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BEGIN:VEVENT
SUMMARY:Valance parton distribution of pion from lattice QCD
DTSTART:20200807T060000Z
DTEND:20200807T062000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2092@conference-indico.kek.jp
DESCRIPTION:Speakers: Xiang Gao (*) (Tsinghua University&BNL)\n\nWe presen
t a high-statistics lattice QCD determination of the valence parton distri
bution function (PDF) of pion\, with a mass of 300 MeV\, using two very fi
ne lattice spacings of a = 0.06 fm and 0.04 fm. Our analysis use both RI-M
OM and ratio-based schemes to renormalize the equal-time bi-local quark-bi
linear matrix elements of pions boosted up to 2.4 GeV momenta. We reconstr
uct the x-dependent PDF\, as well as infer the first few even moments of t
he PDF using the 1-loop perturbative LaMET framework. This talk is based o
n arXiv: 2007.06590.\n\nhttps://conference-indico.kek.jp/event/113/contrib
utions/2092/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2092/
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:20200807T074000Z
DTEND:20200807T080000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2169@conference-indico.kek.jp
DESCRIPTION:Speakers: Akihiro SHIBATA (Computing Research Center\, KEK)\,
Shogo Nishino\, Ryutaro Matsudo\, Kei-Ichi Kondo\n\nAt the last lattice co
nference\, we have proposed to investigate the massive Yang-Mills model\,
namely\, Yang-Mills theory with a gauge-invariant gluon mass term\, in ord
er to clarify the mechanism of quark confinement in the Yang-Mills theory
with massgap. The gluon mass term simulates the dynamically generated mas
s to be extracted in the low-energy effective theory of the Yang-Mills the
ory and plays the role of a new probe to study the phase structure and con
finement mechanism.\nIn this talk\, we first review the massive Yang-Mill
s model\, whose gauge-invariant gluon mass term is deduced from a specific
gauge-scalar model with a single radially-fixed scalar field under a suit
able constraint called the reduction condition\, and why such a gauge-scal
ar model is constructed without breaking the gauge symmetry through the ga
uge-independent description of the Brout-Englert-Higgs mechanism which doe
s not rely on the spontaneous breaking of gauge symmetry. Then\, we discu
ss how the numerical simulations for the proposed massive Yang-Mills theor
y can be performed by taking into account he reduction condition in the c
omplementary gauge-scalar model on a lattice.\n\nhttps://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:Staggering Nucleon Matrix Elements
DTSTART:20200805T080000Z
DTEND:20200805T082000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2129@conference-indico.kek.jp
DESCRIPTION:Speakers: Aaron Meyer\, Andreas Kronfeld\, Fermilab Lattice an
d MILC collaborations\, Alexei Strelchenko\, Steven Gottlieb\, James Simon
e\, Ciaran Hughes\, Yin Lin (*) (Fermilab/University of Chicago)\n\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:Target space defects and anisotropic gauge theories
DTSTART:20200807T054000Z
DTEND:20200807T060000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2147@conference-indico.kek.jp
DESCRIPTION:Speakers: Stam Nicolis (Institut Denis Poisson (CNRS UMR7013))
\n\nWe study the defects that can be defined within the framework of latti
ce gauge theories\, in the presence of anisotropic couplings and try to i
dentify their target space avatars. These are relevant for describing topo
logical insulators.\n\nhttps://conference-indico.kek.jp/event/113/contribu
tions/2147/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2147/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Extending Bridge++ Lattice Simulation Code to Vector Processors
DTSTART:20200804T060000Z
DTEND:20200804T062000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2062@conference-indico.kek.jp
DESCRIPTION:Speakers: Bridge++ project\, I. Kanamori\, Y. Namekawa\, H. Ma
tsufuru\, Tatsumi Aoyama (KEK)\n\nWe report our recent extension of Bridge
++\, a general-purpose code set for numerical simulations of lattice gauge
theories\, to the latest vector processor\, NEC SX-Aurora TSUBASA. The Br
idge++ project aims at developing a readable\, extensible\, and portable w
orkbench with sufficiently high performance. Based on the code set we inve
stigate fast algorithms for parallel numerical calculations\, and code opt
imization techniques. While the major target of the code set has been clus
ter systems with scalar processors\, we are now extending it to various ar
chitectures such as GPUs and processors with wide SIMD registers. In this
talk\, we introduce our framework for accommodating these platforms\, and
present the optimization for the vector processor.\n\nhttps://conference-i
ndico.kek.jp/event/113/contributions/2062/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2062/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bringing scattering data to the finite volume of lattice QCD
DTSTART:20200804T060000Z
DTEND:20200804T062000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2058@conference-indico.kek.jp
DESCRIPTION:Speakers: Curtis Abell (*) (University of Adelaide)\, Derek B.
Leinweber\, Anthony W. Thomas\n\nHamiltonian effective field theory (HEFT
) is an approach which allows for the extraction of hadron finite-volume e
nergy spectra from scattering observables such as phase shifts and inelast
icities. As an alternative to Luscher's method\, HEFT easily generalises t
o systems with multiple coupled channels and multiple bare states. HEFT al
so allows for the extraction of eigenvectors from the Hamiltonian\, provid
ing new insight into the composition of finite-volume eigenstates and thei
r dependence on the lattice volume. In this presentation we’ll explore r
enormalisation in HEFT using pion-nucleon scattering data in the Delta res
onance channel. By examining the composition of the Delta resonance and it
s dependence on the regulator parameter\, connections with alternative ren
ormalisation schemes are made.\n\nhttps://conference-indico.kek.jp/event/1
13/contributions/2058/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2058/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Study of the rho resonance using the HAL QCD method
DTSTART:20200804T062000Z
DTEND:20200804T064000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2060@conference-indico.kek.jp
DESCRIPTION:Speakers: Yutaro Akahoshi (*) (Yukawa Institute for Theoretica
l Physics\, Kyoto University)\, Sinya Aoki\, HAL QCD Collaboration\n\nIn t
his talk\, we show the recent status of the rho resonance study in the HAL
QCD method.\nWe investigate the I=1 two-pion potential at $m_{\\pi} \\app
rox 411$ MeV by using a new calculation strategy\, namely the combination
of three techniques: the one-end trick\, the sequential propagator\, and c
ovariant approximation averaging (CAA).\nThanks to the new strategy\, we d
etermine the non-local I=1 two-pion potential 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 resonance.\nAs regards the resonance param
eters\, our resonance mass is consistent with the previous study using the
finite-volume method\, but slightly larger decay width and coupling are o
btained. We discuss possible origins of this difference.\n\nhttps://confer
ence-indico.kek.jp/event/113/contributions/2060/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2060/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Compton amplitude via the Feynman-Hellman theorem
DTSTART:20200807T072000Z
DTEND:20200807T074000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2079@conference-indico.kek.jp
DESCRIPTION:Speakers: R. Horsley\, P. E. L. Rakow\, (CSSM/UKQCD/QCDSF Coll
aborations)\, A. Hannaford-Gunn\, K. Y. Somfleth\, J. M. Zanotti\, H. Perl
t\, H. Stüben\, Y. Nakamura\, R. D. Young\, G. Schierholz\, K. Utku Can (
*) (University of Adelaide)\n\nIn this talk\, we highlight our group's rec
ent developments on computing the Compton amplitude in a lattice approach.
We briefly discuss how to access the Compton amplitude directly via the s
econd-order Feynman-Hellmann theorem. As an application\, we compute the n
ucleon Compton tensor across a range of photon momenta at an unphysical qu
ark 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 applications of this approach.\n\nhttps
://conference-indico.kek.jp/event/113/contributions/2079/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2079/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Preliminary Lattice Calculation of the Pion Light-Cone Distributio
n Amplitude via the Operator Product Expansion
DTSTART:20200807T052000Z
DTEND:20200807T054000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2095@conference-indico.kek.jp
DESCRIPTION:Speakers: William Detmold \, Robert Perry\, Santanu Mondal\, I
ssaku Kanamori\, C-J. David Lin\, HOPE Collaboration\, Yong Zhao\, Anthony
Grebe (*) (Massachusetts Institute of Technology)\n\nThe moments of the p
ion light-cone distribution amplitude (LCDA) can be extracted by compariso
n with the operator product expansion of the pion hadronic tensor with an
artificially heavy intermediate quark. We perform a preliminary lattice c
alculation of this hadronic tensor in the quenched approximation at multip
le lattice spacings and use it to extract the continuum limit of the secon
d moment of the pion LCDA. Our results are in agreement with other lattic
e calculations of the second moment\, illustrating the potential of this m
ethod.\n\nhttps://conference-indico.kek.jp/event/113/contributions/2095/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2095/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alternatives to Kogut-Susskind formulation for quantum computation
DTSTART:20200806T052000Z
DTEND:20200806T054000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2097@conference-indico.kek.jp
DESCRIPTION:Speakers: Junyu Liu\, Hrant Gharibyan\, Masazumi Honda\, Alex
Buser\, Masanori Hanada (Surrey)\n\nWhen the realizations of QFT on quantu
m computer are discussed\, the Kogut-Susskind formulation of lattice Hamil
tonian is a popular option. We provide alternative formulations and discus
s the pros and cons.\n\nhttps://conference-indico.kek.jp/event/113/contrib
utions/2097/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2097/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tensor renormalization group approach to four-dimensional complex
\\phi^4 theory at finite density
DTSTART:20200807T062000Z
DTEND:20200807T064000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2061@conference-indico.kek.jp
DESCRIPTION:Speakers: Takumi Yamashita\, Daisuke Kadoh\, Yoshinobu Kuramas
hi\, Yusuke Yoshimura\, Shinichiro Akiyama (*) (University of Tsukuba)\n\n
Tensor network is an attractive approach to field theory with \nnegative s
ign problem. The complex \\phi^4 theory at finite density is a test bed fo
r numerical algorithms to verify their effectiveness.\nThe model shows a c
haracteristic feature called the Silver Blaze phenomenon associated with t
he sign problem in the large volume limit at low temperature. We analyze t
he four-dimensional model employing the anisotropic tensor renormalizatio
n group algorithm. We find a clear signal of the Silver Blaze phenomenon o
n a large volume of V=1024^4\, which implies that the tensor network appro
ach is effective even for four-dimensional field theory beyond two dimensi
ons.\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:Magnetic Polarisability with the background Field Method
DTSTART:20200806T070000Z
DTEND:20200806T072000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2069@conference-indico.kek.jp
DESCRIPTION:Speakers: Ryan Bignell (*) (University of Adelaide)\, Waseem K
amleh\, Derek Leinweber\n\nThe magnetic polarisability is a fundamental pr
operty of hadrons\, which provides insight into their structure in the low
-energy regime. The pion magnetic polarisability is calculated using latti
ce QCD in the presence of background magnetic fields. The results presente
d are facilitated by the introduction of a new magnetic-field dependent qu
ark-propagator eigenmode projector and the use of the background-field cor
rected clover fermion action. The magnetic polarisabilities are calculated
in a relativistic formalism\, and the excellent signal-to-noise property
of pion correlation functions facilitates precise values.\n\nhttps://confe
rence-indico.kek.jp/event/113/contributions/2069/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2069/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fermion-Higgs composite state mass in a SU(2) Wilson-Yukawa model
DTSTART:20200804T072000Z
DTEND:20200804T074000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2059@conference-indico.kek.jp
DESCRIPTION:Speakers: Vincenzo Afferrante (*) (University of Graz)\, Axel
Maas\, Pascal Torek\n\nA correct non perturbative treatment of gauge theor
ies requires physical particles to be described by gauge invariant operato
rs. It is then appropriate to use composite operators made of elementary
gauge dependant fields as physical observables.\n\nhttps://conference-ind
ico.kek.jp/event/113/contributions/2059/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2059/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Visualisations of the non-trivial QCD vacuum
DTSTART:20200807T070000Z
DTEND:20200807T072000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2068@conference-indico.kek.jp
DESCRIPTION:Speakers: James Biddle (*) (Centre for the Subatomic Structure
of matter\, Department of Physics\, The University of Adelaide)\, Derek L
einweber\, Waseem Kamleh\n\nDespite the success of quantum chromodynamics
(QCD) in describing the strong nuclear force\, a clear picture of how this
theory gives rise to the distinctive properties of confinement and dynami
cal chiral symmetry breaking at low energy is yet to be found. One of the
more promising models used to explain these phenomena in recent times is k
nown 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 supporting the importance of centre vortices
in QCD. We also present novel visualisation techniques that have been dev
ised to allow for detailed hands-on exploration of the centre-vortex struc
ture of the QCD vacuum. These techniques provide new insight into the beha
viour of centre vortices in low-energy lattice QCD.\n\nhttps://conference-
indico.kek.jp/event/113/contributions/2068/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2068/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Maiani-Testa meets the inverse problem
DTSTART:20200806T072000Z
DTEND:20200806T074000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2075@conference-indico.kek.jp
DESCRIPTION:Speakers: Mattia Bruno (CERN)\, Maxwell T. Hansen\n\nIn their
seminal publication of 1990\, Maiani and Testa showed that Euclidean corre
lators are contaminated by off-shell contributions\, limiting a direct ext
raction of amplitudes away from threshold. In this presentation\, we revis
it and extend this work\, and explore the connection with recent developme
nts on the inverse problem in Lattice QCD.\n\nhttps://conference-indico.ke
k.jp/event/113/contributions/2075/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2075/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon electromagnetic form factors at large momenta using the Fe
ynman-Hellmann theorem
DTSTART:20200805T072000Z
DTEND:20200805T074000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2066@conference-indico.kek.jp
DESCRIPTION:Speakers: Mischa Batelaan (*) (University of Adelaide)\, James
Zanotti\, Ross Young\n\nThe hadronic form factors at large momentum trans
fers often suffer from substantial excited state contributions and poor si
gnal-to-noise ratios. Using the Feynman-Hellmann theorem allows for calcul
ations of the hadronic form factors which only rely on two-point functions
this allows access to higher momenta while still controlling the excited
state contributions. We will present results from our study of the electro
magnetic form factors of the nucleons up to approximately \\(9 \\textrm{ G
eV}^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 \\tex
trm{ MeV}\\)\, \\(360 \\textrm{ MeV}\\) and \\(310 \\textrm{ MeV}\\).\n\nh
ttps://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 from 2+1-flavor domain-wall fermions lattice QCD
DTSTART:20200805T082000Z
DTEND:20200805T084000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2149@conference-indico.kek.jp
DESCRIPTION:Speakers: Shigemi Ohta (IPNS\, KEK)\, LHP\, RBC\, UKQCD\n\nCur
rent status of LHP+RBC joint nucleon structure calculations using RBC+UKQC
D 2+1-flavor domain-wall fermions lattice-QCD ensembles is summarized.\n\n
https://conference-indico.kek.jp/event/113/contributions/2149/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2149/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Machine Learning and Histogram Reweighting: Detecting and Studying
Phase Transitions
DTSTART:20200805T080000Z
DTEND:20200805T082000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2064@conference-indico.kek.jp
DESCRIPTION:Speakers: Dimitrios Bachtis (*) (Swansea University)\, Gert Aa
rts\, Biagio Lucini\n\nWe present a synergistic approach between machine l
earning and histogram reweighting to discover and study phase transitions
in physical systems. We treat the output of a neural network\, designed fo
r phase classification\, as an observable in a statistical system enabling
its extrapolation over continuous ranges in parameter space using histogr
am reweighting. The approach\, which leads to quantitative results and ove
rcomes the need to understand the studied system in detail\, is applied to
the two-dimensional Ising model by training a convolutional neural networ
k to separate its symmetric and broken-symmetry phases. We further demons
trate that the Ising-trained neural network is sufficient to predict the p
hase transition in q-state Potts models and the $\\phi^4$ scalar field the
ory under a change of order\, universality class or the presence of contin
uous or discrete degrees of freedom. Finally\, we present calculations of
critical exponents and the critical coupling for the Ising model and the $
\\phi^4$ scalar field theory using a finite size scaling analysis on quant
ities derived entirely from the neural network implementation and their hi
stogram-reweighted extrapolations.\n\nhttps://conference-indico.kek.jp/eve
nt/113/contributions/2064/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2064/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Strategy of the Heavy quark Operator Product Expansion applied to
the Pion's Light Cone Distribution Amplitude
DTSTART:20200807T050000Z
DTEND:20200807T052000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2155@conference-indico.kek.jp
DESCRIPTION:Speakers: Will Detmold\, Anthony Grebe\, David Lin\, Yong Zhao
\, Issaku Kanamori\, Santanu Mondal\, Robert Perry (*) (National Chiao Tun
g University)\n\nThe Heavy quark Operator Product Expansion (HOPE) method
allows one to extract information about light-cone matrix elements via loc
al\, instant form matrix elements. When applied to the calculation of the
pion's light cone distribution amplitude\, it allows (in principle) the fu
ll x dependence of the distribution amplitude to be determined. In practic
e\, finite statistics and finite momenta mean that only a finite number of
moments may be extracted. In this talk\, I explain the HOPE method\, and
show how boosting the hadronic state leads to enhanced sensitivity to the
moments. I also discuss some kinematical tricks which enable us to extract
information about the second moment at much low momenta than would be nai
vely expected.\n\nhttps://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:Pseudoscalar-Photon Transition Form Factors from Twisted Mass Latt
