:20200806T084000Z
DTEND;VALUE=DATE-TIME:20200806T090000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2150@conference-indico.kek.jp
DESCRIPTION:Speakers: Orlando Oliveira (University of Coimbra\, Portugal)\
nAn analysis of the lattice Landau gauge gluon and ghost propagators for p
ure Yang-Mills is performed using Padé approximants to compute their anal
ytical structure. The gluon propagator is described by a pair of complex c
onjugate poles and a branch cut along the negative side of the Euclidean m
omenta. The ghost propagator revels a simple pole at zero momenta and the
method identifies a branch cut that does not start at the origin. We discu
ss the implications of our finds and compare them to the published literat
ure.\n\nhttps://conference-indico.kek.jp/event/113/contributions/2150/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2150/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Violation of non-Abelian Bianchi identity and color confinement in
QCD
DTSTART;VALUE=DATE-TIME:20200806T074000Z
DTEND;VALUE=DATE-TIME:20200806T080000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2174@conference-indico.kek.jp
DESCRIPTION:Speakers: Tsuneo Suzuki (Research Center for Nuclear Physics\,
Osaka University)\nA new scheme for color confinement in QCD due to viola
tion of non-Abelian Bianchi identity (VNABI) is proposed and numerical res
ults in pure SU2 and SU3 QCD supporting the scheme are shown.\n\nhttps://
conference-indico.kek.jp/event/113/contributions/2174/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2174/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The dual Meissner effect due to the violation of non-Abelian Bianc
hi identity
DTSTART;VALUE=DATE-TIME:20200806T082000Z
DTEND;VALUE=DATE-TIME:20200806T084000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2102@conference-indico.kek.jp
DESCRIPTION:Speakers: Atsuki Hiraguchi (*) (Kochi University)\nQuark confi
nement is still an unsolved problem. The dual Meissner effect is one of th
e ideas of this mechanism. In this picture\, it is considered that the col
or flux tube between quarks is caused by the condensation of monopole in t
he QCD vacuum. However\, how to define monopole in QCD is a difficult prob
lem. Recently\, it was shown the violation of non-Abelian Bianchi identity
is equal to Abelian-like monopole currents. In this talk\, we show numeri
cal results of the dual Meissner effect due to these monopole currents.\n\
nhttps://conference-indico.kek.jp/event/113/contributions/2102/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2102/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A non-perturbative renormalization scheme with the gradient flow
DTSTART;VALUE=DATE-TIME:20200806T062000Z
DTEND;VALUE=DATE-TIME:20200806T064000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2161@conference-indico.kek.jp
DESCRIPTION:Speakers: Matthew Rizik (*) (National Superconducting Cyclotro
n Laboratory\, Michigan State University)\nThe range of energy scales norm
ally accessible by large-volume lattice computations is typically fairly l
imited\n($1/a simeq 1-4$ GeV) and potentially insufficient to reproduce hi
gh-energy perturbative results.\nIn order to match lattice results with mo
re phenomenologically amenable schemes\, such as the $\\bar{MS}$ scheme\,
we must evolve the non-perturbative results to higher energies where match
ing with perturbation theory is possible.\nWe thereupon present a method t
o determine both the renormalization constants and anomalous dimensions fo
r local operators by studying ratios and double ratios of correlation func
tions both in continuum perturbation theory and on the lattice. In particu
lar\, we employ the Yang-Mills\n(Wilson) gradient flow to parametrize the
renormalization scale.\nThis has two major benefits. On the lattice\, the
introduction of the flow time fixes the energy scale\, which permits a con
tinuum limit free from power divergences in the lattice spacing due to ope
rator mixing.\nFurther\, while the gradient flow slightly complicates pert
urbation theory\, it has been shown that all gauge fields in the bulk are
intrinsically renormalized.\nFocusing on massless fermion bilinears\, we s
tudy correlation functions at positive flow time at leading and next-to-le
ading order in perturbation theory with $\\bar{MS}$ subtraction. Through r
enormalization group equations\, it is possible to match these correlators
to lattice data at the hadronic scale\,\nwith the goal of identifying an
energy regime within which both agree.\n\nhttps://conference-indico.kek.jp
/event/113/contributions/2161/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2161/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QCD sum rule from lattice correlators
DTSTART;VALUE=DATE-TIME:20200806T060000Z
DTEND;VALUE=DATE-TIME:20200806T062000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2107@conference-indico.kek.jp
DESCRIPTION:Speakers: Tsutomu Ishikawa (*) (KEK\, SOKENDAI)\nWe propose a
method to compute a spectral sum appearing in the QCD sum rule from lattic
e correlators. \nThis spectral sum corresponds to the Borel transform of t
he vacuum polarization\, which widely appears in the phenomenological stud
y. \nWe discuss how to compute it from two-point correlation functions on
the lattice. \nWe measure it for three lattice spacing and confirm that th
e method gives results consistent with operator product expansion.\n\nhttp
s://conference-indico.kek.jp/event/113/contributions/2107/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2107/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Renormalisation of quark and gluon operators using Feynman-Hellman
n
DTSTART;VALUE=DATE-TIME:20200806T054000Z
DTEND;VALUE=DATE-TIME:20200806T060000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2105@conference-indico.kek.jp
DESCRIPTION:Speakers: Tomas Howson (*) (University of Adelaide)\nThe decom
position of energy and momentum in the hadron in terms of quark and gluon
constituents is of fundamental importance to hadron structure\, and with t
he ongoing development of the future Electron-Ion Collider\, there is trem
endous interest in imaging the transverse distributions of these constitue
nts. This program will be strengthened by complimentary studies in Lattice
QCD\, where a renormalisation of the lattice operators is necessary to co
nnect the calculated distributions to the corresponding phenomenological q
uantities reported in a familiar renormalisation scheme\, such as MS-bar.
