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BEGIN:VEVENT
SUMMARY:Bringing scattering data to the finite volume of lattice QCD
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UID:indico-contribution-770-2058@conference-indico.kek.jp
DESCRIPTION:Speakers: Curtis Abell (*) (University of Adelaide)\nHamiltoni
an effective field theory (HEFT) is an approach which allows for the extra
ction of hadron finite-volume energy spectra from scattering observables s
uch as phase shifts and inelasticities. As an alternative to Luscher's met
hod\, HEFT easily generalises to systems with multiple coupled channels an
d multiple bare states. HEFT also allows for the extraction of eigenvector
s from the Hamiltonian\, providing new insight into the composition of fin
ite-volume eigenstates and their dependence on the lattice volume. In this
presentation we’ll explore renormalisation in HEFT using pion-nucleon s
cattering data in the Delta resonance channel. By examining the compositio
n of the Delta resonance and its dependence on the regulator parameter\, c
onnections with alternative renormalisation schemes are made.\n\nhttps://c
onference-indico.kek.jp/event/113/contributions/2058/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2058/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Study of the rho resonance using the HAL QCD method
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UID:indico-contribution-770-2060@conference-indico.kek.jp
DESCRIPTION:Speakers: Yutaro Akahoshi (*) (Yukawa Institute for Theoretica
l Physics\, Kyoto University)\nIn this talk\, we show the recent status of
the rho resonance study in the HAL QCD method.\nWe investigate the I=1 tw
o-pion potential at $m_{\\pi} \\approx 411$ MeV by using a new calculation
strategy\, namely the combination of three techniques: the one-end trick\
, the sequential propagator\, and covariant approximation averaging (CAA).
\nThanks to the new strategy\, we determine the non-local I=1 two-pion pot
ential at the next-leading-order of the derivative expansion for the first
time and obtain the pole of the S-matrix corresponding to the rho resonan
ce.\nAs regards the resonance parameters\, our resonance mass is consisten
t with the previous study using the finite-volume method\, but slightly la
rger decay width and coupling are obtained. We discuss possible origins of
this difference.\n\nhttps://conference-indico.kek.jp/event/113/contributi
ons/2060/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2060/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Magnetic Polarisability with the background Field Method
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UID:indico-contribution-770-2069@conference-indico.kek.jp
DESCRIPTION:Speakers: Ryan Bignell (*) (University of Adelaide)\nThe magne
tic polarisability is a fundamental property of hadrons\, which provides i
nsight into their structure in the low-energy regime. The pion magnetic po
larisability is calculated using lattice QCD in the presence of background
magnetic fields. The results presented are facilitated by the introductio
n of a new magnetic-field dependent quark-propagator eigenmode projector a
nd the use of the background-field corrected clover fermion action. The ma
gnetic polarisabilities are calculated in a relativistic formalism\, and t
he excellent signal-to-noise property of pion correlation functions facili
tates precise values.\n\nhttps://conference-indico.kek.jp/event/113/contri
butions/2069/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2069/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Finite volume effects and meson scattering in the 2-flavour Schwin
ger model
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UID:indico-contribution-770-2076@conference-indico.kek.jp
DESCRIPTION:Speakers: Patrick Bühlmann (*) (University of Bern)\nWe inves
tigate the two-flavour Schwinger model in the canonical formulation with f
ixed fermion number.\nWe use Wilson fermions on the lattice and present a
formalism which describes the Dirac operator with dimensionally reduced ca
nonical operators.\nThese reduced operators allow the direct examination o
f different meson sectors and the determination of the energy spectrum in\
neach of the sectors. Using Lüscher's finite-volume mass-shift formula we
discuss the 1-meson mass as well as the effective 3-meson coupling.\nFrom
the 2-meson energies we determine the scattering phase shifts and compare
the 3-meson energies in the finite volume to various\npredictions based o
n scattering theory.\n\nhttps://conference-indico.kek.jp/event/113/contrib
utions/2076/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2076/
END:VEVENT
BEGIN:VEVENT