ice QCD
DTSTART:20200807T082000Z
DTEND:20200807T084000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2077@conference-indico.kek.jp
DESCRIPTION:Speakers: Sebastian Burri (*) (University of Bern)\n\nWe repor
t on our computation of the pseudoscalar-photon transition form factors fr
om twisted mass lattice QCD for three pseudoscalar states\, i.e. the neutr
al pion and the eta and eta' mesons\, to determine the corresponding light
pseudoscalar pole contributions in the dispersive analysis of hadronic li
ght by light scattering in the muon g-2.\nThe neutral pion transition form
factor is computed directly at the physical point.\nWhile the eta and eta
' transition form factors are more numerically challenging than the one fo
r the neutral pion\, we present first results for the eta and eta' 3-point
amplitude 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:Multigrid methods for Chiral Fermions
DTSTART:20200804T052000Z
DTEND:20200804T054000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2072@conference-indico.kek.jp
DESCRIPTION:Speakers: Peter Boyle (Brookhaven National Laboratory)\, Azusa
Yamaguchi\n\nWe compare two of different methods for coarsening domain wa
ll fermions and discuss progress towards a multigrid method for DWF with t
he ability to set up and solve during gauge configuration generation.\n\nh
ttps://conference-indico.kek.jp/event/113/contributions/2072/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2072/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Determination of the charm quark mass from Nf = 2+1 QCD with Wilso
n fermions
DTSTART:20200806T050000Z
DTEND:20200806T052000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2071@conference-indico.kek.jp
DESCRIPTION:Speakers: Sjoerd Bouma (*) (University of Regensburg)\n\nWe ha
ve recently performed a determination of the charm quark mass on Nf = 2+1
CLS ensembles of non-perturbatively improved Wilson fermions. I will prese
nt the preliminary results of this analysis for the renormalization-group
invariant charm quark mass and the ratio m_c/m_s on these ensembles. The e
xtrapolation to the chiral and continuum limits is performed using 5 latti
ce spacings ranging roughly from 0.09 down to 0.04 fm and pion masses from
420 MeV to 130 MeV. The spatial extent of the ensembles is generally at l
east 4 / M_\\pi. In my talk\, I will discuss the various analysis strategi
es we considered\, including the fitting procedure\, corrections for the c
orrelations 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:Determination of $\\alpha_s$ in $N_f=3$ QCD from current-current c
orrelation functions in position space
DTSTART:20200806T052000Z
DTEND:20200806T054000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2078@conference-indico.kek.jp
DESCRIPTION:Speakers: Salvatore Calì (*) (Jagiellonian University)\, Jako
b Simeth\, Krzysztof Cichy\, Piotr Korcyl\n\nIn this talk\, we present a l
attice determination of the coupling constant $\\alpha_s$ in $N_f=3$ QCD f
or renormalization scales $\\mu\\in(1\,2)$ GeV.\nThe computation has been
performed on ensembles generated by the Coordinated Lattice Simulations (
CLS) consortium\, with tree-level Symanzik-improved gauge action and Wilso
n O(a)-improved fermions. Our approach is based on the study of current-cu
rrent correlation functions in position space and allows to determine $\\a
lpha_s$ (or alternatively the $\\Lambda$ parameter) with a competitive pre
cision.\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:Simplical Lattice Field Theory on de Sitter and anti de Sitter Man
ifolds
DTSTART:20200807T070000Z
DTEND:20200807T072000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2074@conference-indico.kek.jp
DESCRIPTION:Speakers: Richard Brower (Boston University)\n\nThe generaliza
tion of Lattice Field Theory targeting in curved Riemann manifolds referr
ed to as Quantum Finite Elements (QFE) requires geometrical tools.\nA brie
f outline for the construction of a Simplicial Complex and\nits Delaunay
dual\, the construction Finite Element of lattice action based on\nthe ele
gant Discrete Exterior Calculus (DEC) is given. The focus in on spheres an
d hyperbolic manifolds suited to radial quantization of conformal field th
eory and\nthe AdS/CFT correspondence respectively. The formalism aims to
construct simlicial\nactons for scalar\, Dirac and non-Abelian fields.\n\n
https://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:Lattice study of rotating gluodynamics
DTSTART:20200806T062000Z
DTEND:20200806T064000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2073@conference-indico.kek.jp
DESCRIPTION:Speakers: Victor Braguta (JINR)\, D.D. Kuznedelev\, A. Roenko\
, A.Yu. Kotov\n\nIn this report we present the results of lattice study of
how rotation influences confinement/deconfinement transition in SU(3) g
luodynamics. To conduct this study we pass to the reference frame which ro
tates with the system under consideration. In this reference frame rotatio
n is accounted for by the external gravitational field. We calculate the P
olyakov loop\, its susceptibility \nand determine the critical temperature
of the confinement/deconfinement transition for various angular velocitie
s. We find that rotation leads to rise of the critical temperature.\n\nht
tps://conference-indico.kek.jp/event/113/contributions/2073/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2073/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Finite volume effects and meson scattering in the 2-flavour Schwin
ger model
DTSTART:20200807T050000Z
DTEND:20200807T052000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2076@conference-indico.kek.jp
DESCRIPTION:Speakers: Patrick Bühlmann (*) (University of Bern)\, Urs Wen
ger\n\nWe investigate the two-flavour Schwinger model in the canonical for
mulation with fixed fermion number.\nWe use Wilson fermions on the lattice
and present a formalism which describes the Dirac operator with dimension
ally reduced canonical operators.\nThese reduced operators allow the direc
t examination of different meson sectors and the determination of the ener
gy spectrum in\neach of the sectors. Using Lüscher's finite-volume mass-s
hift 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 shi
fts and compare the 3-meson energies in the finite volume to various\npred
ictions based on scattering theory.\n\nhttps://conference-indico.kek.jp/ev
ent/113/contributions/2076/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2076/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Welcome and instructions
DTSTART:20200804T045000Z
DTEND:20200804T050000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-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:P-wave form factors from the inclusive semileptonic $B \\ rightarr
ow X_c \\ell \\nu$ decays
DTSTART:20200804T082000Z
DTEND:20200804T084000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2065@conference-indico.kek.jp
DESCRIPTION:Speakers: Gabriela Bailas (*) (KEK)\, T. Kaneko\, S. Hashimoto
\n\nWe report our estimation for the Isgur-Wise form factors for the inclu
sive 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 a
nd bottom quarks. The structure function receives contributions from vario
us exclusive modes\, including the dominant S-wave states $D^{(*)}_s$ as w
ell as the P-wave states $D_s^{**}$. In this work\, we identify and separa
te these contributions in the lattice data\, from \nwhich we put some cons
traints on the $B_s \\to D_s^{**}\\ell\\nu$ form factors. Our work takes i
nto account the structure functions for the cases of zero-recoil and non-z
ero recoil.\n\nhttps://conference-indico.kek.jp/event/113/contributions/20
65/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2065/
END:VEVENT
BEGIN:VEVENT
SUMMARY:*** CANCELLED*** Extending Lattice H2 to AdS3
DTSTART:20200805T054000Z
DTEND:20200805T060000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2084@conference-indico.kek.jp
DESCRIPTION:Speakers: Cameron Cogburn (*) (Boston University)\, Cameron V.
Cogburn\, Richard C. Brower\n\nIn a recent work\, we describe and quantif
y a method for setting up a lattice for quantum field theory in AdS2 based
on the triangle group\, which enables maximally symmetric tilings of hype
rbolic space. Here we extend this lattice setup to the AdS3 cylinder via H
amiltonian methods\, enabling us to study dynamical systems. We verify bas
ic properties of this discretized Euclidean AdS3 space with the continuum\
, such as propagators and the four-point function. For the latter\, using
a ``conformal center of mass frame" we are able to make the kinematic vari
ables of the configuration conformal\, providing a convenient framework fo
r further study.\n\nhttps://conference-indico.kek.jp/event/113/contributio
ns/2084/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2084/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Radial Lattice Quantization of 3D $\\phi^4$ Field Theory
DTSTART:20200806T050000Z
DTEND:20200806T052000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2093@conference-indico.kek.jp
DESCRIPTION:Speakers: Andrew Gasbarro (*) (University of Bern)\, Richard B
rower\, George Fleming\n\nWe present numerical results for 3d $\\phi^4$ fi
eld theory on the $R\\times S^2$ manifold in radial quantization using the
quantum extension of the finite element method (QFE). The Monte Carlo stu
dy supports the QFE ansatz that once counterterms cancel effects from geom
etric defects in the UV\, one reaches the nonperturbative conformal fixed
point of the 3d Ising CFT. We demonstrate that including the Ricci curvatu
re term for an improved lattice action drastically accelerates the approac
h to the continuum limit\, opening the way for high precision calculation
of scaling dimensions\, OPE couplings\, 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:D to K semileptonic decay from n_f = 2 + 1 + 1 lattice QCD with ph
ysical light quarks
DTSTART:20200805T072000Z
DTEND:20200805T074000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2081@conference-indico.kek.jp
DESCRIPTION:Speakers: W. Parrott\, J. Koponen\, G. P. Lepage\, [HPQCD]\, C
. T. H. Davies\, Bipasha Chakraborty (*) (University of Cambridge)\n\nWe p
resent our (HPQCD) latest lattice QCD calculation of the scalar and the ve
ctor form factors for the D → Klν semi-leptonic decay over a full range
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 ligh
t quark masses.This calculation allows us to precisely determine the centr
al CKM matrix element\, V_{cs} in the Standard Model\, by comparing the la
ttice 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:$B_c \\rightarrow J/\\psi$ Semileptonic Form Factors and $R(J/\\ps
i)$ Using the Heavy-HISQ Method
DTSTART:20200805T080000Z
DTEND:20200805T082000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2098@conference-indico.kek.jp
DESCRIPTION:Speakers: Judd Harrison (*) (University of Glasgow)\, Christin
e Davies\, HPQCD\, Andrew Lytle\n\nWe present the results of HPQCD's recen
t calculation of the $B_c \\rightarrow J/\\psi$ semileptonic form factors
and $R(J/\\psi)$ for the first time from lattice QCD using the heavy-HISQ
method. We also extend these results to angular observables which we compu
te in the standard model and in several new physics scenarios.\n\nhttps://
conference-indico.kek.jp/event/113/contributions/2098/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2098/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Finite-volume scattering formalism for all three-pion isospin chan
nels
DTSTART:20200804T050000Z
DTEND:20200804T052000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2196@conference-indico.kek.jp
DESCRIPTION:Speakers: Maxwell Hansen (CERN)\n\nI summarize recent work (ar
Xiv:2003.10974) providing a generalization of finite-volume scattering for
malism for non-identical pions in isosymmetric QCD. The result allows one
to use discrete finite-volume energies\, determined using lattice QCD\, to
constrain scattering amplitudes for all possible values of two- and three
-pion 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\nht
tps://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:Conformal magnetic effect in scalar QED
DTSTART:20200807T050000Z
DTEND:20200807T052000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2083@conference-indico.kek.jp
DESCRIPTION:Speakers: Maxim Chernodub (Institut Denis Poisson\, CNRS)\, A.
V. Molochkov\, V. A. Goy\n\nQuantum polarization effects associated with
the conformal anomaly in a static magnetic field background may generate a
transverse electric current in the vacuum of massless particles (either b
osons or fermions). The current may be produced either in an unbounded cur
ved spacetime or in flat spacetime in a physically bounded system. In both
cases\, the magnitude of the electric current is proportional to the beta
-function associated with the renormalization of electric charge. We inves
tigate the electric current density induced by the magnetic field in the v
icinity of a Dirichlet boundary in lattice scalar QED. We show that the el
ectric current\, generated by this "conformal magnetic effect at the edge"
(CMEE)\, is well described by the conformal anomaly in the symmetry--unbr
oken phase. In the symmetry--broken phase\, the anomalous current becomes
the usual Meissner current generated by the superconducting condensate.\n\
nhttps://conference-indico.kek.jp/event/113/contributions/2083/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2083/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The effects of fermions in the complex Langevin simulation of the
Lorentzian type IIB matrix model
DTSTART:20200805T052000Z
DTEND:20200805T054000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2099@conference-indico.kek.jp
DESCRIPTION:Speakers: Jun Nishimura\, Yuta Ito\, Mitsuaki Hirasawa\, Takeh
iro Azuma\, Konstantinos N. Anagnostopoulos\, Asato Tsuchiya\, Stratos Kov
alkov Papadoudis\, Kohta HATAKEYAMA (*) (KEK)\n\nThe type IIB matrix model
was proposed as a nonperturbative formulation of superstring theory. In p
articular\, interesting results such as the emergence of (3+1)D exponentia
lly expanding space-time have been obtained from the Lorentzian version of
the model. Recently the complex Langevin simulation of the bosonic model
has been performed to avoid the previously used approximation in overcomin
g the sign problem. In this talk\, we include the effects of fermions in t
his 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:Machine learning study on the Dirac eigenvalue spectrum of stagger
ed quarks
DTSTART:20200804T062000Z
DTEND:20200804T064000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2125@conference-indico.kek.jp
DESCRIPTION:Speakers: Jangho Kim\, Chulwoo Jung\, Weonjong Lee\, Jeehun Ki
m\, Youngjo Lee\, Sunghee Kim\, Seungyeob Jwa\, Nam Soo Kim\, Hwancheol Je
ong\, Jeonghwan Pak\, Sunkyu Lee (*) (Seoul National University)\n\nWe stu
dy chirality of staggered quarks on the Dirac eigenvalue spectrum using ma
chine learning technique. As a result of theoretical research\, we expect
a characteristic pattern\, we call leakage pattern\, in the matrix element
s of the chirality operator sandwiched between two eigenstates of staggere
d Dirac operator. Machine learning analysis gives 98.7(34)% accuracy per a
single normal gauge configuration for classifying non-zero mode quartets
in Dirac eigenvalue spectrum. It confirms that the leakage pattern is univ
ersal on normal gauge configurations. We choose the multi-layer perceptron
(MLP) method which is one of the deep learning models. It happens to give
the best performance in our study. The model's prediction is compared wit
h other models'\, such as XGboost. Numerical study is done using HYP stagg
ered quarks on the $20^4$ lattice in quenched QCD.\n\nhttps://conference-i
ndico.kek.jp/event/113/contributions/2125/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2125/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Grand Canonical Distribution from LQCD for experiment data analysi
s
DTSTART:20200804T060000Z
DTEND:20200804T062000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2094@conference-indico.kek.jp
DESCRIPTION:Speakers: D. Boyda\, A. Molochkov\, V. Bornyakov\, A. Nakamura
\, Vladimir Goy (Far Eastern Federal University)\n\nWe propose new way of
heavy ion collisions experiment data analysis. We analyze physical paramet
ers of fireball created in RHIC experiment based on Grand Canonical Distri
bution and different Lattice QCD data available at the moment. Our results
on chemical potential are in agreement with previous model estimations an
d do not depend on Lattice setup. At same time\, we found possible T(V) st
ates of fireball and estimated the most probable temperature and volume of
fireball as function of collision energy.\n\nhttps://conference-indico.ke
k.jp/event/113/contributions/2094/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2094/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice QCD calculation of the pion charge radius using a model-in
dependent method
DTSTART:20200805T060000Z
DTEND:20200805T062000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2089@conference-indico.kek.jp
DESCRIPTION:Speakers: Yang Fu (*) (Peking University)\, Xu Feng\, Lu-Chang
Jin\n\nWe use a method to calculate the hadron's charge radius without mo
del-dependent momentum extrapolations. The method does not require the add
itional quark propagator inversions on the twisted boundary conditions or
the computation of the momentum derivatives of quark propagators and thus
is easy to implement. We apply this method to the calculation of pion char
ge radius ⟨r^2⟩. For comparison\, we also determine ⟨r^2⟩ with the
traditional approach of computing the slope of the form factors. The new
method produces results consistent with those from the traditional method
and with statistical errors 1.5-1.9 times smaller. For the four gauge ense
mbles at the physical pion masses\, the statistical errors of ⟨r^2⟩ ra
nge from 2.1% to 4.6% by using ≲50 configurations. For the ensemble at m
_π≈340 MeV\, the statistical uncertainty is even reduced to a sub-perce
nt level.\n\nhttps://conference-indico.kek.jp/event/113/contributions/2089
/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2089/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$B_{(s)}-\\bar{B}_{(s)}$ mixing on domain-wall lattices
DTSTART:20200805T060000Z
DTEND:20200805T062000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2088@conference-indico.kek.jp
DESCRIPTION:Speakers: Felix Erben (*) (University of Edinburgh)\, Justus T
obias Tsang\n\nWe are presenting 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 dynamical-flavour domain wall fermions\, including phys
ical-pion-mass ensembles. We are simulating a range of heavy quark masses
on each ensemble from below the charm quark mass towards (but still below)
the bottom quark mass. The plan for this study is to perform a full conti
nuum limit allowing us to get an independent determination of the CKM matr
ix elements $|V_{ts}|$ and $|V{td}|$\, which will help to test whether the
CKM matrix is indeed unitary.\n\nhttps://conference-indico.kek.jp/event/1
13/contributions/2088/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2088/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sign problem and the tempered Lefschetz thimble method
DTSTART:20200805T070000Z
DTEND:20200805T072000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2091@conference-indico.kek.jp
DESCRIPTION:Speakers: Masafumi Fukuma (Kyoto University)\, Naoya Umeda\, N
obuyuki Matsumoto\n\nTempered Lefschetz thimble method (TLTM) [Fukuma-Umed
a(1703.00861)] is an algorithm towards solving the numerical sign problem.