In such a renormalisation scheme\, the quark and gluon operators mix under
renormalisation. In literature it has been common to obtain the off-diago
nal renormalisation factors through perturbation theory. However\, for con
sistency\, a fully non-perturbative renormalisation scheme that computes a
ll components of the renormalisation matrix is desired. We will demonstrat
e an RI-MOM renormalisation scheme that includes mixed quark and gluon amp
utated vertex functions\, to directly compute the mixing renormalisation f
actors. The method utilised exploits Feynman-Hellmann techniques to overco
me troublesome statistical noise associated with singlet operators. The cu
rrent demonstration is performed in the quenched approximation\, with a st
raightforward generalisation to the dynamical case to be considered in nea
r-future work.\n\nhttps://conference-indico.kek.jp/event/113/contributions
/2105/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2105/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Determination of $\\alpha_s$ in $N_f=3$ QCD from current-current c
orrelation functions in position space
DTSTART;VALUE=DATE-TIME:20200806T052000Z
DTEND;VALUE=DATE-TIME:20200806T054000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2078@conference-indico.kek.jp
DESCRIPTION:Speakers: Salvatore Calì (*) (Jagiellonian University)\nIn th
is talk\, we present a lattice determination of the coupling constant $\\a
lpha_s$ in $N_f=3$ QCD for renormalization scales $\\mu\\in(1\,2)$ GeV.\nT
he computation has been performed on ensembles generated by the Coordinat
ed Lattice Simulations (CLS) consortium\, with tree-level Symanzik-improve
d gauge action and Wilson O(a)-improved fermions. Our approach is based on
the study of current-current correlation functions in position space and
allows to determine $\\alpha_s$ (or alternatively the $\\Lambda$ parameter
) with a competitive precision.\n\nhttps://conference-indico.kek.jp/event/
113/contributions/2078/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2078/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Determination of the charm quark mass from Nf = 2+1 QCD with Wilso
n fermions
DTSTART;VALUE=DATE-TIME:20200806T050000Z
DTEND;VALUE=DATE-TIME:20200806T052000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2071@conference-indico.kek.jp
DESCRIPTION:Speakers: Sjoerd Bouma (*) (University of Regensburg)\nWe have
recently performed a determination of the charm quark mass on Nf = 2+1 CL
S ensembles of non-perturbatively improved Wilson fermions. I will present
the preliminary results of this analysis for the renormalization-group in
variant charm quark mass and the ratio m_c/m_s on these ensembles. The ext
rapolation to the chiral and continuum limits is performed using 5 lattice
spacings ranging roughly from 0.09 down to 0.04 fm and pion masses from 4
20 MeV to 130 MeV. The spatial extent of the ensembles is generally at lea
st 4 / M_\\pi. In my talk\, I will discuss the various analysis strategies
we considered\, including the fitting procedure\, corrections for the cor
relations in the data\, and the chiral-continuum extrapolation.\n\nhttps:/
/conference-indico.kek.jp/event/113/contributions/2071/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2071/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Pion Vector Form Factor from Lattice QCD at the physical point
DTSTART;VALUE=DATE-TIME:20200807T062000Z
DTEND;VALUE=DATE-TIME:20200807T064000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2126@conference-indico.kek.jp
DESCRIPTION:Speakers: Youngik Lee (*) (University of Bonn)\nWe present a L
attice QCD investigation of the pion electromagnetic form factor based on
gauge configurations generated by Extended Twisted Mass Collaboration with
N_f = 2+1+1 dynamical quark flavors. The calculation is carried out at tw
o different lattice spacing values directly at the physical point. Employi
ng Wilson clover twisted mass fermions at maximal twist guarantees O(a) im
proved results. We present a preliminary continuum extrapolation of the fo
rm factor and compare to the experiment. In addition\, we provide an estim
ate of the pion charge radius.\n\nhttps://conference-indico.kek.jp/event/1
13/contributions/2126/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2126/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Valance parton distribution of pion from lattice QCD
DTSTART;VALUE=DATE-TIME:20200807T060000Z
DTEND;VALUE=DATE-TIME:20200807T062000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2092@conference-indico.kek.jp
DESCRIPTION:Speakers: Xiang Gao (*) (Tsinghua University&BNL)\nWe present
a high-statistics lattice QCD determination of the valence parton distribu
tion function (PDF) of pion\, with a mass of 300 MeV\, using two very fine
lattice spacings of a = 0.06 fm and 0.04 fm. Our analysis use both RI-MOM
and ratio-based schemes to renormalize the equal-time bi-local quark-bili
near matrix elements of pions boosted up to 2.4 GeV momenta. We reconstruc
t the x-dependent PDF\, as well as infer the first few even moments of the
PDF using the 1-loop perturbative LaMET framework. This talk is based on
arXiv: 2007.06590.\n\nhttps://conference-indico.kek.jp/event/113/contribut
ions/2092/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2092/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Preliminary Lattice Calculation of the Pion Light-Cone Distributio
n Amplitude via the Operator Product Expansion
DTSTART;VALUE=DATE-TIME:20200807T052000Z
DTEND;VALUE=DATE-TIME:20200807T054000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2095@conference-indico.kek.jp
DESCRIPTION:Speakers: Anthony Grebe (*) (Massachusetts Institute of Techno
logy)\nThe moments of the pion light-cone distribution amplitude (LCDA) ca
n be extracted by comparison with the operator product expansion of the pi
on hadronic tensor with an artificially heavy intermediate quark. We perf
orm a preliminary lattice calculation of this hadronic tensor in the quenc
hed approximation at multiple lattice spacings and use it to extract the c
ontinuum limit of the second moment of the pion LCDA. Our results are in
agreement with other lattice calculations of the second moment\, illustrat
ing the potential of this method.\n\nhttps://conference-indico.kek.jp/even
t/113/contributions/2095/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2095/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Parton Distribution Functions from pseudo-distributions
DTSTART;VALUE=DATE-TIME:20200807T054000Z
DTEND;VALUE=DATE-TIME:20200807T060000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2067@conference-indico.kek.jp
DESCRIPTION:Speakers: Manjunath Bhat (*) (Adam Mickiewicz University)\nWe
present a detailed study of the nucleon unpolarized parton distribution fu
nction (PDF) using the approach of parton pseudo-distribution functions. W
e use this method to extract PDFs from the lattice results obtained using
simulations with the\nlight quark mass fixed to its physical value. Then\,
the physical Ioffe time distributions are obtained from the nucleon matri
x elements extracted from lattice simulations through a matching procedure
. We reconstruct the PDF using different approaches. Using a direct Fourie
r transform of Ioffe-time data poses an inverse problem\, due to the ill-d
efined inverse equation. We use two advanced reconstruction techniques to
tackle this problem: the Backus-Gilbert method and fitting data to a suita
ble function as implied by global fitting in phenomenology. We fit the rea
l and imaginary parts of Ioffe-time data to the cosine and sine Fourier tr
ansform of $x^a(1-x)^b$ type function\, respectively. We find good agreem
ent with PDFs from global fits and it is further improved by quantifying s
everal systematic effects.\n\nhttps://conference-indico.kek.jp/event/113/c
ontributions/2067/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2067/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Reaching high momenta using Distillation.