SUMMARY:P-wave form factors from the inclusive semileptonic $B \\ rightarr
ow X_c \\ell \\nu$ decays
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UID:indico-contribution-770-2065@conference-indico.kek.jp
DESCRIPTION:Speakers: Gabriela Bailas (*) (KEK)\nWe report our estimation
for the Isgur-Wise form factors for the inclusive semileptonic $B \\to X_c
\\ell\\nu$ on 2+1-flavor lattice QCD. \nThe M\\"obius domain-wall fermion
action is used for light\, strange\, charm and bottom quarks. The structu
re function receives contributions from various exclusive modes\, includin
g the dominant S-wave states $D^{(*)}_s$ as well as the P-wave states $D_s
^{**}$. In this work\, we identify and separate these contributions in the
lattice data\, from \nwhich we put some constraints on the $B_s \\to D_s^
{**}\\ell\\nu$ form factors. Our work takes into account the structure fun
ctions for the cases of zero-recoil and non-zero recoil.\n\nhttps://confer
ence-indico.kek.jp/event/113/contributions/2065/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2065/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hybrid static potentials at small quark-antiquark separations
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UID:indico-contribution-770-2159@conference-indico.kek.jp
DESCRIPTION:Speakers: Carolin Riehl (*) (Goethe University Frankfurt)\nWe
compute hybrid static potentials in SU(2) lattice gauge theory using a mul
tilevel algorithm and three different small lattice spacings. The resultin
g static potentials\, which are valid for quark-antiquark separations as s
mall as 0.05 fm\, are important e.g. when computing masses of heavy hybrid
mesons in the Born-Oppenheimer approximation. We also discuss and exclude
possible systematic errors from topological freezing\, the finite lattice
volume and glueball decays.\n\nhttps://conference-indico.kek.jp/event/113
/contributions/2159/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2159/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Finite-volume scattering formalism for all three-pion isospin chan
nels
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UID:indico-contribution-770-2196@conference-indico.kek.jp
DESCRIPTION:Speakers: Maxwell Hansen (CERN)\nI summarize recent work (arXi
v:2003.10974) providing a generalization of finite-volume scattering forma
lism for non-identical pions in isosymmetric QCD. The result allows one to
use discrete finite-volume energies\, determined using lattice QCD\, to c
onstrain scattering amplitudes for all possible values of two- and three-p
ion isospin. As an example\, I present a toy implementation for I(πππ)
= 0\, focusing on the quantum numbers of the ω and h1 resonances.\n\nhttp
s://conference-indico.kek.jp/event/113/contributions/2196/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2196/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bottomonium resonances from lattice QCD static-static-light-light
potentials
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UID:indico-contribution-770-2142@conference-indico.kek.jp
DESCRIPTION:Speakers: Lasse Mueller (*) (Goethe University Frankfurt)\nWe
study I = 0 quarkonium resonances decaying into pairs of heavy-light meson
s using static-static-light-light potentials from lattice QCD. To this end
\, we solve a coupled channel Schrödinger equation with one confined quar
konium channel and two channels with a heavy-light meson pair to compute p
hase shifts and t-matrix poles for the lightest decay channel. Finally\, w
e discuss our results in the context of corresponding experimental results
.\n\nhttps://conference-indico.kek.jp/event/113/contributions/2142/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2142/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sigma-Lambda state mixing from lattice QCD+QED
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UID:indico-contribution-770-2120@conference-indico.kek.jp
DESCRIPTION:Speakers: Zeno Kordov (*) (The University of Adelaide)\nMixing
in the $\\Sigma^0$--$\\Lambda^0$ system is a direct consequence of broken
isospin symmetry and is a measure of both isospin-symmetry breaking as we
ll as general SU(3)-flavour symmetry breaking. In this talk we present a n
ovel scheme for calculating the extent of the physical $\\Sigma^0$--$\\Lam
bda^0$ mixing using simulations in lattice QCD+QED and discuss some of its
features and initial results.\n\nhttps://conference-indico.kek.jp/event/1
13/contributions/2120/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2120/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Studies on meson-baryon interactions in the HAL QCD method with al
l-to-all propagators