There\, the integration region is deformed into the complex space followi
ng the antiholomorphic gradient flow equation\, and the system is parallel
-tempered using the flow time as a tempering parameter so as to solve both
sign and ergodicity problems simultaneously. In this talk\, I explain the
basics of the algorithm\, and discuss its application to various models\,
including the Thirring model\, the Hubbard model away from half filling\,
and the theta vacuum with finite theta. An application to a chiral matrix
model (a toy model of finite density QCD) will be discussed by Nobuyuki M
atsumoto in his talk.\n\nhttps://conference-indico.kek.jp/event/113/contri
butions/2091/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2091/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hybrid static potentials at small quark-antiquark separations
DTSTART:20200807T054000Z
DTEND:20200807T060000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2159@conference-indico.kek.jp
DESCRIPTION:Speakers: Carolin Riehl (*) (Goethe University Frankfurt)\, Ma
rc Wagner\n\nWe compute hybrid static potentials in SU(2) lattice gauge th
eory using a multilevel algorithm and three different small lattice spacin
gs. The resulting static potentials\, which are valid for quark-antiquark
separations as small as 0.05 fm\, are important e.g. when computing masses
of heavy hybrid mesons in the Born-Oppenheimer approximation. We also dis
cuss and exclude possible systematic errors from topological freezing\, th
e 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:Vacuum Restructuring in Finite Geometries: Nonperturbative Casimir
Effects in Lattice Gauge Theories
DTSTART:20200805T062000Z
DTEND:20200805T064000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2140@conference-indico.kek.jp
DESCRIPTION:Speakers: Alexander Molochkov (Pacific Quantum Center\, Far Ea
stern Federal University)\, Maxim Chernodub\, Vladimir Goy\, Alexey Tanash
kin\n\nThe Casimir effect is a quantum phenomenon rooted in the fact that
vacuum fluctuations of quantum fields are affected by physical objects and
boundaries. As the energy spectrum of vacuum fluctuations depends on dist
ances between (and geometries of) physical bodies\, the quantum vacuum exe
rts a small but experimentally detectable force on neutral objects. Usuall
y\, the associated Casimir energy is calculated for free 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 t
he Casimir boundaries on the chiral and deconfining phase transitions and
the mass-scales.\n\nhttps://conference-indico.kek.jp/event/113/contributio
ns/2140/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2140/
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:20200804T054000Z
DTEND:20200804T060000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2194@conference-indico.kek.jp
DESCRIPTION:Speakers: S.-T. Li\, Swagato Mukherjee\, H.-T. Ding\, X.-D. Wa
ng\, A. Tomiya\, Yu Zhang (*) (Central China Normal University)\n\nWe will
present results on the Dirac eigenvalue spectrum as well as its relation
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 st
aggered quarks (HISQ) action on Nτ = 8\, 12 and 16 lattices with the aspe
ct ratio Nσ /Nτ in a range of [4\,9] and 4-5 pion masses ranging from 16
0 MeV to 55 MeV at a single temperature of ∼ 200 MeV.\n\nhttps://confere
nce-indico.kek.jp/event/113/contributions/2194/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2194/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The dual Meissner effect due to the violation of non-Abelian Bianc
hi identity
DTSTART:20200806T082000Z
DTEND:20200806T084000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2102@conference-indico.kek.jp
DESCRIPTION:Speakers: Atsuki Hiraguchi (*) (Kochi University)\, Katsuya Is
higuro\, Tsuneo Suzuki\n\nQuark confinement is still an unsolved problem.
The dual Meissner effect is one of the ideas of this mechanism. In this pi
cture\, it is considered that the color flux tube between quarks is caused
by the condensation of monopole in the QCD vacuum. However\, how to defin
e monopole in QCD is a difficult problem. Recently\, it was shown the viol
ation of non-Abelian Bianchi identity is equal to Abelian-like monopole cu
rrents. In this talk\, we show numerical results of the dual Meissner effe
ct due to these monopole currents.\n\nhttps://conference-indico.kek.jp/eve
nt/113/contributions/2102/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2102/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Semileptonic $B\\to\\pi\\ell\\nu$ decays
DTSTART:20200805T084000Z
DTEND:20200805T090000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2101@conference-indico.kek.jp
DESCRIPTION:Speakers: Justus Tobias Tsang\, Andreas Juettner\, Oliver Witz
el\, Amarjit Soni\, Jonathan Flynn\, Ryan Hill (*) (University of Southamp
ton)\n\nThe desire for additional determinations of the CKM matrix element
$V_{ub}$ and a long-standing 2-3$\\sigma$ discrepancy between results fro
m inclusive $B\\to X_u$ and exclusive $B\\to\\pi$ processes motivate the s
tudy of $B\\to\\pi$ semileptonic form factors on the lattice. The status o
f our preliminary $B\\to\\pi\\ell\\nu$ results will be discussed by highli
ghting 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 simul
ated using the Columbia formulation of the relativistic heavy quark action
\, and the light valence-quarks simulated with domain wall fermions. The f
inal results of this project will provide updates to the 2015 RBC/UKQCD $B
\\to\\pi\\ell\\nu$ result.\n\nhttps://conference-indico.kek.jp/event/113/c
ontributions/2101/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2101/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Digital Quantum Simulation of the Schwinger Model with Theta Term
via Adiabatic State Preparation
DTSTART:20200806T054000Z
DTEND:20200806T060000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2104@conference-indico.kek.jp
DESCRIPTION:Speakers: Bipasha Chakraborty\, Akio Tomiya\, Yuta Kikuchi\, T
aku Izubuchi\, Masazumi Honda (Yukawa Institute for Theoretical Physics)\n
\nWe perform a digital quantum simulation of the Schwinger model with the
theta term\, which is practically inaccessible by standard lattice Monte C
arlo simulations. We construct the true vacuum state of a lattice Schwinge
r model using adiabatic state preparation which\, in turn\, allows us to c
ompute an expectation value of the fermion mass operator with respect to t
he vacuum. Upon taking a continuum limit we find that our result in massle
ss case agrees with the known exact result. In massive case\, we find an a
greement with mass perturbation theory in small mass regime and deviations
in large mass regime. We estimate computational costs required to take 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:Gell-Mann-Oakes-Renner relation in external magnetic fields at zer
o temperature
DTSTART:20200806T052000Z
DTEND:20200806T054000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2182@conference-indico.kek.jp
DESCRIPTION:Speakers: X.-D. Wang\, S.-T. Li\, H.-T. Ding\, A. Tomiya\, Y.
Zhang\, Xiao-Dan Wang (*) (Central China Normal University)\n\nWe present
results of chiral condensates\, masses and decay constants of neutral pseu
do scalar mesons in (2+1)-flavor QCD in the presence of external magnetic
fields at zero temperature. We discuss the validity of Gell-Mann-Oakes-Ren
ner relation in a wide region of magnetic field strength $eB$ up to around
3.5 GeV$^2$. The simulations were performed on $32^3\\times96$ lattices
using the Highly Improved Staggered Quarks (HISQ) action with a single la
ttice cutoff $a$=0.117 fm and $m_\\pi\\approx$ 220 MeV. Sixteen values of
$eB$ along the $z$ direction up to around 3.5 GeV$^2$ have been applied in
the simulation.\n\nhttps://conference-indico.kek.jp/event/113/contributio
ns/2182/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2182/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Casimir energy for the domain-wall fermion
DTSTART:20200807T052000Z
DTEND:20200807T054000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2145@conference-indico.kek.jp
DESCRIPTION:Speakers: Katsumasa Nakayama (*) (DESY)\, Tsutomu Ishikawa\, K
ei Suzuki\n\nWe investigate Casimir energy for free fermions on the lattic
e.\nThe Casimir energy of fermion fields can be defined with the lattice r
egularization.\nThe continuum extrapolation of our results reproduces the
Casimir energy known in continuum theory.\nWe also show the lattice effect
for the Casimir energy.\nThe lattice effect is important as an artifact t
hat should be well-understood in order to perform reliable lattice simulat
ions with a small volume in particle physics.\nOn the other hand\, the lat
tice effects can appear in materials such as topological insulators in con
densed 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.jp/event/113/contributions/2145/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2145/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Space-time structure in the Lorentzian type IIB matrix model in th
e large-N limit
DTSTART:20200805T060000Z
DTEND:20200805T062000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2103@conference-indico.kek.jp
DESCRIPTION:Speakers: Asato Tsuchiya\, Jun Nishimura\, Kohta Hatakeyama\,
Yuta Ito\, Konstantinos N. Anagnostopoulos\, Stratos Kovalkov Papadoudis\,
Takehiro Azuma\, Mitsuaki Hirasawa (*) (SOKENDAI)\n\nThe Lorentzian type
IIB matrix model is a promising candidate for a non-perturbative formulati
on of superstring theory. In the previous work\, Monte Carlo calculations
provided interesting results indicating the spontaneous breaking of SO(9)
to SO(3) and the emergence of (3+1)-dimensional space-time. There\, an app
roximation was used to avoid the sign problem\, however. In this talk\, we
report our results obtained by using the complex Langevin method to overc
ome the sign problem instead of using the approximation. In particular\, w
e discuss the space-time structure in the large-N limit based on our resul
ts obtained for large matrix size.\n\nhttps://conference-indico.kek.jp/eve
nt/113/contributions/2103/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2103/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Abelian and monopole dominance without gauge fixing in pure SU(3)
gauge theory
DTSTART:20200806T080000Z
DTEND:20200806T082000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2106@conference-indico.kek.jp
DESCRIPTION:Speakers: Katsuya Ishiguro (Kochi University)\, Tsuneo Suzuki
\, Atsuki Hiraguchi\n\nUnderstanding the color confinement mechanism is no
t yet solved in QCD. The dual Meissner effect is one of the most promising
pictures as the color confinement mechanism. Recently the dual Meissner p
icture due to violation of the non-Abelian Bianchi identities was proposed
. In this talk\, we show numerical results based on that picture in pure S
U(3) gauge theory\, especially almost perfect Abelian dominance and monopo
le dominance for the static q-qbar potential without gauge fixing.\n\nhttp
s://conference-indico.kek.jp/event/113/contributions/2106/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2106/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QCD at nonzero temperature and density
DTSTART:20200807T084000Z
DTEND:20200807T090000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2148@conference-indico.kek.jp
DESCRIPTION:Speakers: Akira Ohnishi (Yukawa Institute for Theoretical Phys
ics\, Kyoto University)\, Hidefumi Matsuda\, Toru T. Takahashi\, Teiji Kun
ihiro\n\nReplica evolution of classical field is proposed as an approximat
e 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 interact with each
other via the $\\tau$-derivative terms and evolve with the classical equat
ion of motion. The $\\tau$-derivative terms in the Hamiltonian\, $\\xi^2 \
\sum_x (\\phi_{x+\\hat{\\tau}}-\\phi_x)^2/2$\, correspond to the kinetic p
art of the Euclidean action in the imaginary time formalism of the finite
temperature quantum field theory by regarding the replica index $\\tau$ as
the imaginary time index.Thus the replica evolution is technically the sa
me as the molecular dynamics part of the hybrid Monte-Carlo sampling. The
partition function of replicas at temperature $\\xi$ is proven to be propo
rtional to that in quantum field theory at temperature $T=\\xi/N$. At the
same time\, the time dependence of the replica-index average of field vari
ables is described by the classical equation of motion when the fluctuatio
ns are small. We examine the statistical and dynamical properties of the $
\\phi^4$ theory in the 4+1 spacetime dimensions. We note that the Rayleigh
-Jeans divergence in the classical field can be removed in replica evoluti
on with $N \\geq 2$ by including the mass counterterm. We also find that t
he thermal mass obtained from the unequal time correlation function at zer
o momentum grows as a function of the coupling as in the perturbative esti
mate in the small coupling region. Hence the replica evolution\, the class
ical field theory with improved quantum statistical property\, 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:A better conditioned Domain Wall Operator
DTSTART:20200804T050000Z
DTEND:20200804T052000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2146@conference-indico.kek.jp
DESCRIPTION:Speakers: Hartmut Neff\n\nA variation of the Domain Wall opera
tor with an additional parameter α will be introduced. The conditioning o
f the new Domain Wall operator depends on α\, whereas the corresponding 4
D propagator does not. The new and the conventional Domain Wall operator a
gree 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/11
3/contributions/2146/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2146/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bottomonium resonances from lattice QCD static-static-light-light
potentials
DTSTART:20200804T072000Z
DTEND:20200804T074000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2142@conference-indico.kek.jp
DESCRIPTION:Speakers: Lasse Mueller\, Nuno Cardoso\, Pedro Bicudo\, Marc W
agner\, Lasse Mueller (*) (Goethe University Frankfurt)\n\nWe study I = 0
quarkonium resonances decaying into pairs of heavy-light mesons using stat
ic-static-light-light potentials from lattice QCD. To this end\, we solve
a coupled channel Schrödinger equation with one confined quarkonium chann
el and two channels with a heavy-light meson pair to compute phase shifts
and t-matrix poles for the lightest decay channel. Finally\, we discuss ou
r 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:Reaching high momenta using Distillation.
DTSTART:20200807T070000Z
DTEND:20200807T072000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2158@conference-indico.kek.jp
DESCRIPTION:Speakers: HadStruct Collaboration.\, Colin Egerer\, Robert Edw
ards\, Kostas Orginos\, David Richards (Jefferson Lab)\n\nThe need to reac
h high hadron momentum is key to calculations of Parton Distribution Funct
ions and other measures of hadron structure within lattice QCD. Meanwhile
\, the distillation framework provides a valuable means both of more fully
sampling the lattice\, and of controlling the contribution of excited sta
tes. In this talk\, we extend the distillation framework through the imple
mentation of the so-called momentum-smearing method\, and show that it all
ows a major improvement in the determination of the energies of the nucleo
n in motion. We then apply the method to the extraction of the Nucleon Ch
arges 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:QCD sum rule from lattice correlators
DTSTART:20200806T060000Z
DTEND:20200806T062000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2107@conference-indico.kek.jp
DESCRIPTION:Speakers: Tsutomu Ishikawa (*) (KEK\, SOKENDAI)\, JLQCD Collab
oration\, S. Hashimoto\n\nWe propose a method to compute a spectral sum ap
pearing in the QCD sum rule from lattice correlators. \nThis spectral sum
corresponds to the Borel transform of the vacuum polarization\, which wide
ly appears in the phenomenological study. \nWe discuss how to compute it f
rom two-point correlation functions on the lattice. \nWe measure it for th
ree lattice spacing and confirm that the method gives results consistent w
ith operator product expansion.\n\nhttps://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:Dark matter and gravitational waves
DTSTART:20200804T054000Z
DTEND:20200804T060000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2160@conference-indico.kek.jp
DESCRIPTION:Speakers: D. Schaich\, G. T. Fleming\, K. Cushman\, A. Hasenfr
atz\, C. Rebbi\, A. Gasbarro\, P. Vranas\, X. Y. Jin\, R. C. Brower\, G. D
. Kribs\, O. Witzel\, J. C. Osborn\, E. T. Neil\, Enrico Rinaldi (RIKEN)\n
\nWith non-perturbative lattice calculations we investigate the finite-tem
perature confinement transition of a composite dark matter model. We focus
on the regime in which this early-universe transition is first order and
would generate a stochastic background of gravitational waves. Future sear
ches for stochastic gravitational waves will provide a new way to discover
or constrain composite dark matter\, in addition to direct-detection and
collider experiments. As a first step to enabling this phenomenology\, we
determine how heavy the dark fermions need to be in order to produce a fir
st-order stealth dark matter confinement transition.\n\nhttps://conference
-indico.kek.jp/event/113/contributions/2160/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2160/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Double-winding Wilson loops towards flux tube interaction in SU(N)
lattice gauge theory
DTSTART:20200807T072000Z
DTEND:20200807T074000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2115@conference-indico.kek.jp
DESCRIPTION:Speakers: Seikou Kato (Oyama National College of Technology)\,
Kei-Ichi Kondo (Chiba Univ.)\, Akihiro Shibata (KEK)\n\nWe study ""shifte
d"" double-winding Wilson loop average in SU(N) lattice Yang-Mills theory
by using both strong coupling expansions and numerical simulations.\nWe ev
aluate its average by changing the distance of a transverse direction. \nF
rom this result\, we discuss how interactions between the two color flux t
ubes change\, when the distance $R$ is varied.\n\nhttps://conference-indic
o.kek.jp/event/113/contributions/2115/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2115/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gluon Field Digitization for Quantum Computers
DTSTART:20200806T060000Z
DTEND:20200806T062000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2123@conference-indico.kek.jp
DESCRIPTION:Speakers: Henry Lamm (*) (Fermilab)\, NuQS Collaboration\n\nTh
e efficient digitization required for the quantum simulations of QCD can b
e obtained by approximating continuous SU(3) gluon fields by discrete subg
roups. In this talk\, we discuss on-going efforts to develop this program
of digitization: deriving improved discrete group lattice actions\, classi
cal simulations for quantifying systematic errors\, and implementable circ
uits for digital quantum computers.\n\nhttps://conference-indico.kek.jp/ev
ent/113/contributions/2123/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2123/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon and Pion Ioffe time pseudo-distributions
DTSTART:20200807T080000Z
DTEND:20200807T082000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2114@conference-indico.kek.jp
DESCRIPTION:Speakers: Alexander Rothkopf\, Anatoly Radyushkin\, Raza Sufia
n\, Robert Edwards\, Colin Egerer\, Kostas Orginos\, David Richards\, Savv
as Zafeiropoulos\, Joseph Karpie (*) (Columbia University)\n\nThe light-co
ne definition of Parton Distribution Functions (PDFs) does not allow for a
direct ab initio determination employing methods of Lattice QCD simulatio
ns that naturally take place in Euclidean spacetime. In this presentation
we focus on pseudo-PDFs where the starting point is the equal time hadroni
c matrix element with the quark and anti-quark fields separated by a finit
e distance. We focus on Ioffe-time distributions\, which are functions of
the Ioffe-time ν\, and can be understood as the Fourier transforms of par
ton distribution functions with respect to the momentum fraction variable
x. We present lattice results for the case of the nucleon and the pion\, w
e discuss several lattice systematics and we also perform a comparison wit
h the pertinent phenomenological determinations\n\nhttps://conference-indi
co.kek.jp/event/113/contributions/2114/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2114/
END:VEVENT
BEGIN:VEVENT
SUMMARY:B->D(*)\\ell\\nu form factors from relativistic lattice QCD
DTSTART:20200805T074000Z
DTEND:20200805T080000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2113@conference-indico.kek.jp
DESCRIPTION:Speakers: JLQCD Collaboration\, B. Colquhoun\, G. Bailas\, S.
