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SUMMARY:Portraits of Charmoniumlike States
DTSTART;VALUE=DATE-TIME:20261010T074000Z
DTEND;VALUE=DATE-TIME:20261010T075500Z
DTSTAMP;VALUE=DATE-TIME:20261005T011820Z
UID:indico-contribution-641-2838@indico.itp.ac.cn
DESCRIPTION:Speakers: 清扬 刘 (ihep)\nThe charm quark density-density c
 orrelation is calculated for 1S and 1P conventional charmonia and $J^{PC}=
 1^{−+}\,0^{+−}$ charmoniumlike states from lattice QCD and are interpr
 eted as spatial wave functions of these states with some approximations. T
 he angular distributions of $c\\bar{c}$ in conventional charmonia are foun
 d to be in accordance with the expectation of two-body systems\, while tha
 t of the $1^{−+}$ state exhibits an S-wave feature. However\, the $c\\ba
 r{c}$ radial distributions turn out to be strikingly different from the no
 n-relativistic quark model and can be understood by the Dirac theory of tw
 o-body bound states. These results provide the first gauge invariant and m
 odel-independent three-dimensional portraits of charmonium(like) states.\n
 \nhttps://indico.itp.ac.cn/event/437/contributions/2838/
LOCATION:会议楼2 CXII102
URL:https://indico.itp.ac.cn/event/437/contributions/2838/
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BEGIN:VEVENT
SUMMARY:η and η' mesons from lattice QCD
DTSTART;VALUE=DATE-TIME:20261010T072500Z
DTEND;VALUE=DATE-TIME:20261010T074000Z
DTSTAMP;VALUE=DATE-TIME:20261005T011820Z
UID:indico-contribution-641-2844@indico.itp.ac.cn
DESCRIPTION:Speakers: 立强 李 (河北大学)\nUnderstanding the masses 
 of $\\eta$ and $\\eta$' mesons as well as the mixing between the original 
 flavor singlet state and the neutral octet state is an important topic in 
 low-energy strong-interaction physics. We determine masses and mixing angl
 e of the $\\eta$ and $\\eta$' mesons in lattice QCD. The calculations are 
 carried out on a set of 13 CLQCD gauge ensembles with $N_f$ = 2 + 1 Wilson
 -Clover quarks. These ensembles cover three values of the lattice spacing 
 a = 0.105\, 0.077\, 0.052fm and pion masses from 136 to 317MeV\, including
  two ensembles at physical pion mass. In all ensembles\, we used all-to-al
 l quark propagators\, named perambulators\, generated via a distillation s
 mearing algorithm to improve signal quality. The fitting results indicate 
 that the perambulators perform well for both connected and disconnected di
 agrams of the correlation function\, without requiring too many configurat
 ions. This provides a solid foundation for accurately calculating the mass
 es of the $\\eta$ and $\\eta$' mesons\, especially the $\\eta$'.\n\nhttps:
 //indico.itp.ac.cn/event/437/contributions/2844/
LOCATION:会议楼2 CXII102
URL:https://indico.itp.ac.cn/event/437/contributions/2844/
END:VEVENT
BEGIN:VEVENT
SUMMARY:calculate Λ → pℓ¯νℓ semileptonic decay in lattice QCD
DTSTART;VALUE=DATE-TIME:20261010T071000Z
DTEND;VALUE=DATE-TIME:20261010T072500Z
DTSTAMP;VALUE=DATE-TIME:20261005T011820Z
UID:indico-contribution-641-2818@indico.itp.ac.cn
DESCRIPTION:Speakers: 鉴 郭 (中国科学院近代物理研究所)\nThis
  work presents a non-perturbative lattice-QCD study of the semileptonic de
 cay \\(\\Lambda \\to p\\ell\\bar{\\nu}_{\\ell}\\)\, where \\(\\ell=e\,\\mu
 \\). The main objective is to calculate the hadronic transition matrix ele
 ment\n\n$$\n\\langle p|\\bar{u}\\gamma^\\mu(1-\\gamma_5)s|\\Lambda\\rangle
 \n$$\n\nand extract the corresponding vector and axial-vector form factors
 .\n\nTwo-point and three-point correlation functions are constructed on th
 e lattice. Excited-state contamination is reduced using the summation meth
 od\, correlated global fits\, and jackknife resampling. The momentum-trans
 fer dependence of the form factors is described using a model-independent 
 \\(z\\)-expansion with the appropriate kinematic constraints.\n\nThe extra
 cted form factors are then used to calculate the differential and total de
 cay rates\,\n\n$$\n\\Gamma_\\ell\n=\n\\int_{m_\\ell^2}^{(m_\\Lambda-m_N)^2
 }\ndq^2\\\,\n\\frac{d\\Gamma_\\ell}{dq^2}\,\n$$\n\nand to determine the CK
 M matrix element \\(\\lvert V_{us}\\rvert\\). Using experimental baryon ma
 sses\, the resulting muon-to-electron decay-rate ratio is\n\n$$\nR_{\\mu/e
 }=0.16464(18)\,\n$$\n\nwhile the extracted values of \\(\\lvert V_{us}\\rv
 ert\\) are\n\n$$\nV_{us\,e}=0.2438(21)\,\nV_{us\,\\mu}=0.2557(161).\n$$\n\