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DTSTAMP;VALUE=DATE-TIME:20231130T084307Z
UID:indico-contribution-770-2143@conference-indico.kek.jp
DESCRIPTION:Speakers: Kotaro Murakami (*) (Yukawa Institute for Theoretica
l Physics\, Kyoto University)\nWe investigate meson-baryon interactions in
the HAL QCD method with all-to-all propagators using the stochastic estim
ations. We mainly report the analysis of the S-wave kaon-nucleon interacti
ons at $m_{\\pi} \\approx 570$ MeV. Since there are no quark-antiquark cre
ation/annihilation processes in this system\, all-to-all propagators merel
y play a role in increasing statistics. In addition\, we present the preli
minary results for the P-wave pion-nucleon interaction in the $I=3/2$ chan
nel using the $\\Delta$ source operator on a small volume at $m_{\\pi} \\
approx 870$ MeV\, which has a bound state corresponding to the $\\Delta$(1
232) state.\n\nhttps://conference-indico.kek.jp/event/113/contributions/21
43/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2143/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Investigation of Doubly Heavy Tetraquark Systems using Lattice QCD
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DTSTAMP;VALUE=DATE-TIME:20231130T084307Z
UID:indico-contribution-770-2157@conference-indico.kek.jp
DESCRIPTION:Speakers: Martin Pflaumer (*) (Goethe University Frankfurt)\nW
e search for possibly existent bound states in the heavy-light tetraquark
channels with quark content $ \\bar{b}\\bar{b}ud $\, $ \\bar{b}\\bar{b}us
$ and $ \\bar{b}\\bar{c}ud $ using lattice NRQCD for the heavy quarks. We
use different gauge link ensembles with $ N_f=2+1 $ flavours of domain-wal
l fermions and consider a basis of local and non-local interpolators. Besi
des extracting the energy spectrum from the correlation matrix\, we perfor
m additionally a Lüscher analysis to extrapolate our results to infinite
volume.\n\nhttps://conference-indico.kek.jp/event/113/contributions/2157/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2157/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chiral symmetry and the Roper resonance
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DTSTAMP;VALUE=DATE-TIME:20231130T084307Z
UID:indico-contribution-770-2180@conference-indico.kek.jp
DESCRIPTION:Speakers: Adam Virgili (*) (University of Adelaide)\nThe origi
n of the low-lying nature of the Roper resonance has been the subject of s
ignificant interest for many years\, including several investigations usin
g lattice QCD. It has been claimed that chiral symmetry plays an important
role in our understanding of this resonance. We present results from our
systematic examination of the potential role of chiral symmetry in the low
-lying nucleon spectrum through the direct comparison of the clover and ov
erlap fermion actions. After a brief summary of the background motivation\
, we specify the computational details of the study and outline our compar
ison methodologies. We do not find any strong evidence supporting the clai
m that chiral symmetry plays a significant role in understanding the Roper
resonance on the lattice.\n\nhttps://conference-indico.kek.jp/event/113/c
ontributions/2180/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2180/
END:VEVENT
BEGIN:VEVENT
SUMMARY:From QCD string breaking to quarkonium spectrum
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DTEND;VALUE=DATE-TIME:20200806T074000Z
DTSTAMP;VALUE=DATE-TIME:20231130T084307Z
UID:indico-contribution-770-2080@conference-indico.kek.jp
DESCRIPTION:Speakers: Marco Catillo (*) (Ludwig Maximilian University of M
unich)\nSignal-to-noise problem and excited states contamination\, inter a
lia\, make studies of the QCD string breaking phenomenon a challenging tas
k in lattice QCD. The static quark potentials produced for these studies c
an be combined with the Born Oppenheimer approximation to give an importan
t insight into I=0 quarkonium resonances. Precise determination of various
lattice potentials are also needed for better understanding of the bound
states and hybrid mesons recently observed at LHC and other experiments. I
n this talk\, we present preliminary results on the Wilson loop correlator
s and compare smeared and unsmeared static potentials for two flavour QCD
with improved Wilson fermions. The systematic errors are reduced by solvin
g the generalised eigenvalue problem.\n\nhttps://conference-indico.kek.jp/
event/113/contributions/2080/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2080/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Equivalence of three-particle quantization conditions
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DTEND;VALUE=DATE-TIME:20200804T060000Z
DTSTAMP;VALUE=DATE-TIME:20231130T084307Z