Hashimoto\, H. Fukaya\, Y. Aoki\, J. Koponen\, Takashi KANEKO (KEK)\n\nWe
report on our calculation of the B->D(*)\\ell\\nu form factors in 2+1 flav
or 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 the bottom quark masses up to 0.7 a^{-1}. We dis
cuss the extrapolation of the form factors to the continuum limit and phys
ical quark masses.\n\nhttps://conference-indico.kek.jp/event/113/contribut
ions/2113/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2113/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Connecting Matrix Elements to Multi-Hadron Form-Factors
DTSTART:20200806T074000Z
DTEND:20200806T080000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2109@conference-indico.kek.jp
DESCRIPTION:Speakers: Keegan Sherman\, Felipe Ortega-Gama\, Raul Briceno\,
Maxwell Hansen\, Andrew Jackura (*) (Old Dominion University and Jefferso
n Lab)\n\nWe review developments in calculating multi-hadron form-factors
and transition processes via lattice QCD. Our primary tools are finite-vol
ume scaling relations\, which non-perturbatively map spectra and matrix el
ements to their corresponding infinite-volume amplitudes. We focus on two
hadron processes probed by an external current\, and provide various check
s on the finite-volume formalism in the limiting cases of perturbative int
eractions and systems forming a bound state. Additionally\, we study model
-independent properties of their corresponding infinite-volume amplitudes\
, allowing us to rigorously define form-factors of resonating systems and
amplitudes useful for BSM physics.\n\nhttps://conference-indico.kek.jp/eve
nt/113/contributions/2109/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2109/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bayesian Model Averaging
DTSTART:20200805T074000Z
DTEND:20200805T080000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2110@conference-indico.kek.jp
DESCRIPTION:Speakers: William Jay (*) (Fermilab)\, Ethan Neil\n\nStatistic
al modeling plays a key role in lattice field theory calculations. Example
s including extracting masses from correlation functions or taking the chi
ral-continuum limit of a matrix element. We discuss the method of model av
eraging\, a way to account for uncertainty due to model variations\, from
the perspective of Bayesian statistics. Statistical formulas are derived f
or model-averaged expectation values and for estimating the required model
probability weights. In addition\, we reframe the common problem of data
subset selection (e.g. choice of minimum time separation for fitting a two
-point correlation function) as a model selection problem and study model
averaging as a universal alternative to hand tuning of fit ranges.\n\nhttp
s://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:Implementation of neighboring communication in QWS
DTSTART:20200804T072000Z
DTEND:20200804T074000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2112@conference-indico.kek.jp
DESCRIPTION:Speakers: Issaku Kanamori (RIKEN)\n\nAs parallel systems becom
e massive\, the neighboring communication in lattice QCD becomes more and
more important.\nIn this talk\, I will focus on the implementation of neig
hboring communication in QCD Wide SIMD library (QWS) for the supercomputer
Fugaku.\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 interfac
e for the TofuD interconnect.\nThe wrapper part is independent from the ot
her part of QWS and can be used from the other applications. As an exampl
e\, we use it in solving 2-dimensional Poisson equation.\n\nhttps://confer
ence-indico.kek.jp/event/113/contributions/2112/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2112/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sigma-Lambda state mixing from lattice QCD+QED
DTSTART:20200806T082000Z
DTEND:20200806T084000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2120@conference-indico.kek.jp
DESCRIPTION:Speakers: Zeno Kordov (*) (The University of Adelaide)\, CSSM/
QCDSF/UKQCD\n\nMixing in the $\\Sigma^0$--$\\Lambda^0$ system is a direct
consequence of broken isospin symmetry and is a measure of both isospin-sy
mmetry breaking as well as general SU(3)-flavour symmetry breaking. In thi
s talk we present a novel scheme for calculating the extent of the physica
l $\\Sigma^0$--$\\Lambda^0$ mixing using simulations in lattice QCD+QED an
d discuss some of its features and initial results.\n\nhttps://conference-
indico.kek.jp/event/113/contributions/2120/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2120/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Anisotropic pressure induced by finite-size effects at nonzero tem
perature in SU(3) Yang-Mills theory
DTSTART:20200804T074000Z
DTEND:20200804T080000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2117@conference-indico.kek.jp
DESCRIPTION:Speakers: Masakiyo Kitazawa (Osaka University)\, Sylvain Mogli
acci\, W.A. Horowitz\, Isobel Kolbé\n\nWe study the pressure anisotropy i
n anisotropic finite-size systems in SU(3) Yang-Mills theory at nonzero te
mperature. Lattice simulations are performed on lattices with anisotropic
spatial volumes with periodic boundary conditions. The energy-momentum ten
sor defined through the gradient flow is used for the analysis of the stre
ss tensor on the lattice. We find that a clear finite-size effect in the p
ressure anisotropy is observed only at a significantly shorter spatial ext
ent compared with the free scalar theory\, even when accounting for a rath
er large mass in the latter.\n\nhttps://conference-indico.kek.jp/event/113
/contributions/2117/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2117/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QCD Equation of State in External Magnetic Field and at Finite Bar
yon Density
DTSTART:20200804T080000Z
DTEND:20200804T082000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2118@conference-indico.kek.jp
DESCRIPTION:Speakers: Alexander Nikolaev (Swansea U.)\, Victor Braguta (JI
NR)\, Andrey Kotov (JINR)\, Nikita Astrakhantsev (Zurich U.)\, Natalia Kol
omoyets (JINR)\n\nIn this report we present our first results on lattice s
tudy of QCD equation of state in external magnetic field and at finite bar
yon density. The simulations are performed with $N_f = 2+1$ rooted stagger
ed quarks at physical quark masses. Finite baryon density is implemented t
hrough the lattice simulations at imaginary chemical potential. The result
s for the equation of state are expanded in imaginary chemical potential u
p to $O(\\mu_B^6)$ and analytically continued to the real domain. A signif
icant influence of the magnetic field on QCD 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:Studies on meson-baryon interactions in the HAL QCD method with al
l-to-all propagators
DTSTART:20200804T074000Z
DTEND:20200804T080000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2143@conference-indico.kek.jp
DESCRIPTION:Speakers: Kotaro Murakami (*) (Yukawa Institute for Theoretica
l Physics\, Kyoto University)\, Yutaro Akahoshi\, HAL QCD Collaboration\,
Sinya Aoki\n\nWe investigate meson-baryon interactions in the HAL QCD meth
od with all-to-all propagators using the stochastic estimations. We mainly
report the analysis of the S-wave kaon-nucleon interactions at $m_{\\pi}
\\approx 570$ MeV. Since there are no quark-antiquark creation/annihilatio
n processes in this system\, all-to-all propagators merely play a role in
increasing statistics. In addition\, we present the preliminary results fo
r the P-wave pion-nucleon interaction in the $I=3/2$ channel using the $\
\Delta$ source operator on a small volume at $m_{\\pi} \\approx 870$ MeV\,
which has a bound state corresponding to the $\\Delta$(1232) state.\n\nht
tps://conference-indico.kek.jp/event/113/contributions/2143/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2143/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Complex Langevin Simulations of Low-dimensional Supersymmetric Qua
ntum Field Theories
DTSTART:20200804T080000Z
DTEND:20200804T082000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2121@conference-indico.kek.jp
DESCRIPTION:Speakers: Arpith Kumar (*) (IISER Mohali)\, Anosh Joseph\n\nUs
ing complex Langevin dynamics\, we probe the possibility of dynamical brea
king of supersymmetry in a class of low-dimensional N=2 supersymmetric qua
ntum field theories with complex potentials. We conclude that complex Lang
evin dynamics can reliably predict the nonperturbative breaking of supersy
mmetry in cases where Monte Carlo methods are unreliable.\n\nhttps://confe
rence-indico.kek.jp/event/113/contributions/2121/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2121/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Progress in the lattice studies of Sp(4) gauge theory with antisym
metric fermions
DTSTART:20200804T082000Z
DTEND:20200804T084000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2124@conference-indico.kek.jp
DESCRIPTION:Speakers: C.-J. David Lin\, Ed Bennett\, Biagio Lucini\, David
e Vadacchino\, Maurizio Piai\, Deog Ki Hong\, Jong-Wan Lee (Pusan National
University)\n\nWe report the progress in the lattice studies of Sp(4) gau
ge theory coupled to fermions in the antisymmetric representation. Such a
theory containing three Dirac flavors has a direct relevance to the phenom
enological model building for certain types of composite Higgs and top par
tial compositeness. We formulate the lattice action with the standard plaq
uette and the Wilson-Dirac fermions. Our primary interests are in the mass
spectra and the decay constants of (flavored) spin-0 and spin-1 mesons. I
n the quenched setup we measure these quantities at several values of the
lattice spacing and valence fermion mass\, and extrapolate the results to
the continuum and the massless limits. Towards the dynamical calculations
we also present some preliminary results by focusing on the finite volume
effects and the mass dependence at finite lattice spacing.\n\nhttps://conf
erence-indico.kek.jp/event/113/contributions/2124/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2124/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Using Xilinx Alveo accelerators for Lattice QCD
DTSTART:20200804T074000Z
DTEND:20200804T080000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2119@conference-indico.kek.jp
DESCRIPTION:Speakers: Piotr Korcyl (Jagiellonian University)\, Grzegorz Ko
rcyl\, Salvatore Cali\n\nLattice QCD is one of the major scientific work-l
oads on supercomputer installations. Most of the computer time is spent in
an iterative solver of a large\, sparse set of linear equations. One of t
he simplest examples of such an iterative solver is the conjugate gradient
algorithm. In this talk\, we present an optimized implementation of this
algorithm in the context of Lattice QCD for Xilinx Alveo U280 accelerator
cards. We compare its performance with that obtained on a CPU architecture
and highlight the advantages of an FPGA-based implementation.\n\nhttps://
conference-indico.kek.jp/event/113/contributions/2119/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2119/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Parton distribution functions of $\\Delta^+$ on the lattice
DTSTART:20200807T084000Z
DTEND:20200807T090000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2128@conference-indico.kek.jp
DESCRIPTION:Speakers: Aurora Scapellato\, Fernanda Steffens\, Chuan Liu\,
Martha Constantinou\, Krzysztof Cichy\, Karl Jansen\, Constantia Alexandro
u\, Yahui Chai\, Xu Feng\, Giannis Koutsou\, Shicheng Xia\, Kyriakos Hadji
yiannakou\, Yuan Li (*) (Peking University)\n\nWe perform a first calculat
ion for the unpolarized parton distribution function of the $\\Delta^+$ ba
ryon using lattice QCD simulations within the framework of Large Momentum
Effective Theory. Two ensembles of $N_f=2+1+1$ twisted mass fermions are
utilized with a pion mass of 270 MeV and 360 MeV\, respectively. The baryo
n\, which is treated as a stable single-particle state\, is boosted with m
omentum $P_3$ with values $\\{0.42\,0.83\,1.25\\}$ GeV\, and we utilize mo
mentum smearing to improve the signal. The unpolarized parton distribution
function of $\\Delta^+$ is obtained using a non-perturbative renormalizat
ion and a one-loop formula for the matching\, with encouraging precision.
In particular\, we compute the $\\overline{d}(x)-\\overline{u}(x)$ asymmet
ry and compare it with the same quantity in the nucleon\, in a first attem
pt towards resolving the physical mechanism responsible for generating suc
h asymmetry.\n\nhttps://conference-indico.kek.jp/event/113/contributions/2
128/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2128/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Charmed meson decay constants from 2+1-flavor lattice QCD
DTSTART:20200806T070000Z
DTEND:20200806T072000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2130@conference-indico.kek.jp
DESCRIPTION:Speakers: Ying Chen\, Ming Gong\, Zhaofeng Liu\, Yunheng Ma\,
Wei-Feng Chiu\, Zhaofeng Liu (Institute of High Energy Physics\, Beijing)\
n\nOn a lattice with 2+1-flavor dynamical domain-wall fermions at the phys
ical pion mass\, we calculate the decay constants of the charmed and light
vector mesons including D/D*\, Ds/Ds*\, phi and K*. The lattice size is 4
8^3*96\, which corresponds to a spatial extension of ~5.5 fm with the latt
ice 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 then i
nterpolated/extrapolated to the physical point.\n\nhttps://conference-indi
co.kek.jp/event/113/contributions/2130/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2130/
END:VEVENT
BEGIN:VEVENT
SUMMARY:First QCD+QED simulations with C* boundary conditions
DTSTART:20200805T062000Z
DTEND:20200805T064000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2131@conference-indico.kek.jp
DESCRIPTION:Speakers: Nazario Tantalo\, Martin Hansen\, Madeleine Dale\, M
arina Krstic Marinkovic\, RC*\, Isabel Campos\, Patrick Fritzsch\, Andrea
Bussone\, Agostino Patella\, Jens Lücke (*) (Humboldt University Berlin)\
n\nFor the first time the openQ*D code was used to generate fully dynamica
l Nf=1+2+1 QCD+QED configurations with C* boundary conditions and degenera
te down and strange quarks at an unphysical value of the electromagnetic c
oupling alpha~0.04. In this talk\, technical details about the generation\
, will be presented. In particular the stability of the algorithm\, diagno
stic observables and neutral and charged meson masses will be discussed. F
urthermore the chosen tuning strategy will be shortly presented.\n\nhttps:
//conference-indico.kek.jp/event/113/contributions/2131/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2131/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Pion Vector Form Factor from Lattice QCD at the physical point
DTSTART:20200807T062000Z
DTEND:20200807T064000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2126@conference-indico.kek.jp
DESCRIPTION:Speakers: ETM Collaboration\, C. Urbach\, M. Petschlies\, U. W
enger\, B. Kostrzewa\, Youngik Lee (*) (University of Bonn)\n\nWe present
a Lattice QCD investigation of the pion electromagnetic form factor based
on gauge configurations generated by Extended Twisted Mass Collaboration w
ith N_f = 2+1+1 dynamical quark flavors. The calculation is carried out at
two different lattice spacing values directly at the physical point. Empl
oying Wilson clover twisted mass fermions at maximal twist guarantees O(a)
improved results. We present a preliminary continuum extrapolation of the
form factor and compare to the experiment. In addition\, we provide an es
timate of the pion charge radius.\n\nhttps://conference-indico.kek.jp/even
t/113/contributions/2126/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2126/
END:VEVENT
BEGIN:VEVENT
SUMMARY:First-principles calculation of electroweak box diagrams from latt
ice QCD
DTSTART:20200805T050000Z
DTEND:20200805T052000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2132@conference-indico.kek.jp
DESCRIPTION:Speakers: Xu Feng\, Mikhail Gorchtein\, Lu-Chang Jin\, Chien-Y
eah Seng\, Pengxiang Ma (*) (Peking University)\n\nWe present the first re
alistic lattice QCD calculation of the γW-box diagrams relevant for beta
decays. The nonperturbative low-momentum integral of the γW loop is calcu
lated using a lattice QCD simulation\, complemented by the perturbative QC
D result at high momenta. Using the pion semileptonic decay as an example\
, we demonstrate the feasibility of the method. By using domain wall fermi
ons 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 uncertainty cont
rolled at the level of ∼1%. This study sheds light on the first-principl
es computation of the γW-box correction to the neutron decay\, which play
s a decisive role in the determination of |Vud|.\n\nhttps://conference-ind
ico.kek.jp/event/113/contributions/2132/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2132/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nuclear force from lattice QCD with LapH smearing
DTSTART:20200807T060000Z
DTEND:20200807T062000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2173@conference-indico.kek.jp
DESCRIPTION:Speakers: Takuya Sugiura (*) (RIKEN iTHEMS)\, Tatsumi Aoyama\,
Takumi Doi\, HAL QCD Collaboration\n\nRecent studies by HAL QCD collabora
tion have been successful in calculating hadron interactions from the firs
t principles of QCD. In this talk\, we apply the Laplacian Heaviside (LapH
) smearing for the two nucleon source operator to enhance overlap with the
low-energy elastic states and calculate the s-wave nuclear force. Our pot
ential with the LapH smeared source has similar structure and comparable s
tatistical errors to that with the standard wall source operator. This wil
l be an important step towards future extension to the P-wave nuclear forc
es.\n\nhttps://conference-indico.kek.jp/event/113/contributions/2173/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2173/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice QCD on QPACE 4
DTSTART:20200804T062000Z
DTEND:20200804T064000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2139@conference-indico.kek.jp
DESCRIPTION:Speakers: Peter Georg\, Tilo Wettig\, Dirk Pleiter\, Stefan So
lbrig\, Nils Meyer (University of Regensburg)\n\nQPACE 4 is the latest mem
ber of the QCD PArallel Compute Engine (QPACE) series\, which was deployed
in Regensburg in June 2020. It features 64 Fujitsu A64FX model FX700 CPU
s interconnected by InfiniBand EDR. The A64FX is the first CPU supporting
the Arm Scalable Vector Extension (SVE). In this contribution we discuss
the implementation of SVE in the Grid Lattice QCD framework and show Grid
benchmarks on QPACE 4.\n\nhttps://conference-indico.kek.jp/event/113/cont
ributions/2139/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2139/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A physicist-friendly reformulation of the mod-two Atiyah-Patodi-Si
nger index
DTSTART:20200807T072000Z
DTEND:20200807T074000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2134@conference-indico.kek.jp
DESCRIPTION:Speakers: Mayuko Yamashita\, Mikio Furuta\, Tetsuya Onogi\, Hi
denori Fukaya\, Shinichiroh Matsuo\, Satoshi Yamaguchi\, Yoshiyuki Matsuki
(*) (Osaka University)\n\nGauge anomaly in 4-dimensions can be viewed as
a current inflow into an extra-dimension\, where the total phase of the fe
rmion partition function is given in a gauge invariant way by the Atiyah-P
atodi-Singer(APS) eta-invariant of a 5-dimensional Dirac operator. However
\, this formalism requires a non-local boundary condition\, which makes th
e physical roles of edge/bulk modes unclear and the causality of the total
theory doubtful. In this talk\, we consider a special case where the Dira
c operator is in a real representation and its eta invariant becomes the m
od-two type APS index. We propose a physicist-friendly reformulation of th
e mod-two index using domain-wall fermion formalism\, which naturally desc
ribes how the global anomaly is canceled between edge and bulk.\n\nhttps:/
/conference-indico.kek.jp/event/113/contributions/2134/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2134/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Resurgence structure on compactified spacetime with twisted bounda
ry condition
DTSTART:20200807T074000Z
DTEND:20200807T080000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2141@conference-indico.kek.jp
DESCRIPTION:Speakers: Okuto Morikawa (*) (Kyushu University)\n\nRecently\,
in the context of the resurgence program\, it was conjectured that the pe
rturbative ambiguity caused by the IR renormalon is canceled against the s
emi-classical object called bion. This conjecture requires the circle comp
actification with the $Z_N$ twisted boundary condition\, in which the bion
solution is found. Contrary to this conjecture\, we find that there is no
IR renormalon in circle-compactified theories. We then argue that the bio
n cancels the perturbative ambiguity caused by the proliferation of Feynma
n diagrams\, which are significantly affected by the compactification. The
se observations are helpful in giving a unified understanding on the resur
gence structure.\n\nhttps://conference-indico.kek.jp/event/113/contributio
ns/2141/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2141/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Complex Langevin analysis of four-dimensional SU(2) gauge theory w
ith a theta term
DTSTART:20200805T054000Z
DTEND:20200805T060000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2135@conference-indico.kek.jp
DESCRIPTION:Speakers: Yuta Ito\, Mitsuaki Hirasawa\, Atis Yosprakob\, Masa
zumi Honda\, Kohta Hatakeyama\, Jun Nishimura\, Akira Matsumoto (*) (SOKEN
DAI\, KEK)\n\nThe Monte Carlo simulation of the gauge theory with a theta
term is difficult due to the sign problem. We use the complex Langevin met
hod to overcome the problem. In our previous work on two-dimensional U(1)
gauge theory with a theta term\, we were able to reproduce the exact solut
ion by introducing a puncture 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:Supercomputer Fugaku and QCD Wide SIMD Library (QWS) on Fugaku
DTSTART:20200804T070000Z
DTEND:20200804T072000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2144@conference-indico.kek.jp
DESCRIPTION:Speakers: Yoshifumi Nakamura (RIKEN)\n\nThe supercomputer Fuga
ku is a new supercomputer in Kobe\, Japan\, co-developed by RIKEN with Fuj
itsu\, and the top system of the latest June 2020 TOP500 supercomputers. I
will introduce the supercomputer Fugaku and a Lattcie QCD simulation libr
ary\, QCD Wide SIMD library (QWS) for Fugaku. I will also present some tun
ing methods for Fugaku\, QWS performance on Fugaku\, and tentative benchma
rk results on full system of Fugaku.\n\nhttps://conference-indico.kek.jp/e
vent/113/contributions/2144/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2144/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Baryons in the Gross-Neveu model in 1+1 dimensions at finite numbe
r of flavors
DTSTART:20200807T082000Z
DTEND:20200807T084000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2151@conference-indico.kek.jp
DESCRIPTION:Speakers: Björn Wellegehausen\, Marc Wagner\, Andreas Wipf\,
Julian Lenz\, Laurin Pannullo (*) (Goethe University Frankfurt)\n\nIn a re
cent work we investigated the existence of inhomogeneous chiral phases (i.