DTSTART;VALUE=DATE-TIME:20200807T070000Z
DTEND;VALUE=DATE-TIME:20200807T072000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2158@conference-indico.kek.jp
DESCRIPTION:Speakers: David Richards (Jefferson Lab)\nThe need to reach hi
gh hadron momentum is key to calculations of Parton Distribution Functions
and other measures of hadron structure within lattice QCD. Meanwhile\, t
he distillation framework provides a valuable means both of more fully sam
pling the lattice\, and of controlling the contribution of excited states.
In this talk\, we extend the distillation framework through the implement
ation of the so-called momentum-smearing method\, and show that it allows
a major improvement in the determination of the energies of the nucleon in
motion. We then apply the method to the extraction of the Nucleon Charge
s between nucleons at non-zero momentum.\n\nhttps://conference-indico.kek.
jp/event/113/contributions/2158/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2158/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon and Pion Ioffe time pseudo-distributions
DTSTART;VALUE=DATE-TIME:20200807T080000Z
DTEND;VALUE=DATE-TIME:20200807T082000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2114@conference-indico.kek.jp
DESCRIPTION:Speakers: Joseph Karpie (*) (Columbia University)\nThe light-c
one definition of Parton Distribution Functions (PDFs) does not allow for
a direct ab initio determination employing methods of Lattice QCD simulati
ons that naturally take place in Euclidean spacetime. In this presentation
we focus on pseudo-PDFs where the starting point is the equal time hadron
ic matrix element with the quark and anti-quark fields separated by a fini
te distance. We focus on Ioffe-time distributions\, which are functions of
the Ioffe-time ν\, and can be understood as the Fourier transforms of pa
rton distribution functions with respect to the momentum fraction variable
x. We present lattice results for the case of the nucleon and the pion\,
we discuss several lattice systematics and we also perform a comparison wi
th the pertinent phenomenological determinations\n\nhttps://conference-ind
ico.kek.jp/event/113/contributions/2114/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2114/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Two-current Correlations and the Pion Valence Quark Distribution f
rom Lattice QCD
DTSTART;VALUE=DATE-TIME:20200807T074000Z
DTEND;VALUE=DATE-TIME:20200807T080000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2087@conference-indico.kek.jp
DESCRIPTION:Speakers: Colin Egerer (*) (William & Mary)\nAn understanding
of the partonic structure of hadrons is an essential ingredient in making
precise predictions and measurements of hadronic cross-sections and variou
s Standard\, and Beyond Standard\, Model parameters. Several encouraging p
roposals have been developed in the past decade that relate lattice calcul
able quantities with PDFs via frameworks akin to QCD factorization. We rep
ort results of one such LQCD formalism\, wherein the pion valence quark di
stribution is extracted through a short-distance collinear factorization o
f space-like separated vector and axial-vector current correlations. A sim
ultaneous fit of such matrix elements computed on four distinct gauge ense
mbles\, including systematic lattice corrections\, yields a physical Ioffe
-time distribution (ITD). The pion valence PDF extracted from this ITD is
found to be consistent with experiment across the entire Bjorken-$x$ regio
n\, and offers tantalizing clues to its large-$x$ behavior. We further dem
onstrate the recently derived one-loop matching coefficient that is centra
l to this work has a well-controlled behavior in Ioffe-time.\n\nhttps://co
nference-indico.kek.jp/event/113/contributions/2087/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2087/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Compton amplitude via the Feynman-Hellman theorem
DTSTART;VALUE=DATE-TIME:20200807T072000Z
DTEND;VALUE=DATE-TIME:20200807T074000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2079@conference-indico.kek.jp
DESCRIPTION:Speakers: K. Utku Can (*) (University of Adelaide)\nIn this ta
lk\, we highlight our group's recent developments on computing the Compton
amplitude in a lattice approach. We briefly discuss how to access the Com
pton amplitude directly via the second-order Feynman-Hellmann theorem. As
an application\, we compute the nucleon Compton tensor across a range of p
hoton momenta at an unphysical quark mass. This enables us to study the $Q
^2$ dependence of the low moments of the nucleon structure functions in a
lattice calculation for the first time. We discuss possible further applic
ations of this approach.\n\nhttps://conference-indico.kek.jp/event/113/con
tributions/2079/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2079/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon structure from 2+1-flavor domain-wall fermions lattice QCD
DTSTART;VALUE=DATE-TIME:20200805T082000Z
DTEND;VALUE=DATE-TIME:20200805T084000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2149@conference-indico.kek.jp
DESCRIPTION:Speakers: Shigemi Ohta (IPNS\, KEK)\nCurrent status of LHP+RBC
joint nucleon structure calculations using RBC+UKQCD 2+1-flavor domain-wa
ll fermions lattice-QCD ensembles is summarized.\n\nhttps://conference-ind
ico.kek.jp/event/113/contributions/2149/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2149/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Staggering Nucleon Matrix Elements
DTSTART;VALUE=DATE-TIME:20200805T080000Z
DTEND;VALUE=DATE-TIME:20200805T082000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2129@conference-indico.kek.jp
DESCRIPTION:Speakers: Yin Lin (*) (Fermilab/University of Chicago)\nWe wil
l present the first calculation of the nucleon vector and axial-vector cha
rges with a single 2+1+1 flavors Highly Improved Staggered Quarks (HISQ) e
nsemble generated by the MILC collaboration and a matching valence action.
We will focus on the theoretical foundation of staggered baryons and outl
ine the methods to calculate physical observables with staggered valence q
uarks.\n\nhttps://conference-indico.kek.jp/event/113/contributions/2129/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2129/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice calculation of GPDs and twist-3 PDFs of the proton
DTSTART;VALUE=DATE-TIME:20200805T074000Z
DTEND;VALUE=DATE-TIME:20200805T080000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2166@conference-indico.kek.jp
DESCRIPTION:Speakers: Aurora Scapellato (*) (Adam Mickiewicz University)\n
In this talk we present the first lattice QCD calculation of unpolarized a
nd helicity generalized parton distributions (GPDs) for the proton. We us
e the quasi-distribution approach\, which relies on computations of corre
lation functions that\, for sufficiently fast moving hadrons\, can
be matched to light-cone distributions using perturbation theory.