UID:indico-contribution-770-2168@conference-indico.kek.jp
DESCRIPTION:Speakers: Stephen Sharpe (University of Washington)\nWe show t
hat a recently derived alternative form of the relativistic three-particle
quantization condition for identical particles can be rewritten in terms
of the R matrix introduced to give a unitary representation of the infinit
e-volume three-particle scattering amplitude. Combined with earlier work\,
this shows the equivalence of the relativistic effective field theory app
roach of Refs. [1\, 2] and the “finite-volume unitarity” approach of R
efs. [3\, 32]. It also provides a generalization of the latter approach to
arbitrary angular momentum of two-particle subsystems.\n\nhttps://confere
nce-indico.kek.jp/event/113/contributions/2168/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2168/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quark composition and color structure of heavy-heavy mesons and te
traquarks
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DTEND;VALUE=DATE-TIME:20200804T082000Z
DTSTAMP;VALUE=DATE-TIME:20231130T084307Z
UID:indico-contribution-770-2181@conference-indico.kek.jp
DESCRIPTION:Speakers: Marc Wagner (Goethe University Frankfurt)\nWe explor
e the quark composition of bottomonium bound states and resonances with I
= 0 and L = 0 using lattice QCD static potentials from a previous study of
string breaking and the Born-Oppenheimer approximation. We also compare t
he relative importance of meson-meson and diquark-antidiquark creation ope
rators for the lattice QCD static potential relevant for b-bar b-bar u d t
etraquarks with I = 0.\n\nhttps://conference-indico.kek.jp/event/113/contr
ibutions/2181/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2181/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nuclear force from lattice QCD with LapH smearing
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DTEND;VALUE=DATE-TIME:20200807T062000Z
DTSTAMP;VALUE=DATE-TIME:20231130T084307Z
UID:indico-contribution-770-2173@conference-indico.kek.jp
DESCRIPTION:Speakers: Takuya Sugiura (*) (RIKEN iTHEMS)\nRecent studies by
HAL QCD collaboration have been successful in calculating hadron interact
ions from the first principles of QCD. In this talk\, we apply the Laplaci
an Heaviside (LapH) smearing for the two nucleon source operator to enhanc
e overlap with the low-energy elastic states and calculate the s-wave nucl
ear force. Our potential with the LapH smeared source has similar structur
e and comparable statistical errors to that with the standard wall source
operator. This will be an important step towards future extension to the P
-wave nuclear forces.\n\nhttps://conference-indico.kek.jp/event/113/contri
butions/2173/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2173/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Glueball dark matter in SU(N) lattice gauge theory
DTSTART;VALUE=DATE-TIME:20200807T062000Z
DTEND;VALUE=DATE-TIME:20200807T064000Z
DTSTAMP;VALUE=DATE-TIME:20231130T084307Z
UID:indico-contribution-770-2192@conference-indico.kek.jp
DESCRIPTION:Speakers: Nodoka Yamanaka (University of Massachusetts Amherst
)\nThe glueballs in the SU(N) Yang-Mills theory are theoretically the most
natural among composite dark matter scenarios.\nIn this work\, we evaluat
e the interglueball potential in SU(N) lattice gauge theories using the HA
LQCD method and derive the glueball dark matter scattering cross section\,
and then constrain the scale parameter of the gauge theory from the obser
vational data.\n\nhttps://conference-indico.kek.jp/event/113/contributions
/2192/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2192/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alternative derivation of relativistic three-particle quantization
condition
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DTEND;VALUE=DATE-TIME:20200804T054000Z
DTSTAMP;VALUE=DATE-TIME:20231130T084307Z
UID:indico-contribution-770-2070@conference-indico.kek.jp
DESCRIPTION:Speakers: Tyler Blanton (*) (University of Washington)\nWe pre
sent a simplified derivation of the relativistic three-particle quantizati
on condition for identical\, spinless particles. The simplification is aff
orded by using time-ordered perturbation theory (TOPT) and a three-particl
e quasilocal K matrix that is not fully symmetrized to organize the releva
nt diagrams in an intuitive manner\, ultimately leading to a new form of t
he quantization condition. This form can then be related algebraically to
both the standard quantization condition\, which uses a fully symmetric th
ree-particle K matrix\, and the quantization condition based on extending
unitary representations of the three-particle amplitude to finite volume.