e.\, a phase where the chiral condensate has a spatial dependence) in the
1+1-dimensional Gross-Neveu model at finite number of fermion flavors. In
the present work we continue this investigation by studying the formation
of baryons\, their spatial distribution and their relation to the inhomoge
neous chiral condensate.\n\nhttps://conference-indico.kek.jp/event/113/con
tributions/2151/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2151/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Finite-volume effects in HVP contribution to muon g-2
DTSTART:20200805T054000Z
DTEND:20200805T060000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2153@conference-indico.kek.jp
DESCRIPTION:Speakers: Agostino Patella (Humboldt-Universität zu Berlin)\,
Maxwell T. Hansen\n\nThe leading finite-volume corrections to the HVP con
tribution to the muonic (g-2) are related to the forward Compton amplitude
of the pion in a completely model-independent fashion. The developed form
alism is able to capture a few leading contributions\, up to errors of ord
er exp(-wML) where w~1.93 and M is the pion mass. By using models and chiP
T for the forward Compton tensor\, the finite-volume corrections are estim
ated for typical interesting volumes.\n\nhttps://conference-indico.kek.jp/
event/113/contributions/2153/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2153/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice QCD propagators\, Padé Approximants and Analytic structur
e
DTSTART:20200806T084000Z
DTEND:20200806T090000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2150@conference-indico.kek.jp
DESCRIPTION:Speakers: Orlando Oliveira (University of Coimbra\, Portugal)\
, Paulo J. Silva\, Alexandre Falcão\n\nAn analysis of the lattice Landau
gauge gluon and ghost propagators for pure Yang-Mills is performed using P
adé approximants to compute their analytical structure. The gluon propaga
tor is described by a pair of complex conjugate poles and a branch cut alo
ng the negative side of the Euclidean momenta. 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 discuss the implications of our finds an
d compare them to the published literature.\n\nhttps://conference-indico.k
ek.jp/event/113/contributions/2150/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2150/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Heavy to strange semileptonic decays
DTSTART:20200805T082000Z
DTEND:20200805T084000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2152@conference-indico.kek.jp
DESCRIPTION:Speakers: William Parrott (University of Glasgow)\, HPQCD\n\n"
D → Klν and B → Kl + l − are important heavy to strange semileptoni
c decay processes\, giving us direct comparison with experiment\, and acce
ss to CKM \nmatrix elements and potential new physics. We can calculate fo
rm factors for \nboth of these processes in lattice QCD and connect them t
ogether by determining heavy to strange form factors for heavy quark masse
s ranging from c to b. We can also explore the connection to form factors
with different light quark masses. Using the HISQ action on N f = 2 + 1 +
1\, we demonstrate how D → K calculations can be extended up towards the
b by a study of heavy-strange to η_s form factors\, including tests of t
he dependence on heavy quark mass\, comparing to HQET expectations. We als
o give preliminary D → K and B → K results\, for the latter including
results for 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:Gluon gravitational form factors for hadrons of different spins
DTSTART:20200805T084000Z
DTEND:20200805T090000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2154@conference-indico.kek.jp
DESCRIPTION:Speakers: Dimitra Pefkou (*) (MIT)\, Dan Hackett\, Phiala Shan
ahan\n\nWe extract structure functions corresponding to the first moment o
f the gluon GPDs from the matrix elements of the gluon energy momentum ten
sor on a clover ensemble with m_{\\pi} = 450 MeV. We present the various G
FFs for states of different spins with a focus on the D-terms. We then com
pare extracted physical quantities like the pressure and shear forces betw
een the different hadrons.\n\nhttps://conference-indico.kek.jp/event/113/c
ontributions/2154/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2154/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On the ratio between scalar and tensor glueball masses in Yang-Mil
ls theories
DTSTART:20200807T060000Z
DTEND:20200807T062000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2179@conference-indico.kek.jp
DESCRIPTION:Speakers: Jack Holligan\, Jong-Wan Lee\, Maurizio Piai\, Ed Be
nnett\, Deog Ki Hong\, C.-J. David Lin\, Biagio Lucini\, Davide Vadacchino
(*) (Trinity College Dublin)\n\nWe suggest that in Yang-Mills theories th
e ratio R of the mass of the tensor glueball over the mass of the scalar g
lueball is a universal quantity that depends only on the dimensionality of
the space. To support this conjecture\, we compute numerically R for Sp(2
N) gauge theories for N = 1\, 2\, 3\, 4 in d=4 Euclidean dimensions on a l
attice and we analyse our results together with previous lattice studies o
f other Yang-Mills theories\, in both d=4 and d=3. We then compare our fin
dings to various analytic models in which R can be computed explicitly in
the large N limit.. Finally\, we show that a constant R might emerge in a
context in which scale invariance is broken\, giving rise to a light dila
ton state that can be interpreted as the lowest-lying scalar glueball. Our
results provide further insights towards 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:Investigation of Doubly Heavy Tetraquark Systems using Lattice QCD
DTSTART:20200807T052000Z
DTEND:20200807T054000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2157@conference-indico.kek.jp
DESCRIPTION:Speakers: Martin Pflaumer (*) (Goethe University Frankfurt)\,
Marc Wagner\, Stefan Meinel\, Luka Leskovec\n\nWe search for possibly exis
tent bound states in the heavy-light tetraquark channels with quark conten
t $ \\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 e
nsembles with $ N_f=2+1 $ flavours of domain-wall fermions and consider a
basis of local and non-local interpolators. Besides extracting the energy
spectrum from the correlation matrix\, we perform additionally a Lüscher
analysis to extrapolate our results to infinite volume.\n\nhttps://confere
nce-indico.kek.jp/event/113/contributions/2157/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2157/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chiral symmetry and the Roper resonance
DTSTART:20200804T070000Z
DTEND:20200804T072000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2180@conference-indico.kek.jp
DESCRIPTION:Speakers: Adam Virgili (*) (University of Adelaide)\, Waseem K
amleh\, Derek Leinweber\n\nThe origin of the low-lying nature of the Roper
resonance has been the subject of significant interest for many years\, i
ncluding several investigations using lattice QCD. It has been claimed tha
t chiral symmetry plays an important role in our understanding of this res
onance. We present results from our systematic examination of the potentia
l role of chiral symmetry in the low-lying nucleon spectrum through the di
rect comparison of the clover and overlap fermion actions. After a brief s
ummary of the background motivation\, we specify the computational details
of the study and outline our comparison methodologies. We do not find any
strong evidence supporting the claim that chiral symmetry plays a signifi
cant role in understanding the Roper resonance on the lattice.\n\nhttps://
conference-indico.kek.jp/event/113/contributions/2180/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2180/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Energy-like observables for the chiral phase transition of 2+1 fla
vor QCD
DTSTART:20200804T062000Z
DTEND:20200804T064000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2165@conference-indico.kek.jp
DESCRIPTION:Speakers: Anirban Lahiri\, David Clarke\, Frithjof Karsch\, Ol
af Kaczmarek\, Christian Schmidt\, Mugdha Sarkar (*) (Bielefeld University
)\n\nThe chiral symmetry restoration of QCD\, with two light flavours in t
he chiral limit\, is expected to be a phase transition belonging to the un
iversality class of 3d O(N) models. The imprint of the criticality should
be observed in the thermodynamic observables if we move close enough to th
e chiral limit. We discuss results of conserved charge fluctuations and Po
lyakov loop\, which we propose to behave as energy-like observables with r
espect to the chiral phase transition\, towards the chiral limit. Calculat
ions have been performed on 2+1 flavour HISQ ensembles with pion masses st
arting from 160 MeV down to 55 MeV.\n\nhttps://conference-indico.kek.jp/ev
ent/113/contributions/2165/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2165/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Relativistic N particle energy shifts in finite volume
DTSTART:20200806T080000Z
DTEND:20200806T082000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2167@conference-indico.kek.jp
DESCRIPTION:Speakers: Fernando Romero-Lopez\, Carsten Urbach\, Nikolas Sch
lage\, Akaki Rusetsky\, Nikolas Schlage (*) (University Bonn)\n\nUsing a n
on-relativistic EFT\, we derive a general relativistic expression for the
energy shift in finite volume. This includes the N-particle ground state\,
and the first two- and three-particle excited states. In addition\, we pr
obe the N particle energy shift formula in complex phi^4 theory. We invest
igate different fit models\, that include relativistic effects\, exponenti
ally suppressed corrections and perturbation-theory inspired ansätze. We
discuss the challenges to reliably obtain the three-body scattering amplit
ude.\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:A new perspective to hadronic excitations above Tc
DTSTART:20200804T070000Z
DTEND:20200804T072000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2162@conference-indico.kek.jp
DESCRIPTION:Speakers: K. Suzuki\, Y. Aoki\, H. Fukaya\, G. Cossu\, S. Hash
imoto\, Christian Rohrhofer (*) (Osaka University)\n\nHadronic matter is k
nown to change its behaviour during a crossover at finite temperature. One
part of this crossover is the chiral transition\, whose properties are we
ll studied. The other part involves the fate of hadronic bound states and
single quarks\, the transition of which is less clear. We study two-flavor
QCD for temperatures starting from 190 MeV and quark masses down to light
er-than-physical quarks using chirally symmetric domain-wall fermions. Ado
pting a novel approach to fit lattice data we get new results for screenin
g masses\, which allow for a more detailed comparison to perturbative calc
ulations. The lattice data favors a cut instead of a single pole for the p
ropagation of hadronic excitations above Tc. Key features of previous stud
ies\, including chiral spin and SU(4) symmetry\, are reproduced.\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:Exploring the ’t Hooft limit of meson observables
DTSTART:20200805T062000Z
DTEND:20200805T064000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2163@conference-indico.kek.jp
DESCRIPTION:Speakers: Fernando Romero-Lopez (*) (University of Valencia)\,
Andrea Donini\, Pilar Hernandez\, Carlos Pena\n\nThe 't Hooft limit of QC
D\, also referred to as large Nc limit\, constitutes a simplification of t
he theory that preserves most of its non-perturbative properties\, includi
ng confinement and spontaneous chiral symmetry breaking. It also leads to
some definite predictions such as a non-existing Delta I=1/2 rule in the K
-> pi pi isospin decay amplitudes. Many phenomenological approaches to had
ron physics employ approximations inspired by this limit\, even for quanti
ties such as the former\, where the large Nc prediction is off. In this ta
lk\, I will present our recent lattice results for some relevant observabl
es for light meson physics\, such as meson mases and decay constants\, non
leptonic kaon decay amplitudes\, and scattering amplitudes.\n\nhttps://con
ference-indico.kek.jp/event/113/contributions/2163/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2163/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gamma model - bosonization and gauge theory interpretation
DTSTART:20200807T082000Z
DTEND:20200807T084000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2164@conference-indico.kek.jp
DESCRIPTION:Speakers: Blazej Ruba (*) (Jagiellonian University in Cracow)\
, Adam Wyrzykowski\, Jacek Wosiek\, Arkadiusz Bochniak\n\nThis talk is abo
ut a bosonization procedure based on Clifford algebra-valued degrees of fr
eedom\, valid for spaces of any dimension. Its interpretation in terms of
lattice Z_2 gauge theory will be presented. Brief comparison with other bo
sonization proposals will be given.\n\nhttps://conference-indico.kek.jp/ev
ent/113/contributions/2164/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2164/
END:VEVENT
BEGIN:VEVENT
SUMMARY:From QCD string breaking to quarkonium spectrum
DTSTART:20200806T072000Z
DTEND:20200806T074000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2080@conference-indico.kek.jp
DESCRIPTION:Speakers: Marco Catillo (*) (Ludwig Maximilian University of M
unich)\, Pedro Bicudo\, Marina Marinkovic\, Nuno Cardoso\n\nSignal-to-nois
e problem and excited states contamination\, inter alia\, make studies of
the QCD string breaking phenomenon a challenging task in lattice QCD. The
static quark potentials produced for these studies can be combined with th
e Born Oppenheimer approximation to give an important insight into I=0 qua
rkonium resonances. Precise determination of various lattice potentials ar
e also needed for better understanding of the bound states and hybrid meso
ns recently observed at LHC and other experiments. In this talk\, we prese
nt preliminary results on the Wilson loop correlators and compare smeared
and unsmeared static potentials for two flavour QCD with improved Wilson f
ermions. The systematic errors are reduced by solving the generalised eige
nvalue problem.\n\nhttps://conference-indico.kek.jp/event/113/contribution
s/2080/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2080/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Complex Langevin analysis of 2D U(1) gauge theory on a torus with
a θ term
DTSTART:20200805T052000Z
DTEND:20200805T054000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2193@conference-indico.kek.jp
DESCRIPTION:Speakers: Atis Yosprakob (*) (SOKENDAI)\, A. Matsumoto\, J. Ni
shimura\, M. Hirasawa\n\nMonte Carlo simulation of gauge theories with a t
heta term is known to be extremely difficult due to the sign problem. We c
onsider the complex Langevin method (CLM)\, which is one of the approaches
to overcome this problem. As a first step\, we apply the method to 2D U(1
) gauge theory with a theta term\, which can be solved analytically. We fi
nd that naive implementation of the method fails because of the topologica
l nature of the theta term. In order to circumvent this problem\, we intro
duce a puncture on the torus. We find that the CLM works and reproduces th
e exact results for the punctured model even at large theta. We also prove
that the punctured model is equivalent to the infinite volume limit of th
e original model inside the fundamental domain of theta.\n\nhttps://confer
ence-indico.kek.jp/event/113/contributions/2193/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2193/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Partial deconfinement for some bosonic matrix models
DTSTART:20200805T062000Z
DTEND:20200805T064000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2184@conference-indico.kek.jp
DESCRIPTION:Speakers: E. Rinaldi\, N. Bodendorfer\, M. Hanada\, G. Bergner
\, S. Shiba Funai\, M. Knaggs\, A. Schafer\, P. Vranas\, Hiromasa Watanabe
(*) (University of Tsukuba)\n\nWe provide evidence for partial deconfinem
ent by using lattice Monte Carlo simulations of some bosonic matrix models
.\nPartial deconfinement is the phenomenon that coexists the confined and
deconfined phases in the system\, in particular of several large-N gauge t
heories\, at finite temperature.\nBy appropriately fixing the gauge\, we o
bserve that only submatrices deconfine in the analysis of the gauged-Gauss
ian matrix model and the Yang-Mills matrix model. \nWe also discuss the ap
plications to QCD.\n\nhttps://conference-indico.kek.jp/event/113/contribut
ions/2184/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2184/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Equivalence of three-particle quantization conditions
DTSTART:20200804T054000Z
DTEND:20200804T060000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2168@conference-indico.kek.jp
DESCRIPTION:Speakers: Stephen Sharpe (University of Washington)\, Tyler D
. Blanton\n\nWe show that a recently derived alternative form of the relat
ivistic three-particle quantization condition for identical particles can
be rewritten in terms of the R matrix introduced to give a unitary represe
ntation of the infinite-volume three-particle scattering amplitude. Combin
ed with earlier work\, this shows the equivalence of the relativistic effe
ctive field theory approach of Refs. [1\, 2] and the “finite-volume unit
arity” approach of Refs. [3\, 32]. It also provides a generalization of
the latter approach to arbitrary angular momentum of two-particle subsyste
ms.\n\nhttps://conference-indico.kek.jp/event/113/contributions/2168/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2168/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice calculation of GPDs and twist-3 PDFs of the proton
DTSTART:20200805T074000Z
DTEND:20200805T080000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2166@conference-indico.kek.jp
DESCRIPTION:Speakers: Karl Jansen\, Krzysztof Cichy\, Martha Constantinou\
, Kyriakos Hadjiyiannakou\, Andreas Metz\, Shohini Bhattacharya\, Fernanda
Steffens\, Constantia Alexandrou\, Aurora Scapellato (*) (Adam Mickiewicz
University)\n\nIn this talk we present the first lattice QCD calculation
of unpolarized and helicity generalized parton distributions (GPDs) for th
e proton. We use the quasi-distribution approach\, which relies on compu
tations of correlation functions that\, for sufficiently fast moving
hadrons\, can be matched to light-cone distributions using perturb
ation theory. The calculations are performed on an ensemble of $N_f= 2 +
1 + 1$ maximally twisted mass fermions with a clover improvement\, at pio
n mass $m_\\pi=270$ MeV and lattice spacing $a=0.093$ fm. The proton is bo
osted up to 1.67 GeV to check momentum convergence. We are able to extrac
t the $x$-dependence of GPDs\, that is mostly unknown so far\, with contro
lled statistical uncertainties. We also present other directions we explor
e\, such as the extraction of the twist-3 parton distribution function $g_
T(x)$ and the test of the Wandura-Wilczek approximation.\n\nhttps://confer
ence-indico.kek.jp/event/113/contributions/2166/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2166/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Heavy quark diffusion coefficient from lattice QCD
DTSTART:20200806T050000Z
DTEND:20200806T052000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2171@conference-indico.kek.jp
DESCRIPTION:Speakers: Olaf Kaczmarek\, Lukas Mazur\, Luis Altenkort\, Guy
D. Moore\, Alexander M. Eller\, Hai-Tao Shu (*) (Bielefeld University)\n
\nWe show the heavy quark diffusion coefficient calculated on the lattice.