The calculations are performed on an ensemble of $N_f= 2 + 1 + 1$ maximall
y twisted mass fermions with a clover improvement\, at pion mass $m_\\pi=2
70$ MeV and lattice spacing $a=0.093$ fm. The proton is boosted up to 1.67
GeV to check momentum convergence. We are able to extract the $x$-depend
ence of GPDs\, that is mostly unknown so far\, with controlled statistical
uncertainties. We also present other directions we explore\, such as the
extraction of the twist-3 parton distribution function $g_T(x)$ and the te
st of the Wandura-Wilczek approximation.\n\nhttps://conference-indico.kek.
jp/event/113/contributions/2166/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2166/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon electromagnetic form factors at large momenta using the Fe
ynman-Hellmann theorem
DTSTART;VALUE=DATE-TIME:20200805T072000Z
DTEND;VALUE=DATE-TIME:20200805T074000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2066@conference-indico.kek.jp
DESCRIPTION:Speakers: Mischa Batelaan (*) (University of Adelaide)\nThe ha
dronic form factors at large momentum transfers often suffer from substant
ial excited state contributions and poor signal-to-noise ratios. Using the
Feynman-Hellmann theorem allows for calculations of the hadronic form fac
tors which only rely on two-point functions this allows access to higher m
omenta while still controlling the excited state contributions. We will pr
esent results from our study of the electromagnetic form factors of the nu
cleons up to approximately \\(9 \\textrm{ GeV}^2\\). The calculations are
performed using \\(N_{f} = 2+1\\) flavour\, \\(\\mathcal{O}(a)\\)-improved
Wilson fermions on lattices with spacing \\(a=0.074 \\textrm{ fm}\\) and
three different pion masses of \\(466 \\textrm{ MeV}\\)\, \\(360 \\textrm{
MeV}\\) and \\(310 \\textrm{ MeV}\\).\n\nhttps://conference-indico.kek.jp
/event/113/contributions/2066/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2066/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon structure at physical point in 2 + 1 flavor lattice QCD
DTSTART;VALUE=DATE-TIME:20200805T070000Z
DTEND;VALUE=DATE-TIME:20200805T072000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2177@conference-indico.kek.jp
DESCRIPTION:Speakers: Ryutaro Tsuji (*) (Tohoku University)\nWe will prese
nt the current status of nucleon structure studies with physical light qua
rks (m_pi = 135 MeV) in a large spatial extent of about 10 fm. Our calcula
tions are carried out with the PACS10 gauge configurations generated by th
e PACS Collaboration with the stout-smeared O(a) improved Wilson fermions
and Iwasaki gauge action at beta=1.82 corresponding to the lattice spacing
of 0.084 fm. In this talk\, we mainly focus on the quark momentum and hel
icity fractions\, which are regarded as bench marks on lattice calculation
s of parton distribution functions. In addition\, we will also present the
preliminary result of the axial charge with another PACS10 ensemble gener
ated at the finer lattice spacing\, so as to estimate the systematic uncer
tainties due to the lattice discretization error.\n\nhttps://conference-in
dico.kek.jp/event/113/contributions/2177/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2177/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice QCD calculation of the pion charge radius using a model-in
dependent method
DTSTART;VALUE=DATE-TIME:20200805T060000Z
DTEND;VALUE=DATE-TIME:20200805T062000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2089@conference-indico.kek.jp
DESCRIPTION:Speakers: Yang Fu (*) (Peking University)\nWe use a method to
calculate the hadron's charge radius without model-dependent momentum extr
apolations. The method does not require the additional quark propagator in
versions on the twisted boundary conditions or the computation of the mome
ntum derivatives of quark propagators and thus is easy to implement. We ap
ply this method to the calculation of pion charge radius ⟨r^2⟩. For co
mparison\, we also determine ⟨r^2⟩ with the traditional approach of co
mputing the slope of the form factors. The new method produces results con
sistent with those from the traditional method and with statistical errors
1.5-1.9 times smaller. For the four gauge ensembles at the physical pion
masses\, the statistical errors of ⟨r^2⟩ range from 2.1% to 4.6% by us
ing ≲50 configurations. For the ensemble at m_π≈340 MeV\, the statist
ical uncertainty is even reduced to a sub-percent level.\n\nhttps://confer
ence-indico.kek.jp/event/113/contributions/2089/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2089/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Finite-volume effects in HVP contribution to muon g-2
DTSTART;VALUE=DATE-TIME:20200805T054000Z
DTEND;VALUE=DATE-TIME:20200805T060000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2153@conference-indico.kek.jp
DESCRIPTION:Speakers: Agostino Patella (Humboldt-Universität zu Berlin)\n
The leading finite-volume corrections to the HVP contribution to the muoni
c (g-2) are related to the forward Compton amplitude of the pion in a comp
letely model-independent fashion. The developed formalism is able to captu
re a few leading contributions\, up to errors of order exp(-wML) where w~1
.93 and M is the pion mass. By using models and chiPT for the forward Comp
ton tensor\, the finite-volume corrections are estimated for typical inter
esting volumes.\n\nhttps://conference-indico.kek.jp/event/113/contribution
s/2153/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2153/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hadronic light-by-light contribution to $(g-2)_\\mu$ near the SU(3
)-flavor-symmetric point
DTSTART;VALUE=DATE-TIME:20200805T052000Z
DTEND;VALUE=DATE-TIME:20200805T054000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2082@conference-indico.kek.jp
DESCRIPTION:Speakers: En-Hung Chao (*) (Johannes Gutenberg-Universität Ma
inz)\nUnderstanding the tension between the Standard Model prediction and
the experimental results on the anomalous magnetic moment of the muon (a_\
\mu) has been an active research field over the past two decades. The theo
retical uncertainty mainly comes from the hadronic contributions\, among w
hich the hadronic light-by-light scattering ($a_\\mu^{hlbl}$) process play
s an important role. We investigate this contribution on the lattice with
a position-space approach. In our setup\, we treat separately the QED part
in the continuum and infinite volume and the QCD part on the lattice\, wh
ich helps to avoid finite-size effects due to the photon in finite-volume.