 nThe study demonstrates the feasibility of determining \\(\\Lambda\\)-bary
 on semileptonic form factors from lattice QCD. Further calculations with m
 ultiple lattice spacings\, improved mass tuning\, and continuum extrapolat
 ion are required for a precision determination of \\(\\lvert V_{us}\\rvert
 \\).\n\\langle p|\\bar{u}\\gamma^\\mu(1-\\gamma_5)s|\\Lambda\\rangle\n\\]\
 n\nhttps://indico.itp.ac.cn/event/437/contributions/2818/
LOCATION:会议楼2 CXII102
URL:https://indico.itp.ac.cn/event/437/contributions/2818/
END:VEVENT
BEGIN:VEVENT
SUMMARY:DbarN meson-baryon scatter in Lattice QCD
DTSTART;VALUE=DATE-TIME:20261010T064000Z
DTEND;VALUE=DATE-TIME:20261010T065500Z
DTSTAMP;VALUE=DATE-TIME:20261005T011820Z
UID:indico-contribution-641-2833@indico.itp.ac.cn
DESCRIPTION:Speakers: 啸 常 (中国科学院近代物理研究所)\nThis
  project studies the low-energy $\\bar{D}N$ scattering in lattice QCD\, fo
 cusing on the S-wave channels $I(J^P)=0\\left(\\frac12^-\\right)\, 1\\left
 (\\frac12^-\\right)$.\n\nFinite-volume $\\bar{D}N$ correlation functions a
 re analyzed using the generalized eigenvalue problem (GEVP) to extract the
  two-body energy spectrum. The Lüscher formalism is then used to relate t
 he finite-volume energy levels to infinite-volume scattering amplitudes. N
 ear threshold\, the effective range expansion (ERE) is employed to extract
  low-energy scattering parameters\, including the scattering length and ef
 fective range. Possible effects from higher channel $\\bar{D}^*N$ \, is al
 so considered.\n\nThe overall aim is to obtain a first-principles understa
 nding of the low-energy $\\bar{D}N$ interaction and to clarify whether it 
 supports any near-threshold structures.\n\nhttps://indico.itp.ac.cn/event/
 437/contributions/2833/
LOCATION:会议楼2 CXII102
URL:https://indico.itp.ac.cn/event/437/contributions/2833/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$S$-wave scattering length of the $J/\\psi J/\\psi$ system from la
 ttice QCD in coordinate space
DTSTART;VALUE=DATE-TIME:20261010T065500Z
DTEND;VALUE=DATE-TIME:20261010T071000Z
DTSTAMP;VALUE=DATE-TIME:20261005T011820Z
UID:indico-contribution-641-2812@indico.itp.ac.cn
DESCRIPTION:Speakers: 嘉竣 谢 (School of Physical Sciences\, University
  of Chinese Academy of Sciences\, Beijing 100049\, China)\nThe $J/\\psi J/
 \\psi$ energy spectra are extracted from lattice QCD by utilzing the Coord
 inate-Space Two-Hadron Operators\, named as dumbbell method.  \n\nFinite-v
 olume energies indicate an attractive interaction in total spin $S=0$ chan
 nel and a repulsive interaction in total spin $S=1$ channel and total spin
  $S=2$ channel. \n\nThe scattering lengths of three different total spin a
 re also extracted from the lattice energy levels.\n\nhttps://indico.itp.ac
 .cn/event/437/contributions/2812/
LOCATION:会议楼2 CXII102
URL:https://indico.itp.ac.cn/event/437/contributions/2812/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non Perturbative Hamiltonian Framework for Finite Volume Energies 
 of N-body System
DTSTART;VALUE=DATE-TIME:20261010T062000Z
DTEND;VALUE=DATE-TIME:20261010T064000Z
DTSTAMP;VALUE=DATE-TIME:20261005T011820Z
UID:indico-contribution-641-2884@indico.itp.ac.cn
DESCRIPTION:Speakers: 康 余 ()\nhttps://indico.itp.ac.cn/event/437/contr
 ibutions/2884/
LOCATION:会议楼2 CXII102
URL:https://indico.itp.ac.cn/event/437/contributions/2884/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Baryon-Baryon Scattering in $N_f = 2+1$ Lattice QCD
DTSTART;VALUE=DATE-TIME:20261010T060000Z
DTEND;VALUE=DATE-TIME:20261010T062000Z
DTSTAMP;VALUE=DATE-TIME:20261005T011820Z
UID:indico-contribution-641-2824@indico.itp.ac.cn
DESCRIPTION:Speakers: 瀚洋 邢 (South China Normal University)\nWe prese
 nt a preliminary lattice QCD study of baryon-baryon scattering using $N_f 
 = 2+1$ CLQCD configurations. We focus primarily on the strangeness $S = -2
 $ $\\Lambda\\Lambda$ and $\\Xi N$ systems to explore the properties of $H$
 -dibaryon near threshold using the Lüscher finite-volume quantization con
 dition. Furthermore\, we extend our study to baryon-baryon systems involvi
 ng the $\\Omega$ baryon. We report recent progress on the interaction in t
 hese sectors and discuss the implications of different numerical extractio
 n techniques.\n\nhttps://indico.itp.ac.cn/event/437/contributions/2824/
LOCATION:会议楼2 CXII102
URL:https://indico.itp.ac.cn/event/437/contributions/2824/
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