The coefficient is obtained from the color-electric correlators via Kubo
formula. The correlators are measured at 1.5$T_c$ on different large isotr
opic lattices in the quenched approximation under gradient flow. After con
tinuum extrapolation we also extrapolate the continuum correlators back to
zero flow time. The extrapolated correlators are then fitted using theore
tically motivated model spectral functions. By taking the slope of the spe
ctral function at vanishing frequency we obtain the heavy quark diffusion
coefficient. In this talk we will also compare our results with those from
other lattice studies.\n\nhttps://conference-indico.kek.jp/event/113/cont
ributions/2171/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2171/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Field Selection Algorithm for Correlation Functions
DTSTART:20200804T080000Z
DTEND:20200804T082000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2170@conference-indico.kek.jp
DESCRIPTION:Speakers: Xia Shicheng (*) (Peking University)\, Yuan Li\, Xu
Feng\n\nThe most computational cost in typical lattice QCD simulation is d
oing the invertion to obtain the propagator. While it is a huge waste to f
ree the propagators in RAM after the contraction. This work explores a fie
ld selection algorithm for the correlation functions. The field selection
algorithm constructs the correlation function by selecting point on the la
ttice. It is found that almost the same precision can be obtained at three
point function and two point function with about 1/100 point of full lat
tice. The field selection algorithm has a huge advantage to save the propa
gators on disk and also 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:Quark composition and color structure of heavy-heavy mesons and te
traquarks
DTSTART:20200804T080000Z
DTEND:20200804T082000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2181@conference-indico.kek.jp
DESCRIPTION:Speakers: Sebastian Velten\, Nuno Cardoso\, Pedro Bicudo\, Ant
je Peters\, Marc Wagner (Goethe University Frankfurt)\n\nWe explore the qu
ark 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 the relat
ive importance of meson-meson and diquark-antidiquark creation operators f
or the lattice QCD static potential relevant for b-bar b-bar u d tetraquar
ks with I = 0.\n\nhttps://conference-indico.kek.jp/event/113/contributions
/2181/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2181/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nucleon structure at physical point in 2 + 1 flavor lattice QCD
DTSTART:20200805T070000Z
DTEND:20200805T072000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2177@conference-indico.kek.jp
DESCRIPTION:Speakers: Ken-Ichi Ishikawa\, Yasumichi Aoki\, PACS Collaborat
ion\, Shoichi Sasaki\, Eigo Shintani\, Takeshi Yamazaki\, Yoshinobu Kurama
shi\, Ryutaro Tsuji (*) (Tohoku University)\n\nWe will present the current
status of nucleon structure studies with physical light quarks (m_pi = 13
5 MeV) in a large spatial extent of about 10 fm. Our calculations are carr
ied out with the PACS10 gauge configurations generated by the PACS Collabo
ration with the stout-smeared O(a) improved Wilson fermions and Iwasaki ga
uge 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 helicity fraction
s\, which are regarded as bench marks on lattice calculations of parton di
stribution functions. In addition\, we will also present the preliminary r
esult of the axial charge with another PACS10 ensemble generated at the fi
ner lattice spacing\, so as to estimate the systematic uncertainties due t
o the lattice discretization error.\n\nhttps://conference-indico.kek.jp/ev
ent/113/contributions/2177/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2177/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Violation of non-Abelian Bianchi identity and color confinement in
QCD
DTSTART:20200806T074000Z
DTEND:20200806T080000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2174@conference-indico.kek.jp
DESCRIPTION:Speakers: Tsuneo Suzuki (Research Center for Nuclear Physics\,
Osaka University)\, Katsuya Ishiguro\, Atsuki Hiraguchi\n\nA new scheme f
or color confinement in QCD due to violation of non-Abelian Bianchi identi
ty (VNABI) is proposed and numerical results in pure SU2 and SU3 QCD supp
orting 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:Long-distance contribution to neutrinoless double beta decays in p
ion sector
DTSTART:20200805T052000Z
DTEND:20200805T054000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2178@conference-indico.kek.jp
DESCRIPTION:Speakers: Xin-yu Tuo (*) (Peking university)\, Lu-chang Jin\,
Xu Feng\n\nNeutrinoless double beta decay\, if detected\, would prove that
neutrinos are Majorana fermions and provide the direct evidence for lepto
n 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 t
wo simplest processes accessible via first-principle lattice QCD calculati
ons. In this work\, we calculate the long-distance contributions to the π
\n− → π+ee transition amplitude using four ensembles at the physical
pion mass with various volumes and lattice spacings. We adopt the infinite
-volume reconstruction method 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)s
tat determined from the crossed 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:Thermal field theory with pure states
DTSTART:20200806T082000Z
DTEND:20200806T084000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2175@conference-indico.kek.jp
DESCRIPTION:Speakers: Gumaro Rendón\, Taku Izubuchi\, Yuki Nagai\, Yuta K
ikuchi\, Akio Tomiya (*) (Riken/BNL)\n\nRecently\, many studies of quantum
field theory with quantum computers have reported. Quantum calculation ca
n only treat unitary evolution\, so thermal physics is one of difficulty o
f it because one needs to produce mixed states within allowed operations.
Towards resolving the problem\, we attempt to investigate thermal physics
with thermal pure quantum(TPQ) state formalism. TPQ state formalism enable
s us to calculate the thermal average without mixed states. In the talk\,
we report progress on the application of TPQ state formalism to quantum fi
eld theory.\n\nhttps://conference-indico.kek.jp/event/113/contributions/21
75/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2175/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The applications of quantum computing techniques to lattice gauge
theory and quantum noise mitigation
DTSTART:20200805T084000Z
DTEND:20200805T090000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2183@conference-indico.kek.jp
DESCRIPTION:Speakers: Karl Jansen\, Tobias Hartung\, Lena Funcke\, Paolo S
tornati\, Stefan Ku ̈hn\, Xiaoyang Wang (*) (Peking University)\n\nDue to
the existence of sign problem in the Lattice QCD simulation with finite c
hemical potential\, the traditional Monte-Carlo simulations on classical s
upercomputers are confronted with significant difficulties on achieving hi
gh precision. On the other hand\, with the fast development of quantum com
puters\, it might be possible to provide the ultimate solution to sign pro
blem in the future. However\, constrained by the nature of NISQ quantum ha
rdware in the current days\, quantum noise is one of the main barriers whi
ch prevent the realistic applications of quantum computers. Here I will in
troduce an optimization algorithm\, which is run on current quantum device
s and has been applied to a 1+1 dimension lattice gauge theory. I will als
o talk about a method to mitigate the quantum noise in an efficient way\,
which has been tested on IBM-Q quantum hardwares.\n\nhttps://conference-in
dico.kek.jp/event/113/contributions/2183/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2183/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Multiple right-hand-side implementation for DD$\\alpha$AMG
DTSTART:20200804T054000Z
DTEND:20200804T060000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2191@conference-indico.kek.jp
DESCRIPTION:Speakers: Shuhei Yamamoto (*) (The Cyprus Institute)\, Simone
Bacchio\, Jacob Finkenrath\n\nWe present a multiple right-hand side (rhs)
implementation of the Adaptive Aggregation-based Domain Decomposition Mult
igrid method (DD$\\alpha$AMG) using twisted mass fermions.\nOur implementa
tion extends the strong scaling region of DD$\\alpha$AMG and simplifies ve
ctorization\, which would otherwise require using vector extensions. This
multiple rhs implementation is thus better suited to take advantage of cur
rent and emerging HPC trends\, which involve increasing core counts per no
de and more diverse CPU architectures\, such as ARM\, Intel Xeon\, and AMD
Epyc.\nIn this talk\, we will describe our implementation strategy and sh
ow preliminary scaling results. Moreover\, we will show preliminary result
s obtained using Block Krylov solvers as complementary preconditioners wit
hin DD$\\alpha$AMG\, as provided by the Fast Accurate Block Linear krylOv
Solver (Fabulous) library.\n\nhttps://conference-indico.kek.jp/event/113/c
ontributions/2191/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2191/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QED+QCD Corrections to the Anomalous Magnetic Moment of the Muon
DTSTART:20200805T050000Z
DTEND:20200805T052000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2185@conference-indico.kek.jp
DESCRIPTION:Speakers: Alex Westin (*) (University of Adelaide)\n\nThere ex
ists a long standing discrepancy of around 3.5 sigma between experimental
measurements and standard model calculations of the magnetic moment of the
muon. Current experiments aim to reduce the experimental uncertainty by a
factor of 4\, and Standard Model calculations must also be improved by a
similar order. The largest uncertainty in the Standard Model calculation c
omes from the QCD contribution\, in particular the leading order hadronic
vacuum polarisation (HVP). To calculate the HVP contribution\, we use latt
ice gauge theories which allows us to study QCD at low energies. In order
to better understand this quantity\, we investigate the effect of QED corr
ections to the leading order HVP term by including QED in our lattice calc
ulations\, and investigate flavour breaking effects. This is done using fu
lly dynamical QCD+QED gauge configurations generated by the QCDSF collabor
ation and a novel method of quark turning.\n\nhttps://conference-indico.ke
k.jp/event/113/contributions/2185/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2185/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Neutral $B$ and $B_s$ mixing matrix elements using NRQCD and the M
ILC HISQ ensembles
DTSTART:20200805T054000Z
DTEND:20200805T060000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2186@conference-indico.kek.jp
DESCRIPTION:Speakers: C. T. H. Davies\, R. J. Dowdall\, M. Wingate\, J. G.
I. H. Harrison\, R. R. Horgan\, J. Shigemitsu\, C. J. Monahan\, G. P. Lep
age\, HPQCD Collaboration\, Matthew Wingate (University of Cambridge)\n\nI
n this talk I will briefly review our recent lattice calculations for matr
ix elements contributing to the mass and width differences of neutral $B$
mesons [arXiv:1907.01025\, arXiv:1910.00970]. The calculations were done u
sing the MILC ensembles generated with 4-flavours of sea quarks utilizing
the highly improved staggered quark action. An improved nonrelativistic qu
ark action was used for the bottom quark. Consequences of these calculati
ons include 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 $\\Delta \\Ga
mma_s$.\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:Constraints of kinematic bosonization in two and higher dimensions
DTSTART:20200807T080000Z
DTEND:20200807T082000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2190@conference-indico.kek.jp
DESCRIPTION:Speakers: Jacek Wosiek (Jagiellonian University)\, Adam Wyrzyk
owski\, Arkadiusz Bochniak\, Blazej Ruba\n\nContrary to the common wisdom\
, local bosonizations of fermionic systems exist in higher dimensions. Int
erestingly\, resulting bosonic variables must satisfy local constraints of
a gauge type. They effectively replace long distance exchange interaction
s. In this work we study in detail the properties of such a system which w
as 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 lattices with arbitr
ary sizes. For few small systems the constraints are solved analytically a
nd the complete spectra of reduced spin hamiltonias are shown to agree wit
h the original fermionic ones. The equivalence is also extended to fermion
s in an external Wegner Z2 field. It is also illustrated by an explicit ca
lculation for a particular configuration of Wegner variables.\n\nhttps://c
onference-indico.kek.jp/event/113/contributions/2190/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2190/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Inhomogeneous phases in the 2+1-dimensional Gross-Neveu model in t
he limit of infinite fermion flavors
DTSTART:20200805T060000Z
DTEND:20200805T062000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2187@conference-indico.kek.jp
DESCRIPTION:Speakers: Marc Winstel (*) (Goethe University\, Frankfurt am M
ain)\, Lennart Kurth\, Michael Buballa\n\nWe explore the phase diagram of
the 2+1-dimensional Gross-Neveu model in the limit of infinite flavors\, w
hich shares certain properties with QCD\, and the existence of an inhomoge
neous phase using lattice field theory. Numerical results are presented\,
which include the phase boundaries in the $\\mu$-$T$ plane as well as the
structure of the chiral condensate in the inhomogeneous phase.\n\nhttps://
conference-indico.kek.jp/event/113/contributions/2187/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2187/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Glueball dark matter in SU(N) lattice gauge theory
DTSTART:20200807T062000Z
DTEND:20200807T064000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2192@conference-indico.kek.jp
DESCRIPTION:Speakers: Nodoka Yamanaka (University of Massachusetts Amherst
)\, Atsushi Nakamura\, Masayuki Wakayama\n\nThe glueballs in the SU(N) Yan
g-Mills theory are theoretically the most natural among composite dark mat
ter scenarios.\nIn this work\, we evaluate the interglueball potential in
SU(N) lattice gauge theories using the HALQCD method and derive the glueba
ll dark matter scattering cross section\, and then constrain the scale par
ameter of the gauge theory from the observational data.\n\nhttps://confere
nce-indico.kek.jp/event/113/contributions/2192/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2192/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Domain Wall and Overlap Fermions in 2+1D
DTSTART:20200804T070000Z
DTEND:20200804T072000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2189@conference-indico.kek.jp
DESCRIPTION:Speakers: Jude Worthy (*) (Swansea University)\, Simon Hands\n
\nLayered systems such as graphene have become an important area of invest
igation. Within the broader programme of investigating critical phenomena
in such systems\, we look at different mass configurations for domain wall
fermions and overlap fermions in 2+1D. The equivalence between formulatio
ns is reviewed\, and formulations for the condensate and susceptibility ar
e given. Locality of fermion operators is required for the recovery of U(2
) symmetry and is demonstrated with numerical experiments. Further aspects
are also considered.\n\nhttps://conference-indico.kek.jp/event/113/contri
butions/2189/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2189/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards color superconductivity on the lattice --- perturbative pr
edictions and the complex Langevin method
DTSTART:20200807T080000Z
DTEND:20200807T082000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2197@conference-indico.kek.jp
DESCRIPTION:Speakers: Asato Tsuchiya\, Jun Nishimura\, Yuta Ito\, Shoichir
o Tsutsui\, Yusuke Namekawa\, Yuhma Asano\, Hideo Matsufuru\, Takeru YOKOT
A (*) (The University of Tokyo)\n\nThe phase structure of QCD at finite de
nsity is expected to be revealed by the complex Langevin method (CLM)\, wh
ich is a promising approach to overcome the sign problem. In particular\,
we discuss the possibility of investigating the color superconductivity (C
SC) on the lattice by the CLM. Towards that end\, we predict the parameter
region in which CSC occurs in lattice perturbation theory based on the ga
p equation. Our perturbative calculations are justified by considering a s
mall spatial volume due to the asymptotic freedom. Most notably\, we can p
redict the explicit form of the Cooper pairs 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:Finite temperature study of a 4+6 flavor mass-split system
DTSTART:20200804T052000Z
DTEND:20200804T054000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2156@conference-indico.kek.jp
DESCRIPTION:Speakers: Curtis Peterson (*) (University of Colorado at Bould
er)\, Oliver Witzel\, Anna Hasenfratz\n\nNear-conformal systems are favore
d candidates to describe composite Higgs or composite dark matter particle
s. Their finite temperature phase structure may provide new insights into
the dynamics. It is particularly important to determine the order of the p
hase transition. Many-flavor near-conformal systems might exhibit a first-
order phase transition with a possibly large latent heat. This could have
important phenomenological implications\, 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 continue to explore the mass-split system
for different ratios of light flavor 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:Chiral phase transition temperature in (2+1)-flavor QCD
DTSTART:20200804T052000Z
DTEND:20200804T054000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2122@conference-indico.kek.jp
DESCRIPTION:Speakers: Swagato Mukherjee\, O. Kaczmarek\, P. Hegde\, S.-T.