However\, noticeable finite-size effects due to long-distance physics sti
ll persist in our approach. In our recent work [arXiv:2006.16224]\, we hav
e performed computations of $a_\\mu^{hlbl}$ on the lattice with $N_f=3$ en
sembles having degenerate light and strange quark masses. Our results have
satisfactory statistical errors and allow us to concentrate on our strate
gy to control the finite-size effects using the pion-exchange contribution
. The extension of our setup to include non flavor-symmetric ensembles doe
s not require much effort\, thanks to the pre-computed single-propagator t
race in position space shared among other Mainz projects. Our work in prog
ress toward the physical point will be briefly reported\, with focus on th
e Wick-contraction topologies that vanish at the flavor-symmetric point.\n
\nhttps://conference-indico.kek.jp/event/113/contributions/2082/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2082/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QED+QCD Corrections to the Anomalous Magnetic Moment of the Muon
DTSTART;VALUE=DATE-TIME:20200805T050000Z
DTEND;VALUE=DATE-TIME:20200805T052000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2185@conference-indico.kek.jp
DESCRIPTION:Speakers: Alex Westin (*) (University of Adelaide)\nThere exis
ts a long standing discrepancy of around 3.5 sigma between experimental me
asurements and standard model calculations of the magnetic moment of the m
uon. Current experiments aim to reduce the experimental uncertainty by a f
actor of 4\, and Standard Model calculations must also be improved by a si
milar order. The largest uncertainty in the Standard Model calculation com
es from the QCD contribution\, in particular the leading order hadronic va
cuum polarisation (HVP). To calculate the HVP contribution\, we use lattic
e gauge theories which allows us to study QCD at low energies. In order to
better understand this quantity\, we investigate the effect of QED correc
tions to the leading order HVP term by including QED in our lattice calcul
ations\, and investigate flavour breaking effects. This is done using full
y dynamical QCD+QED gauge configurations generated by the QCDSF collaborat
ion and a novel method of quark turning.\n\nhttps://conference-indico.kek.
jp/event/113/contributions/2185/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2185/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quark composition and color structure of heavy-heavy mesons and te
traquarks
DTSTART;VALUE=DATE-TIME:20200804T080000Z
DTEND;VALUE=DATE-TIME:20200804T082000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2181@conference-indico.kek.jp
DESCRIPTION:Speakers: Marc Wagner (Goethe University Frankfurt)\nWe explor
e the quark composition of bottomonium bound states and resonances with I
= 0 and L = 0 using lattice QCD static potentials from a previous study of
string breaking and the Born-Oppenheimer approximation. We also compare t
he relative importance of meson-meson and diquark-antidiquark creation ope
rators for the lattice QCD static potential relevant for b-bar b-bar u d t
etraquarks with I = 0.\n\nhttps://conference-indico.kek.jp/event/113/contr
ibutions/2181/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2181/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Studies on meson-baryon interactions in the HAL QCD method with al
l-to-all propagators
DTSTART;VALUE=DATE-TIME:20200804T074000Z
DTEND;VALUE=DATE-TIME:20200804T080000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2143@conference-indico.kek.jp
DESCRIPTION:Speakers: Kotaro Murakami (*) (Yukawa Institute for Theoretica
l Physics\, Kyoto University)\nWe investigate meson-baryon interactions in
the HAL QCD method with all-to-all propagators using the stochastic estim
ations. We mainly report the analysis of the S-wave kaon-nucleon interacti
ons at $m_{\\pi} \\approx 570$ MeV. Since there are no quark-antiquark cre
ation/annihilation processes in this system\, all-to-all propagators merel
y play a role in increasing statistics. In addition\, we present the preli
minary results for the P-wave pion-nucleon interaction in the $I=3/2$ chan
nel using the $\\Delta$ source operator on a small volume at $m_{\\pi} \\
approx 870$ MeV\, which has a bound state corresponding to the $\\Delta$(1
232) state.\n\nhttps://conference-indico.kek.jp/event/113/contributions/21
43/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2143/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bottomonium resonances from lattice QCD static-static-light-light
potentials
DTSTART;VALUE=DATE-TIME:20200804T072000Z
DTEND;VALUE=DATE-TIME:20200804T074000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2142@conference-indico.kek.jp
DESCRIPTION:Speakers: Lasse Mueller (*) (Goethe University Frankfurt)\nWe
study I = 0 quarkonium resonances decaying into pairs of heavy-light meson
s using static-static-light-light potentials from lattice QCD. To this end
\, we solve a coupled channel Schrödinger equation with one confined quar
konium channel and two channels with a heavy-light meson pair to compute p
hase shifts and t-matrix poles for the lightest decay channel. Finally\, w
e discuss our results in the context of corresponding experimental results
.\n\nhttps://conference-indico.kek.jp/event/113/contributions/2142/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2142/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Study of the rho resonance using the HAL QCD method
DTSTART;VALUE=DATE-TIME:20200804T062000Z
DTEND;VALUE=DATE-TIME:20200804T064000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2060@conference-indico.kek.jp
DESCRIPTION:Speakers: Yutaro Akahoshi (*) (Yukawa Institute for Theoretica
l Physics\, Kyoto University)\nIn this talk\, we show the recent status of
the rho resonance study in the HAL QCD method.\nWe investigate the I=1 tw
o-pion potential at $m_{\\pi} \\approx 411$ MeV by using a new calculation
strategy\, namely the combination of three techniques: the one-end trick\
, the sequential propagator\, and covariant approximation averaging (CAA).