It should also allow a more straightforward generalization of the quantiza
tion condition to nondegenerate particles\, and perhaps also to more than
three particles.\n\nhttps://conference-indico.kek.jp/event/113/contributio
ns/2070/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2070/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Charmed baryon spectroscopy from lattice QCD near the physical poi
nt
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DTEND;VALUE=DATE-TIME:20200806T080000Z
DTSTAMP;VALUE=DATE-TIME:20231130T084307Z
UID:indico-contribution-770-2096@conference-indico.kek.jp
DESCRIPTION:Speakers: Philipp Gubler (JAEA)\nThe low-lying spectrum of cha
rmed baryons is calculated in lattice QCD on the $32^3 \\times 64$\, $N_f
= 2 + 1$ PACS-CS gauge configurations at the almost physical pion mass of
156 $MeV/c^2$. By employing a set of interpolating operators with differen
t Dirac structures and quark-field smearings for the variational analysis\
, we extract the ground and first few excited states of the spin-1/2 and s
pin-3/2\, singly-\, doubly-\, and triply-charmed baryons.\n\nhttps://confe
rence-indico.kek.jp/event/113/contributions/2096/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2096/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Low-lying charmonium properties from lattice QCD + quenched QED
DTSTART;VALUE=DATE-TIME:20200806T080000Z
DTEND;VALUE=DATE-TIME:20200806T082000Z
DTSTAMP;VALUE=DATE-TIME:20231130T084307Z
UID:indico-contribution-770-2100@conference-indico.kek.jp
DESCRIPTION:Speakers: Daniel Hatton (*) (University of Glasgow)\nThe prop
erties of low-lying charmonium mesons offer points of high precision compa
rison between lattice QCD and experiment\, if discretisation effects set b
y the charm quark mass can be controlled. Using $n_f=2+1+1$ configurations
with the HISQ action\, developed by the HPQCD collaboration to have very
small discretisation errors\, we achieve precision at or below the 1% leve
l for a range of quantities. These include the hyperfine splitting\, the $
J/\\psi$ vector (and tensor) decay constants and the charm connected hadro
nic vacuum polarisation contribution to the anomalous magnetic moment of t
he muon. For the last of these we are able to obtain a result with a 0.3%
uncertainty. At this level of precision it is necessary to understand lead
ing electromagnetic effects which we do through the inclusion of quenched
QED. One such effect that must be accounted for is the electromagnetic eff
ect on the tuning of the charm mass in our calculations. The meson mass sh
ift from QED may be separated into contributions from the quark self energ
y and the physical contribution from the Coulomb potential. We extract the
Coulomb potential contribution and compare with expectations from potenti
al models.\n\nhttps://conference-indico.kek.jp/event/113/contributions/210
0/
LOCATION:online
URL:https://conference-indico.kek.jp/event/113/contributions/2100/
END:VEVENT
END:VCALENDAR