Li\, C. Schmidt\, H. Ohno\, H.-T. Ding\, F. Karsch\, P. Steinbrecher\, P.
Petreczky\, Anirban Lahiri (Bielefeld University)\n\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 physical
mass. We propose and calculate two novel estimators for the chiral transi
tion temperature for several values of the light quark masses\, correspond
ing to Goldstone pion masses in the range between (approximately) 58 MeV a
nd (approximately) 163 MeV. The chiral phase transition temperature is det
ermined by extrapolating to vanishing pion mass using universal scaling an
alysis. After thermodynamic\, continuum and chiral extrapolations we find
the chiral phase transition temperature $T_c^0=132^{+3}_{-6}$~MeV.\n\nhttp
s://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:Noise-robust Implementation of Gauss's law for quantum computers
DTSTART:20200806T062000Z
DTEND:20200806T064000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2138@conference-indico.kek.jp
DESCRIPTION:Speakers: Yannick Meurice (University of iowa)\, QuLAT\n\nWe d
iscuss continuous symmetries identities using the tensor formulation of la
ttice spin and gauge models. We show that the symmetries are encoded in th
e selection rules of the tensor. This allows truncations that preserve the
symmetries exactly. We present the tensorial expression of the transfer m
atrix for Abelian gauge theories and explain how gauge fixing and Gauss's
law relate. \nWe propose redefinitions of the electric quantum numbers su
ch that Gauss's law is always satisfied even when the time evolution is im
plemented on NISQ devices. We discuss ways to minimize the number of degre
es of freedom. \nWe briefly discuss practical implementations for a Z2 gau
ge theory. \nThis follows arXiv:2003.10986 (Phys. Rev. D in press) and Phy
s. Rev. D 100\, 014506\n\nhttps://conference-indico.kek.jp/event/113/contr
ibutions/2138/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2138/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Application of the tempered Lefschetz thimble method to a chiral r
andom matrix model
DTSTART:20200805T072000Z
DTEND:20200805T074000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2136@conference-indico.kek.jp
DESCRIPTION:Speakers: Nobuyuki Matsumoto (*) (Kyoto University)\, Masafumi
Fukuma\, Naoya Umeda\n\nMonte Carlo simulations of finite density QCD is
plagued by the sign problem. The tempered Lefschetz thimble method (TLTM)
[Fukuma-Umeda(1703.00861)] is a promising algorithm towards solving the si
gn problem\, where the integration region is deformed into the complex spa
ce and the system is parallel-tempered with the flow time so as to solve b
oth sign and ergodicity problems simultaneously. In this talk\, we apply t
he 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 res
ults for small N and discuss the scaling of the computational cost as N in
creases [Fukuma-NM-Umeda(in preparation)]. We also explain how to implemen
t HMC algorithm to the TLTM [Fukuma-NM-Umeda(1912.13303)].\n\nhttps://conf
erence-indico.kek.jp/event/113/contributions/2136/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2136/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thermal transition in QCD with Nf=2+1 flavours of Wilson quark
DTSTART:20200804T050000Z
DTEND:20200804T052000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2057@conference-indico.kek.jp
DESCRIPTION:Speakers: Jon-Ivar Skullerud\, Chris Allton\, Aleksandr Nikola
ev\, Maria-Paola Lombardo\, Benjamin Jaeger\, Jonas Glesaaen\, Seyong Kim\
, Simon Hands\, Sinead Ryan\, Liang-Kai Wu\, Gert Aarts (Swansea Universit
y)\n\nThe thermal transition in QCD has been studied in detail using the s
taggered-quark formulation. Here we report on progress using Nf=2+1 flavou
rs of Wilson fermions\, employing anisotropic\, fixed-scale lattice simula
tions. Observables are compared for two values of the pion mass\, focusing
on chiral properties: the chiral condensate and its susceptibility\, quar
k number susceptibilities\, and the onset of parity doubling in the light
and strange baryonic sector. For the pseudo-critical temperature obtained
from the chiral condensate\, we combine our results with those from twiste
d-mass fermions and extrapolate to the physical point - without a continuu
m extrapolation -\, yielding T_pc=159(6) MeV.\n\nhttps://conference-indico
.kek.jp/event/113/contributions/2057/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2057/
END:VEVENT
BEGIN:VEVENT
SUMMARY:What is chiral susceptibility probing?
DTSTART:20200804T082000Z
DTEND:20200804T084000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2090@conference-indico.kek.jp
DESCRIPTION:Speakers: JLQCD collaboration\, S. Hashimoto\, S. Aoki\, Y. Ao
ki\, T. Kaneko\, K. Suzuki\, C. Rohrhofer\, Hidenori Fukaya (Osaka Univers
ity)\n\nThe chiral susceptibility\, or the first derivative of the chiral
condensate\, is used as a probe for QCD phase transition. It is well-known
that the chiral condensate is an order parameter of SU(2)_L x SU(2)_R sym
metry breaking. However\, the condensate also breaks the axial U(1) symmet
ry\, which is usually not paid attention as it is already broken by anomal
y. In this talk\, we would like to show a surprising numerical result by
JLQCD collaboration that the chiral susceptibility is dominated by the axi
al 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:Alternative derivation of relativistic three-particle quantization
condition
DTSTART:20200804T052000Z
DTEND:20200804T054000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2070@conference-indico.kek.jp
DESCRIPTION:Speakers: Tyler Blanton (*) (University of Washington)\, Steph
en R. Sharpe\n\nWe present a simplified derivation of the relativistic thr
ee-particle quantization condition for identical\, spinless particles. The
simplification is afforded by using time-ordered perturbation theory (TOP
T) and a three-particle quasilocal K matrix that is not fully symmetrized
to organize the relevant diagrams in an intuitive manner\, ultimately lead
ing to a new form of the quantization condition. This form can then be rel
ated algebraically to both the standard quantization condition\, which use
s a fully symmetric three-particle K matrix\, and the quantization conditi
on based on extending unitary representations of the three-particle amplit
ude to finite volume. It should also allow a more straightforward generali
zation of the quantization condition to nondegenerate particles\, and perh
aps also to more than three particles.\n\nhttps://conference-indico.kek.jp
/event/113/contributions/2070/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2070/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Complex Langevin analysis of the spontaneous breaking of 10D rotat
ional symmetry in the Euclidean IKKT matrix model
DTSTART:20200805T050000Z
DTEND:20200805T052000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2063@conference-indico.kek.jp
DESCRIPTION:Speakers: Toshiyuki Okubo\, Jun Nishimura\, Konstantinos N. An
agnostopoulos\, Stratos Kovalkov Papadoudis\, Yuta Ito\, Takehiro Azuma (S
etsunan University)\n\nThe IKKT matrix model is a promising candidate for
a nonperturbative formulation of superstring theory\, in which spacetime i
s conjectured to emerge dynamically from the microscopic matrix degrees of
freedom in the large-N limit. Indeed in the Lorentzian version\, Monte Ca
rlo studies suggested the emergence of (3+1)-dimensional expanding space-t
ime. Here we study the Euclidean version instead\, and investigate an alte
rnative scenario for dynamical compactification of extra dimensions via th
e spontaneous symmetry breaking (SSB) of 10D rotational symmetry. We perfo
rm numerical simulations based on the complex Langevin method (CLM) in ord
er to avoid a severe sign problem. Furthermore\, in order to avoid the sin
gular-drift problem in the CLM\, we deform the model and determine the SSB
pattern as we vary the deformation parameter. From these results\, we con
clude that the original model has an SO(3) symmetric vacuum\, which is con
sistent with previous results obtained by the Gaussian expansion method (G
EM). We also apply the GEM to the deformed matrix model and find consisten
cy with the results obtained by the CLM.\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:Renormalisation of quark and gluon operators using Feynman-Hellman
n
DTSTART:20200806T054000Z
DTEND:20200806T060000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2105@conference-indico.kek.jp
DESCRIPTION:Speakers: R. D. Young\, P. E. L. Rakow\, R. Horsley\, W. Kaml
eh\, H. Stüben\, Y. Nakamura\, CSSM-QCDSF-UKQCD Collaborations\, J. M. Za
notti\, G. Schierholz\, H. Perlt\, Tomas Howson (*) (University of Adelaid
e)\n\nThe decomposition of energy and momentum in the hadron in terms of q
uark and gluon constituents is of fundamental importance to hadron structu
re\, and with the ongoing development of the future Electron-Ion Collider\
, there is tremendous interest in imaging the transverse distributions of
these constituents. This program will be strengthened by complimentary stu
dies in Lattice QCD\, where a renormalisation of the lattice operators is
necessary to connect the calculated distributions to the corresponding phe
nomenological quantities reported in a familiar renormalisation scheme\, s
uch as MS-bar. In such a renormalisation scheme\, the quark and gluon oper
ators mix under renormalisation. In literature it has been common to obtai
n the off-diagonal renormalisation factors through perturbation theory. Ho
wever\, for consistency\, a fully non-perturbative renormalisation scheme
that computes all components of the renormalisation matrix is desired. We
will demonstrate an RI-MOM renormalisation scheme that includes mixed quar
k and gluon amputated vertex functions\, to directly compute the mixing re
normalisation factors. The method utilised exploits Feynman-Hellmann techn
iques to overcome troublesome statistical noise associated with singlet op
erators. The current demonstration is performed in the quenched approximat
ion\, with a straightforward generalisation to the dynamical case to be co
nsidered in near-future work.\n\nhttps://conference-indico.kek.jp/event/11
3/contributions/2105/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2105/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum Links for U(1) Gauge Theory on Qubits and Reduction to Z2
Gauge Theory and Toric Code
DTSTART:20200805T082000Z
DTEND:20200805T084000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2116@conference-indico.kek.jp
DESCRIPTION:Speakers: Hiroki Kawai (*) (Boston University)\, Cameron V. Co
gburn\, Richard C. Brower\, David Berenstein\n\nThe quantum link Hamiltoni
an was introduced two decades ago as an alternative to Wilson’s Euclidea
n lattice QCD with gauge fields represented by bi-linearfermion/anti-fermi
on operators\, and later generalized as D-theory. Recasting as a Hamiltoni
an in Minkowski space for real time evolution\, D-theory leads naturally
to quantum algorithms. We investigate the simplest toy model of U(1) comp
act QED on triangular 2+1D lattice and construct gauge invariant kernels v
ia the Suzuki-Trotter expansions which are realized as a quantum circuit c
apable of being tested on the Noisy Intermediate Scale Quantum (NISQ) devi
ces. We demonstrate the performance of our algorithm on the existing hard
ware called IBM-Q with error mitigation. Furthermore\, we also explore th
e similarity of our model to the Z2 gauge theory. Since its simplest examp
le without dynamics\, so-called toric code\, can be leveraged as the quant
um error correcting code\, we may find a clue to an efficient scalable err
or correction/detection algorithm specifically for our model based on the
relation between U(1) and Z2.\n\nhttps://conference-indico.kek.jp/event/11
3/contributions/2116/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2116/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Scattering of Goldstone bosons in SU(2) with Nf=2 fundamental ferm
ions
DTSTART:20200804T074000Z
DTEND:20200804T080000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2086@conference-indico.kek.jp
DESCRIPTION:Speakers: Vincent Drach (University of Plymouth)\, Antonio Rag
o\, Fernando Romero Lòpez\, Patrick Fritzsch\n\nWe present the first latt
ice calculation of the scattering amplitude of Goldstone bosons in the sin
glet channel relevant to test the viability of a composite Higgs scenario
beyond the Standard Model. In such a framework\, the scattering of the und
erlying Goldstone bosons controls the properties of the Higgs boson. The H
iggs boson properties are constrained by the Standard Model and experiment
ally measured by the CERN experiments and therefore provide stringent test
s 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 representation\, a m
inimal UV completion of a composite Higgs model. We calculate the scatter
ing amplitude near threshold of two of two Goldstone bosons in the singlet
channel. The first principle prediction sheds light on the viability of t
he model.\n\nhttps://conference-indico.kek.jp/event/113/contributions/2086
/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2086/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Three-Photon Decay of J/ψ from Latttice QCD
DTSTART:20200806T072000Z
DTEND:20200806T074000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2137@conference-indico.kek.jp
DESCRIPTION:Speakers: Yu Meng (*) (Peking University)\, Ke-Long Zhang (Pek
ing University)\, Chuan Liu (Peking University)\n\nThe rare decay J/ψ→3
γ\, analog to Ortho-positronium decaying to 3γ in quantum electrodynamic
s\, can provide a high precision test for the non-perturbative quantum chr
omodynamics. Such a decay process was first observed by CLEO collaboration
in 2008 and then by BESIII in 2013. However\, the relevant theoretical re
searches 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 met
hod has been proposed\, that only the correlation functions directly relat
ed to the physical decay width are computed with all polarizations of the
initial and final states summed over\, to avoid the complicated decomposit
ion for the matrix element. Using this new method\, we present the first l
attice result for this rare decay. Such a new method has also been applied
for the decay ηc→2γ\, and we obtain a lattice result that is consiste
nt with the experimental one within two standard deviations for the first
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 lattice
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:The Role of Boundary Conditions in Quantum Computations of Scatter
ing Observables
DTSTART:20200806T070000Z
DTEND:20200806T072000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2172@conference-indico.kek.jp
DESCRIPTION:Speakers: Alexandru Sturzu (*) (New College of Florida)\, Raul
Briceno\, Juan Guerrero\, Maxwell Hansen\n\nQuantum computing may offer t
he opportunity to simulate strongly-interacting field theories\, such as q
uantum chromodynamics\, with physical time evolution. This would give acce
ss to Minkowski signature correlators\, in contrast to the Euclidean calcu
lations routinely performed at present. However\, as with present-day calc
ulations\, quantum computation strategies still require the restriction to
a finite system size\, including a finite\, usually periodic\, spatial vo
lume. In this work\, we investigate the consequences of this in the extrac
tion of hadronic and Compton-like scattering amplitudes. Using the framewo
rk presented in Phys. Rev. D101 014509 (2020)\, we quantify the volume eff
ects for various 1 + 1D Minkowski-signature quantities and show that these
can be a significant source of systematic uncertainty\, even for volumes
that are very large by the standards of presentday Euclidean calculations.