\nThanks to the new strategy\, we determine the non-local I=1 two-pion pot
ential at the next-leading-order of the derivative expansion for the first
time and obtain the pole of the S-matrix corresponding to the rho resonan
ce.\nAs regards the resonance parameters\, our resonance mass is consisten
t with the previous study using the finite-volume method\, but slightly la
rger decay width and coupling are obtained. We discuss possible origins of
this difference.\n\nhttps://conference-indico.kek.jp/event/113/contributi
ons/2060/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2060/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Equivalence of three-particle quantization conditions
DTSTART;VALUE=DATE-TIME:20200804T054000Z
DTEND;VALUE=DATE-TIME:20200804T060000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2168@conference-indico.kek.jp
DESCRIPTION:Speakers: Stephen Sharpe (University of Washington)\nWe show t
hat a recently derived alternative form of the relativistic three-particle
quantization condition for identical particles can be rewritten in terms
of the R matrix introduced to give a unitary representation of the infinit
e-volume three-particle scattering amplitude. Combined with earlier work\,
this shows the equivalence of the relativistic effective field theory app
roach of Refs. [1\, 2] and the “finite-volume unitarity” approach of R
efs. [3\, 32]. It also provides a generalization of the latter approach to
arbitrary angular momentum of two-particle subsystems.\n\nhttps://confere
nce-indico.kek.jp/event/113/contributions/2168/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2168/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alternative derivation of relativistic three-particle quantization
condition
DTSTART;VALUE=DATE-TIME:20200804T052000Z
DTEND;VALUE=DATE-TIME:20200804T054000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2070@conference-indico.kek.jp
DESCRIPTION:Speakers: Tyler Blanton (*) (University of Washington)\nWe pre
sent a simplified derivation of the relativistic three-particle quantizati
on condition for identical\, spinless particles. The simplification is aff
orded by using time-ordered perturbation theory (TOPT) and a three-particl
e quasilocal K matrix that is not fully symmetrized to organize the releva
nt diagrams in an intuitive manner\, ultimately leading to a new form of t
he quantization condition. This form can then be related algebraically to
both the standard quantization condition\, which uses a fully symmetric th
ree-particle K matrix\, and the quantization condition based on extending
unitary representations of the three-particle amplitude to finite volume.
It should also allow a more straightforward generalization of the quantiza
tion condition to nondegenerate particles\, and perhaps also to more than
three particles.\n\nhttps://conference-indico.kek.jp/event/113/contributio
ns/2070/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2070/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bringing scattering data to the finite volume of lattice QCD
DTSTART;VALUE=DATE-TIME:20200804T060000Z
DTEND;VALUE=DATE-TIME:20200804T062000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2058@conference-indico.kek.jp
DESCRIPTION:Speakers: Curtis Abell (*) (University of Adelaide)\nHamiltoni
an effective field theory (HEFT) is an approach which allows for the extra
ction of hadron finite-volume energy spectra from scattering observables s
uch as phase shifts and inelasticities. As an alternative to Luscher's met
hod\, HEFT easily generalises to systems with multiple coupled channels an
d multiple bare states. HEFT also allows for the extraction of eigenvector
s from the Hamiltonian\, providing new insight into the composition of fin
ite-volume eigenstates and their dependence on the lattice volume. In this
presentation we’ll explore renormalisation in HEFT using pion-nucleon s
cattering data in the Delta resonance channel. By examining the compositio
n of the Delta resonance and its dependence on the regulator parameter\, c
onnections with alternative renormalisation schemes are made.\n\nhttps://c
onference-indico.kek.jp/event/113/contributions/2058/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2058/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Finite-volume scattering formalism for all three-pion isospin chan
nels
DTSTART;VALUE=DATE-TIME:20200804T050000Z
DTEND;VALUE=DATE-TIME:20200804T052000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2196@conference-indico.kek.jp
DESCRIPTION:Speakers: Maxwell Hansen (CERN)\nI summarize recent work (arXi
v:2003.10974) providing a generalization of finite-volume scattering forma
lism for non-identical pions in isosymmetric QCD. The result allows one to
use discrete finite-volume energies\, determined using lattice QCD\, to c
onstrain scattering amplitudes for all possible values of two- and three-p
ion isospin. As an example\, I present a toy implementation for I(πππ)
= 0\, focusing on the quantum numbers of the ω and h1 resonances.\n\nhttp
s://conference-indico.kek.jp/event/113/contributions/2196/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2196/
END:VEVENT
BEGIN:VEVENT
SUMMARY:What is chiral susceptibility probing?
DTSTART;VALUE=DATE-TIME:20200804T082000Z
DTEND;VALUE=DATE-TIME:20200804T084000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2090@conference-indico.kek.jp
DESCRIPTION:Speakers: Hidenori Fukaya (Osaka University)\nThe chiral susce
ptibility\, or the first derivative of the chiral condensate\, is used as
a probe for QCD phase transition. It is well-known that the chiral condens
ate is an order parameter of SU(2)_L x SU(2)_R symmetry breaking. However\
, the condensate also breaks the axial U(1) symmetry\, which is usually no
t paid attention as it is already broken by anomaly. In this talk\, we wou
ld like to show a surprising numerical result by JLQCD collaboration that
the chiral susceptibility is dominated by the axial U(1) anomaly at high
temperature. Namely\, the chiral susceptibility is probing the temperature
dependence of anomaly\, rather than that of SU(2)_L x SU(2)_R.\n\nhttps:/
/conference-indico.kek.jp/event/113/contributions/2090/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2090/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QCD Equation of State in External Magnetic Field and at Finite Bar
yon Density
DTSTART;VALUE=DATE-TIME:20200804T080000Z
DTEND;VALUE=DATE-TIME:20200804T082000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2118@conference-indico.kek.jp
DESCRIPTION:Speakers: Natalia Kolomoyets (JINR)\nIn this report we present
our first results on lattice study of QCD equation of state in external m
agnetic field and at finite baryon density. The simulations are performed
with $N_f = 2+1$ rooted staggered quarks at physical quark masses. Finite
baryon density is implemented through the lattice simulations at imaginary
chemical potential. The results for the equation of state are expanded in
imaginary chemical potential up to $O(\\mu_B^6)$ and analytically continu
ed to the real domain. A significant influence of the magnetic field on QC
D equation of state is observed.\n\nhttps://conference-indico.kek.jp/event
/113/contributions/2118/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2118/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Anisotropic pressure induced by finite-size effects at nonzero tem
perature in SU(3) Yang-Mills theory
DTSTART;VALUE=DATE-TIME:20200804T074000Z
DTEND;VALUE=DATE-TIME:20200804T080000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2117@conference-indico.kek.jp
DESCRIPTION:Speakers: Masakiyo Kitazawa (Osaka University)\nWe study the p
ressure anisotropy in anisotropic finite-size systems in SU(3) Yang-Mills
theory at nonzero temperature. Lattice simulations are performed on lattic
es with anisotropic spatial volumes with periodic boundary conditions. The
energy-momentum tensor defined through the gradient flow is used for the
analysis of the stress tensor on the lattice. We find that a clear finite-
size effect in the pressure anisotropy is observed only at a significantly
shorter spatial extent compared with the free scalar theory\, even when a
ccounting for a rather large mass in the latter.\n\nhttps://conference-ind
ico.kek.jp/event/113/contributions/2117/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2117/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fluctuations of conserved charges in a background magnetic field
DTSTART;VALUE=DATE-TIME:20200804T072000Z
DTEND;VALUE=DATE-TIME:20200804T074000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2127@conference-indico.kek.jp
DESCRIPTION:Speakers: Sheng-Tai Li (*) (Chinese Academy of Sciences (CAS)
- Institute of Modern Physics (IMP) & Central China Normal University)\nWe
will present results on the second order fluctuations of net baryon numbe
r\, electric charge and strangeness as well as correlations among these co
nserved charges in (2+1)-flavor lattice QCD in the presence of a backgroun
d magnetic field.\nSimulations are performed using the tree level improved
gauge action and the highly improved staggered quark\n(HISQ) action with
a fixed scale approach ($a$=0.117 fm). The light quark mass is set to be 1
/10 of the physical strange quark mass and the corresponding pion mass is
about 220 MeV at vanishing magnetic field. At zero temperature the simulat
ions are performed on $32^3\\times96$ lattices while at nonzero temperatur
e on $32^3\\times N_\\tau$ lattices having six values of $N_\\tau$ varying
from 16 to 6 corresponding to temperature ranging from 105 MeV to 280 MeV
. The magnetic field strength $eB$ is simulated with about 15 different va
lues up to 3.5 GeV$^2$ at each temperature. Chiral condensates and disconn
ected susceptibilities as a function of $eB$ are also discussed.\n\nhttps:
//conference-indico.kek.jp/event/113/contributions/2127/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2127/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A new perspective to hadronic excitations above Tc
DTSTART;VALUE=DATE-TIME:20200804T070000Z
DTEND;VALUE=DATE-TIME:20200804T072000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2162@conference-indico.kek.jp
DESCRIPTION:Speakers: Christian Rohrhofer (*) (Osaka University)\nHadronic
matter is known to change its behaviour during a crossover at finite temp
erature. One part of this crossover is the chiral transition\, whose prope
rties are well studied. The other part involves the fate of hadronic bound
states and single quarks\, the transition of which is less clear. We stud
y two-flavor QCD for temperatures starting from 190 MeV and quark masses d
own to lighter-than-physical quarks using chirally symmetric domain-wall f
ermions. Adopting a novel approach to fit lattice data we get new results
for screening masses\, which allow for a more detailed comparison to pertu
rbative calculations. The lattice data favors a cut instead of a single po
le for the propagation of hadronic excitations above Tc. Key features of p
revious studies\, including chiral spin and SU(4) symmetry\, are reproduce
d.\n\nhttps://conference-indico.kek.jp/event/113/contributions/2162/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2162/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice QCD on QPACE 4
DTSTART;VALUE=DATE-TIME:20200804T062000Z
DTEND;VALUE=DATE-TIME:20200804T064000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2139@conference-indico.kek.jp
DESCRIPTION:Speakers: Nils Meyer (University of Regensburg)\nQPACE 4 is th
e latest member of the QCD PArallel Compute Engine (QPACE) series\, which
was deployed in Regensburg in June 2020. It features 64 Fujitsu A64FX mod
el FX700 CPUs interconnected by InfiniBand EDR. The A64FX is the first CP
U supporting the Arm Scalable Vector Extension (SVE). In this contributio
n we discuss the implementation of SVE in the Grid Lattice QCD framework a
nd show Grid benchmarks on QPACE 4.\n\nhttps://conference-indico.kek.jp/ev
ent/113/contributions/2139/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2139/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Extending Bridge++ Lattice Simulation Code to Vector Processors
DTSTART;VALUE=DATE-TIME:20200804T060000Z
DTEND;VALUE=DATE-TIME:20200804T062000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2062@conference-indico.kek.jp
DESCRIPTION:Speakers: Tatsumi Aoyama (KEK)\nWe report our recent extension
of Bridge++\, a general-purpose code set for numerical simulations of lat
tice gauge theories\, to the latest vector processor\, NEC SX-Aurora TSUBA
SA. The Bridge++ project aims at developing a readable\, extensible\, and
portable workbench with sufficiently high performance. Based on the code s
et we investigate fast algorithms for parallel numerical calculations\, an
d code optimization techniques. While the major target of the code set has
been cluster systems with scalar processors\, we are now extending it to
various architectures such as GPUs and processors with wide SIMD registers
. In this talk\, we introduce our framework for accommodating these platfo
rms\, and present the optimization for the vector processor.\n\nhttps://co
nference-indico.kek.jp/event/113/contributions/2062/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2062/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Multiple right-hand-side implementation for DD$\\alpha$AMG
DTSTART;VALUE=DATE-TIME:20200804T054000Z
DTEND;VALUE=DATE-TIME:20200804T060000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2191@conference-indico.kek.jp
DESCRIPTION:Speakers: Shuhei Yamamoto (*) (The Cyprus Institute)\nWe prese
nt a multiple right-hand side (rhs) implementation of the Adaptive Aggrega
tion-based Domain Decomposition Multigrid method (DD$\\alpha$AMG) using tw
isted mass fermions.\nOur implementation extends the strong scaling region
of DD$\\alpha$AMG and simplifies vectorization\, which would otherwise re
quire using vector extensions. This multiple rhs implementation is thus be
tter suited to take advantage of current and emerging HPC trends\, which i
nvolve increasing core counts per node and more diverse CPU architectures\
, such as ARM\, Intel Xeon\, and AMD Epyc.\nIn this talk\, we will describ
e our implementation strategy and show preliminary scaling results. Moreov
er\, we will show preliminary results obtained using Block Krylov solvers
as complementary preconditioners within DD$\\alpha$AMG\, as provided by th
e Fast Accurate Block Linear krylOv Solver (Fabulous) library.\n\nhttps://
conference-indico.kek.jp/event/113/contributions/2191/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2191/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Multigrid methods for Chiral Fermions
DTSTART;VALUE=DATE-TIME:20200804T052000Z
DTEND;VALUE=DATE-TIME:20200804T054000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2072@conference-indico.kek.jp
DESCRIPTION:Speakers: Peter Boyle (Brookhaven National Laboratory)\nWe com
pare two of different methods for coarsening domain wall fermions and disc
uss progress towards a multigrid method for DWF with the ability to set up
and solve during gauge configuration generation.\n\nhttps://conference-in
dico.kek.jp/event/113/contributions/2072/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2072/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A better conditioned Domain Wall Operator
DTSTART;VALUE=DATE-TIME:20200804T050000Z
DTEND;VALUE=DATE-TIME:20200804T052000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2146@conference-indico.kek.jp
DESCRIPTION:Speakers: Hartmut Neff ()\nA variation of the Domain Wall oper
ator with an additional parameter α will be introduced. The conditioning
of the new Domain Wall operator depends on α\, whereas the corresponding
4D propagator does not. The new and the conventional Domain Wall operator
agree for α = 1. By tuning α\, speed ups of the linear system solvers of
around 20% could be achieved.\n\nhttps://conference-indico.kek.jp/event/1
13/contributions/2146/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2146/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Energy-like observables for the chiral phase transition of 2+1 fla
vor QCD
DTSTART;VALUE=DATE-TIME:20200804T062000Z
DTEND;VALUE=DATE-TIME:20200804T064000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2165@conference-indico.kek.jp
DESCRIPTION:Speakers: Mugdha Sarkar (*) (Bielefeld University)\nThe chiral
symmetry restoration of QCD\, with two light flavours in the chiral limit
\, is expected to be a phase transition belonging to the universality clas
s of 3d O(N) models. The imprint of the criticality should be observed in
the thermodynamic observables if we move close enough to the chiral limit.