We then present an improvement strategy\, based in the fact that the fini
te volume has a reduced symmetry. This implies that kinematic points\, whi
ch yield the same Lorentz invariants\, may still be physically distinct in
the finite-volume system. As we demonstrate\, both numerically and analyt
ically\, averaging over such sets can significantly suppress the unwanted
volume distortions and improve the extraction of the physical scattering a
mplitudes.\n\nhttps://conference-indico.kek.jp/event/113/contributions/217
2/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2172/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Shear viscosity of classical Yang-Mills field with use of scaling
invariance
DTSTART:20200806T054000Z
DTEND:20200806T060000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2133@conference-indico.kek.jp
DESCRIPTION:Speakers: Berndt M\\"{u}ller\, Teiji Kunihiro\, Toru T. Takaha
shi\, Akira Ohnishi\, Hidefumi Matsuda (*) (Kyoto University)\n\nWe report
on our recent results of the shear viscosity $\\eta$ of the classical Yan
g-Mills (CYM) field on a lattice by using the Green-Kubo formula\, where t
he shear viscosity is calculated from the time-correlation function of the
energy-momentum tensor in equilibrium. The point of our investigation con
sists in utilization of the inherent scale invariance of CYM\, and thereb
y the possible lattice-spacing dependence of the numerical results was cir
cumvented. Thus the dependence of the shear viscosity $\\eta(g\,T)$ on the
coupling $g$ 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
property of the CYM. The explicit functional form of $f_\\eta(g^2T)$ is su
ccessfully determined from the calculated shear viscosity: It turns out th
at $\\eta(g\,T)$ of the CYM field is proportional to $1/g^{1.10-1.88}$ at
weak coupling\, which has a weaker dependence\non $g$ than that in the lea
ding-order perturbation theory but consistent with that of the ""anomalous
viscosity"" $\\eta\\propto 1/g^{1.5}$ under the strong disordered field.\
nThe obtained shear viscosity is also found to be roughly consistent with
that estimated through the analysis of the anisotropy of the pressure of t
he CYM dynamics in the expanding geometry with recourse to a hydrodynamic
equation.\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:Chiral symmetry and taste symmetry on the eigenvalue spectrum of s
taggered Dirac operators
DTSTART:20200804T060000Z
DTEND:20200804T062000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2111@conference-indico.kek.jp
DESCRIPTION:Speakers: Chulwoo Jung\, Jangho Kim\, Jeehun Kim\, Youngjo Lee
\, Weonjong Lee\, Sunghee Kim\, Sunkyu Lee\, SWME Collaboration\, Jeonghwa
n Pak\, Nam Soo Kim\, Seungyeob Jwa\, Hwancheol Jeong (*) (Seoul National
University)\n\nChirality of HYP-smeared staggered quarks and its matrix el
ements on Dirac eigenspace are studied. We introduce a new chirality opera
tor and a new shift operator\, and show that chiral Ward identities relate
them. Leakage is defined as matrix elements between two eigenstates of th
e staggered Dirac operator\, which represents the transition matrix from o
ne eigenstate to the other. Numerical evidence of Ward identities on leaka
ge patterns for the chirality and shift operators is presented. We also sh
ow that approximate conservation of taste symmetry appears as a characteri
stic of leakage patterns of the chirality\, which allows us to distinguish
would-be zero modes from non-zero modes. The amount of the unphysical lea
kages indicates the size of the taste symmetry breaking.\n\nhttps://confer
ence-indico.kek.jp/event/113/contributions/2111/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2111/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fluctuations of conserved charges in a background magnetic field
DTSTART:20200804T072000Z
DTEND:20200804T074000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2127@conference-indico.kek.jp
DESCRIPTION:Speakers: Heng-Tong Ding (Central China Normal University) \,
Yu Zhang (Central China Normal University)\, Akio Tomiya (RIKEN BNL Resear
ch center\, Brookhaven National Laboratory)\, Xiao-Dan Wang (Central China
Normal University)\, Sheng-Tai Li (*) (Chinese Academy of Sciences (CAS)
- Institute of Modern Physics (IMP) & Central China Normal University)\n\n
We will present results on the second order fluctuations of net baryon num
ber\, electric charge and strangeness as well as correlations among these
conserved charges in (2+1)-flavor lattice QCD in the presence of a backgro
und magnetic field.\nSimulations are performed using the tree level improv
ed gauge action and the highly improved staggered quark\n(HISQ) action wit
h 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 i
s about 220 MeV at vanishing magnetic field. At zero temperature the simul
ations are performed on $32^3\\times96$ lattices while at nonzero temperat
ure on $32^3\\times N_\\tau$ lattices having six values of $N_\\tau$ varyi
ng from 16 to 6 corresponding to temperature ranging from 105 MeV to 280 M
eV. The magnetic field strength $eB$ is simulated with about 15 different
values up to 3.5 GeV$^2$ at each temperature. Chiral condensates and disco
nnected susceptibilities as a function of $eB$ are also discussed.\n\nhttp
s://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:Hadronic light-by-light contribution to $(g-2)_\\mu$ near the SU(3
)-flavor-symmetric point
DTSTART:20200805T052000Z
DTEND:20200805T054000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2082@conference-indico.kek.jp
DESCRIPTION:Speakers: Jeremy Green\, Renwick J. Hudspith\, Antoine Gérard
in\, Harvey B. Meyer\, Konstantin Ottnad\, En-Hung Chao (*) (Johannes Gute
nberg-Universität Mainz)\n\nUnderstanding the tension between the Standar
d Model prediction and the experimental results on the anomalous magnetic
moment of the muon (a_\\mu) has been an active research field over the pas
t two decades. The theoretical uncertainty mainly comes from the hadronic
contributions\, among which the hadronic light-by-light scattering ($a_\\m
u^{hlbl}$) process plays an important role. We investigate this contributi
on 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 p
art on the lattice\, which helps to avoid finite-size effects due to the p
hoton in finite-volume. However\, noticeable finite-size effects due to lo
ng-distance physics still persist in our approach. In our recent work [arX
iv:2006.16224]\, we have performed computations of $a_\\mu^{hlbl}$ on the
lattice with $N_f=3$ ensembles having degenerate light and strange quark m
asses. Our results have satisfactory statistical errors and allow us to co
ncentrate on our strategy to control the finite-size effects using the pio
n-exchange contribution. The extension of our setup to include non flavor-
symmetric ensembles does not require much effort\, thanks to the pre-compu
ted single-propagator trace in position space shared among other Mainz pro
jects. Our work in progress toward the physical point will be briefly repo
rted\, with focus on the Wick-contraction topologies that vanish at the fl
avor-symmetric point.\n\nhttps://conference-indico.kek.jp/event/113/contri
butions/2082/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2082/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Two-current Correlations and the Pion Valence Quark Distribution f
rom Lattice QCD
DTSTART:20200807T074000Z
DTEND:20200807T080000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2087@conference-indico.kek.jp
DESCRIPTION:Speakers: R. Edwards\, J. Karpie\, Y.-Q. Ma\, HadStruc Collabo
ration\, J.-W. Qiu\, B. Joo\, K. Orginos\, D. Richards\, R.S. Sufian\, Col
in Egerer (*) (William & Mary)\n\nAn understanding of the partonic structu
re of hadrons is an essential ingredient in making precise predictions and
measurements of hadronic cross-sections and various Standard\, and Beyond
Standard\, Model parameters. Several encouraging proposals have been deve
loped in the past decade that relate lattice calculable quantities with PD
Fs via frameworks akin to QCD factorization. We report results of one such
LQCD formalism\, wherein the pion valence quark distribution is extracted
through a short-distance collinear factorization of space-like separated
vector and axial-vector current correlations. A simultaneous fit of such m
atrix elements computed on four distinct gauge ensembles\, including syste
matic 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-$x$ region\, and offers tantaliz
ing clues to its large-$x$ behavior. We further demonstrate the recently d
erived one-loop matching coefficient that is central to this work has a we
ll-controlled behavior in Ioffe-time.\n\nhttps://conference-indico.kek.jp/
event/113/contributions/2087/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2087/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Simulation of complexified U(1) lattice gauge theory
DTSTART:20200805T050000Z
DTEND:20200805T052000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2195@conference-indico.kek.jp
DESCRIPTION:Speakers: Felix Ziesché\, Christian Schmidt\, Manuel Scherzer
\, Jan M. Pawlowski\, Felix Ziegler (*) (University of Southern Denmark (S
DU))\n\nWe present an update on our previous studies [1] of pure U(1) lat
tice gauge theory with a sign problem due to a complex coupling \\beta. To
that end a novel simulation method is employed:\nConfiguration space is r
ewritten as a union of linear submanifolds in complexified space. These s
ubmanifolds are the tangent spaces of the Lefschetz thimble decomposition.
Therefore the sign problem is drastically reduced.\nTangent spaces are in
finite spaces\, so we specify boundaries for them\, such that homotopy to
real field space is in the end ensured.\nThe Monte Carlo simulation is set
up 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
we can monitor their respective contributions one by one. The relative we
ights are computed via reweighting.\nWe discuss simulation results includi
ng the scaling of the sign problem with the number of tangent spaces. In p
articular\, promising results are obtained for the beta_I / beta_R > 1 reg
ion 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. Ziesc
hé\, „Simulating gauge theories on Lefschetz thimbles“\, \, 37th Inte
rnational 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:Parton Distribution Functions from pseudo-distributions
DTSTART:20200807T054000Z
DTEND:20200807T060000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2067@conference-indico.kek.jp
DESCRIPTION:Speakers: Aurora Scapellato\, Krzysztof Cichy\, Martha Constan
tinou \, Manjunath Bhat (*) (Adam Mickiewicz University)\n\nWe present a d
etailed study of the nucleon unpolarized parton distribution function (PDF
) using the approach of parton pseudo-distribution functions. We 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 physic
al Ioffe time distributions are obtained from the nucleon matrix elements
extracted from lattice simulations through a matching procedure. We recons
truct the PDF using different approaches. Using a direct Fourier transform
of Ioffe-time data poses an inverse problem\, due to the ill-defined inve
rse equation. We use two advanced reconstruction techniques to tackle this
problem: the Backus-Gilbert method and fitting data to a suitable functio
n as implied by global fitting in phenomenology. We fit the real and imagi
nary parts of Ioffe-time data to the cosine and sine Fourier transform of
$x^a(1-x)^b$ type function\, respectively. We find good agreement with PD
Fs from global fits and it is further improved by quantifying several syst
ematic effects.\n\nhttps://conference-indico.kek.jp/event/113/contribution
s/2067/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2067/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A non-perturbative renormalization scheme with the gradient flow
DTSTART:20200806T062000Z
DTEND:20200806T064000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2161@conference-indico.kek.jp
DESCRIPTION:Speakers: Christopher Monahan\, Andrea Shindler\, Oliver Witze
l\, Anna Hasenfratz\, Matthew Rizik (*) (National Superconducting Cyclotro
n Laboratory\, Michigan State University)\n\nThe range of energy scales no
rmally accessible by large-volume lattice computations is typically fairly
limited\n($1/a simeq 1-4$ GeV) and potentially insufficient to reproduce
high-energy perturbative results.\nIn order to match lattice results with
more phenomenologically amenable schemes\, such as the $\\bar{MS}$ scheme\
, we must evolve the non-perturbative results to higher energies where mat
ching with perturbation theory is possible.\nWe thereupon present a method
to determine both the renormalization constants and anomalous dimensions
for local operators by studying ratios and double ratios of correlation fu
nctions both in continuum perturbation theory and on the lattice. In parti
cular\, we employ the Yang-Mills\n(Wilson) gradient flow to parametrize th
e renormalization scale.\nThis has two major benefits. On the lattice\, th
e introduction of the flow time fixes the energy scale\, which permits a c
ontinuum limit free from power divergences in the lattice spacing due to o
perator mixing.\nFurther\, while the gradient flow slightly complicates pe
rturbation theory\, it has been shown that all gauge fields in the bulk ar
e intrinsically renormalized.\nFocusing on massless fermion bilinears\, we
study correlation functions at positive flow time at leading and next-to-
leading order in perturbation theory with $\\bar{MS}$ subtraction. Through
renormalization group equations\, it is possible to match these correlato
rs to lattice data at the hadronic scale\,\nwith the goal of identifying a
n 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:Semileptonic $B_s \\to K$ and $B_s \\to D_s$ decays
DTSTART:20200805T070000Z
DTEND:20200805T072000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2176@conference-indico.kek.jp
DESCRIPTION:Speakers: Jonathan Flynn\, Oliver Witzel\, Amarjit Soni\, Ryan
Hill\, RBC/UKQCD collaborations\, Andreas Jüttner\, J Tobias Tsang (*) (
University of Southern Denmark\, CP3)\n\nWe present our results for the se
mileptonic formfactors of exclusive $B_s \\to K \\ell \\nu$ and $B_s \\to
D_s \\ell \\nu$ decays. The calculation is based on RBC/UKQCD's set of 2+1
dynamical flavour gauge field ensembles spanning three lattice spacings.
We use domain wall fermions for the valence up/down\, strange and charm qu
arks whilst the bottom quark is simulated using the relativistic heavy qua
rk action. After presenting the extrapolation to zero lattice spacing and
physical quark masses we show our complete error budget and kinematic extr
apolations over the entire $q^2$ range.\nUsing our results we predict rati
os which serve as tests of lepton flavour universality. These form factors
can be combined with experimental data (where available) to extract the C
KM matrix elements $V_{ub}$ and $V_{cb}$\, complimentary to extractions fr
om $B \\to \\pi \\ell \\nu$ and $B \\to D \\ell \\nu$.\n\nhttps://conferen
ce-indico.kek.jp/event/113/contributions/2176/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2176/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Charmed baryon spectroscopy from lattice QCD near the physical poi
nt
DTSTART:20200806T074000Z
DTEND:20200806T080000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2096@conference-indico.kek.jp
DESCRIPTION:Speakers: Philipp Gubler (JAEA)\, TRJQCD Collaboration\n\nThe
low-lying spectrum of charmed baryons is calculated in lattice QCD on the
$32^3 \\times 64$\, $N_f = 2 + 1$ PACS-CS gauge configurations at the almo
st physical pion mass of 156 $MeV/c^2$. By employing a set of interpolatin
g operators with different Dirac structures and quark-field smearings for
the variational analysis\, we extract the ground and first few excited sta
tes of the spin-1/2 and spin-3/2\, singly-\, doubly-\, and triply-charmed
baryons.\n\nhttps://conference-indico.kek.jp/event/113/contributions/2096/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2096/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Low-lying charmonium properties from lattice QCD + quenched QED
DTSTART:20200806T080000Z
DTEND:20200806T082000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2100@conference-indico.kek.jp
DESCRIPTION:Speakers: Andrew Lytle\, Jonna Koponen\, G. Peter Lepage\, HPQ
CD Collaboration\, Christine Davies\, Daniel Hatton (*) (University of Gl
asgow)\n\nThe properties of low-lying charmonium mesons offer points of hi
gh precision comparison between lattice QCD and experiment\, if discretisa
tion effects set by the charm quark mass can be controlled. Using $n_f=2+1
+1$ configurations with the HISQ action\, developed by the HPQCD collabora
tion to have very small discretisation errors\, we achieve precision at or
below the 1% level for a range of quantities. These include the hyperfine
splitting\, the $J/\\psi$ vector (and tensor) decay constants and the cha
rm connected hadronic vacuum polarisation contribution to the anomalous ma
gnetic moment of the muon. For the last of these we are able to obtain a r
esult with a 0.3% uncertainty. At this level of precision it is necessary
to understand leading electromagnetic effects which we do through the incl
usion of quenched QED. One such effect that must be accounted for is the e
lectromagnetic effect on the tuning of the charm mass in our calculations.
The meson mass shift from QED may be separated into contributions from th
e quark self energy and the physical contribution from the Coulomb potenti
al. We extract the Coulomb potential contribution and compare with expecta
tions from potential models.\n\nhttps://conference-indico.kek.jp/event/113
/contributions/2100/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2100/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sparse modeling approach to obtaining the shear viscosity from sme
ared correlation functions
DTSTART:20200806T060000Z
DTEND:20200806T062000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2108@conference-indico.kek.jp
DESCRIPTION:Speakers: Etsuko Itou (Keio university)\, Yuki Nagai\n\nWe pro
pose the sparse modeling method to estimate the spectral function from the
smeared correlation functions. We give a description of how to obtain the
shear viscosity from the correlation function of the renormalized energy-
momentum tensor (EMT) measured by the gradient flow method (C(t\,τ)) for
the quenched QCD at finite temperature. The measurement of the renormalize
d EMT in the gradient flow method reduces a statistical uncertainty thanks
to its property of the smearing. However\, the smearing breaks the sum ru
le of the spectral function and the over-smeared data in the correlation f
unction may have to be eliminated from the analyzing process of physical o
bservables. In this work\, we demonstrate that the sparse modeling analysi
s in the intermediate-representation basis (IR basis)\, which connects bet
ween the Matsubara frequency data and real frequency data. It works well e
ven 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 reproduces the input smeared correlation function at finite flow-
time. Several systematic and statistical errors and the flow-time dependen
ce are also discussed.\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:Near-conformal dynamics in a chirally broken system
DTSTART:20200804T050000Z
DTEND:20200804T052000Z
DTSTAMP:20240302T221100Z
UID:indico-contribution-2188@conference-indico.kek.jp
DESCRIPTION:Speakers: Oliver Witzel (University of Colorado Boulder)\, Lat
tice Strong Dynamics Collaboration\n\nComposite Higgs models must exhibit
very different dynamics from quantum chromodynamics (QCD) regardless wheth
er they describe the Higgs boson as a dilaton-like state or a pseudo-Nambu
-Goldstone boson. Large separation of scales and large anomalous dimension
s are frequently desired by phenomenological models. Mass-split systems a
re well-suited for composite Higgs models because they are governed by a c
onformal fixed point in the ultraviolet but are chirally broken in the inf
rared. In this work we use lattice field theory calculations with domain
wall fermions to investigate a system with four light and six heavy flavor
s. We demonstrate how a nearby conformal fixed point affects the propert
ies of the four light flavors that exhibit chiral symmetry breaking in the
infrared. Specifically we describe hyperscaling of dimensionful physical
quantities and determine the corresponding anomalous mass dimension. We o
btain y_m=1+gamma^*= 1.47(5) suggesting that N_f=10 lies inside the confor
mal window. Comparing the low energy spectrum to predictions of dilaton ch
iral perturbation theory\, we observe excellent agreement which supports t
he expectation that the 4+6 mass-split system exhibits near-conformal dyna
mics with a relatively light 0^++ isosinglet scalar.\n\nhttps://conference
-indico.kek.jp/event/113/contributions/2188/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2188/
END:VEVENT
END:VCALENDAR