We discuss results of conserved charge fluctuations and Polyakov loop\, w
hich we propose to behave as energy-like observables with respect to the c
hiral phase transition\, towards the chiral limit. Calculations have been
performed on 2+1 flavour HISQ ensembles with pion masses starting from 160
MeV down to 55 MeV.\n\nhttps://conference-indico.kek.jp/event/113/contrib
utions/2165/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2165/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Grand Canonical Distribution from LQCD for experiment data analysi
s
DTSTART;VALUE=DATE-TIME:20200804T060000Z
DTEND;VALUE=DATE-TIME:20200804T062000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2094@conference-indico.kek.jp
DESCRIPTION:Speakers: Vladimir Goy (Far Eastern Federal University)\nWe pr
opose new way of heavy ion collisions experiment data analysis. We analyze
physical parameters of fireball created in RHIC experiment based on Grand
Canonical Distribution and different Lattice QCD data available at the mo
ment. Our results on chemical potential are in agreement with previous mod
el estimations and do not depend on Lattice setup. At same time\, we found
possible T(V) states of fireball and estimated the most probable temperat
ure and volume of fireball as function of collision energy.\n\nhttps://con
ference-indico.kek.jp/event/113/contributions/2094/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2094/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dirac eigenvalue spectrum and its relation to U(1)A symmetry break
ing in high temperature Nf = 2 + 1 QCD
DTSTART;VALUE=DATE-TIME:20200804T054000Z
DTEND;VALUE=DATE-TIME:20200804T060000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2194@conference-indico.kek.jp
DESCRIPTION:Speakers: Yu Zhang (*) (Central China Normal University)\nWe w
ill present results on the Dirac eigenvalue spectrum as well as its relati
on to the axial U(1) and SU(2)xSU(2) symmetries at a high temperature in (
2+1)-flavor QCD. The simulations are carried out using the highly improved
staggered quarks (HISQ) action on Nτ = 8\, 12 and 16 lattices with the a
spect ratio Nσ /Nτ in a range of [4\,9] and 4-5 pion masses ranging from
160 MeV to 55 MeV at a single temperature of ∼ 200 MeV.\n\nhttps://conf
erence-indico.kek.jp/event/113/contributions/2194/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2194/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chiral phase transition temperature in (2+1)-flavor QCD
DTSTART;VALUE=DATE-TIME:20200804T052000Z
DTEND;VALUE=DATE-TIME:20200804T054000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2122@conference-indico.kek.jp
DESCRIPTION:Speakers: Anirban Lahiri (Bielefeld University)\nWe present a
lattice QCD based determination of the chiral phase transition temperature
in QCD with two massless (up and down) and one strange quark having its p
hysical mass. We propose and calculate two novel estimators for the chira
l transition temperature for several values of the light quark masses\, co
rresponding to Goldstone pion masses in the range between (approximately)
58 MeV and (approximately) 163 MeV. The chiral phase transition temperatur
e is determined by extrapolating to vanishing pion mass using universal sc
aling analysis. After thermodynamic\, continuum and chiral extrapolations
we find the chiral phase transition temperature $T_c^0=132^{+3}_{-6}$~MeV.
\n\nhttps://conference-indico.kek.jp/event/113/contributions/2122/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2122/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thermal transition in QCD with Nf=2+1 flavours of Wilson quark
DTSTART;VALUE=DATE-TIME:20200804T050000Z
DTEND;VALUE=DATE-TIME:20200804T052000Z
DTSTAMP;VALUE=DATE-TIME:20200807T083921Z
UID:indico-contribution-113-2057@conference-indico.kek.jp
DESCRIPTION:Speakers: Gert Aarts (Swansea University)\nThe thermal transit
ion in QCD has been studied in detail using the staggered-quark formulatio
n. Here we report on progress using Nf=2+1 flavours of Wilson fermions\, e
mploying anisotropic\, fixed-scale lattice simulations. Observables are co
mpared for two values of the pion mass\, focusing on chiral properties: th
e chiral condensate and its susceptibility\, quark number susceptibilities
\, and the onset of parity doubling in the light and strange baryonic sect
or. For the pseudo-critical temperature obtained from the chiral condensat
e\, we combine our results with those from twisted-mass fermions and extra
polate to the physical point - without a continuum extrapolation -\, yield
ing T_pc=159(6) MeV.\n\nhttps://conference-indico.kek.jp/event/113/contrib
utions/2057/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2057/
END:VEVENT
END:VCALENDAR