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BEGIN:VEVENT
SUMMARY:BESIII上粲介子纯轻和半轻衰变
DTSTART;VALUE=DATE-TIME:20261010T100500Z
DTEND;VALUE=DATE-TIME:20261010T102000Z
DTSTAMP;VALUE=DATE-TIME:20261005T025848Z
UID:indico-contribution-644-2855@indico.itp.ac.cn
DESCRIPTION:Speakers: 溢嘉 曾 (IHEP)\nBESIII实验于2011至2024年间
 ，采集了世界上最大的近阈粲介子对样本，这些量子关
 联产生的粲介子对为精确测量粲介子含轻衰变提供了独
 特平台。基于该数据样本，BESIII精确测定了粲介子纯轻
 衰变的衰变常数，粲介子半轻衰变到（赝）标量，（轴
 ）矢量，张量介子的强相互作用形状因子，并抽取了CKM
 矩阵元$|V_{cs}|$以及$|V_{cd}|$。\n\nhttps://indico.itp.ac.cn/event/4
 37/contributions/2855/
LOCATION:会议楼2 CXII103
URL:https://indico.itp.ac.cn/event/437/contributions/2855/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hyperons Gluon Helicity from Lattice QCD
DTSTART;VALUE=DATE-TIME:20261010T095000Z
DTEND;VALUE=DATE-TIME:20261010T100500Z
DTSTAMP;VALUE=DATE-TIME:20261005T025848Z
UID:indico-contribution-644-2859@indico.itp.ac.cn
DESCRIPTION:Speakers: 昕然 刘 (Nanjing Normal University)\nWe present t
 he first lattice QCD calculation of the total gluon helicity contribution 
 $\\Delta G_H$ to the spin of $\\Lambda$\, $\\Sigma$\, and $\\Xi$ hyperons.
 \nThe calculation employs the Coulomb-gauge fixed topological current $K^\
 \mu$\, whose forward matrix element in the infinite momentum frame yields 
 $\\Delta G_H$ without non-trivial perturbative matching.\nUsing a single $
 N_f=2+1$ flavor dynamical ensemble with lattice spacing $a\\approx 0.105\\
  \\mathrm{fm}$ and pion mass $m_\\pi\\approx 292\\ \\mathrm{MeV}$\, we ext
 ract the bare matrix elements via the Feynman-Hellmann method\, with disti
 llation and momentum smearing to control excited-state contamination.\nThe
  bare matrix elements are non-perturbatively renormalized in the RI/MOM sc
 heme and subsequently converted to the $\\overline{\\mathrm{MS}}$ scheme\;
  the renormalization factor $\\bar{Z}_{11}^{\\mathrm{lat}}$ is employed\, 
 whose state-independence is guaranteed by the intrinsic nature of operator
  ultraviolet divergences.\nAfter infinite-momentum extrapolation and renor
 malization\, we obtain\n$\\Delta G_{\\Lambda} = 0.165(19)_{\\rm stat}(19)_
 {\\rm ren}$\,\n$\\Delta G_{\\Xi} = 0.160(14)_{\\rm stat}(19)_{\\rm ren}$\,
  and\n$\\Delta G_{\\Sigma} = 0.232(24)_{\\rm stat}(28)_{\\rm ren}$\nat the
  $\\overline{\\mathrm{MS}}$ scale $\\mu^2 = 10\\ \\mathrm{GeV}^2$\, corres
 ponding to approximately\n$37(5)_{\\rm stat}(4)_{\\rm ren}\\%$\,\n$33(3)_{
 \\rm stat}(4)_{\\rm ren}\\%$\, and\n$48(5)_{\\rm stat}(6)_{\\rm ren}\\%$ o
 f the hyperon total spin\, respectively.\nThe temporal and spatial compone
 nts of $K^\\mu$ yield consistent results\, confirming Lorentz covariance o
 f the approach beyond the nucleon sector.\nThese first-principles results 
 reveal the impact of flavor-symmetry breaking on gluon polarization across
  the baryon octet.\n\nhttps://indico.itp.ac.cn/event/437/contributions/285
 9/
LOCATION:会议楼2 CXII103
URL:https://indico.itp.ac.cn/event/437/contributions/2859/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Continuum-Limit Heavy-Meson LCDAs from Lattice QCD
DTSTART;VALUE=DATE-TIME:20261010T093500Z
DTEND;VALUE=DATE-TIME:20261010T095000Z
DTSTAMP;VALUE=DATE-TIME:20261005T025848Z
UID:indico-contribution-644-2854@indico.itp.ac.cn
DESCRIPTION:Speakers: 浩飞 高 (SJTU)\nHeavy-meson light-cone distributi
 on amplitudes are essential nonperturbative inputs for precision heavy-fla
 vor phenomenology. We present a first-principles lattice-QCD determination
  of heavy-meson LCDAs in both QCD and HQET using the HQLaMET framework. Si
 mulations on multiple ensembles enable controlled continuum\, chiral\, and
  infinite-momentum extrapolations. Improved lattice techniques significant
 ly enhance the quality of nonlocal correlators. For the HQET LCDA\, we com
 bine the nonperturbative peak region with the perturbative tail and determ
 ine key inverse moments\, obtaining (\\lambda_B = 0.340(20)) GeV at (\\mu 
 = 1) GeV.\n\nhttps://indico.itp.ac.cn/event/437/contributions/2854/
LOCATION:会议楼2 CXII103
URL:https://indico.itp.ac.cn/event/437/contributions/2854/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Collins-Soper Kernel and Intrinsic Soft Funtion
DTSTART;VALUE=DATE-TIME:20261010T092000Z
DTEND;VALUE=DATE-TIME:20261010T093500Z
DTSTAMP;VALUE=DATE-TIME:20261005T025848Z
UID:indico-contribution-644-2831@indico.itp.ac.cn
DESCRIPTION:Speakers: 智超 龚 ()\n横动量依赖分布（TMD）相关
 量，例如横动量依赖部分子分布函数（TMDPDF），能够为
 研究强子的三维结构提供关键信息，同时也是半包容深
 度非弹性散射（SIDIS）和 Drell–Yan 过程等高能散射过程
 中的重要非微扰输入。与共线部分子分布函数（PDF）不
 同，TMD 中包含近光锥 Wilson 线，因此会由于软动力学与
 共线动力学之间的分离而产生快度发散。为了消除这些
 发散，需要对软贡献进行适当的减除，而 TMD 对快度标度
 的依赖则由 Collins–Soper 核控制。此外，内禀软函数（int
 rinsic soft function）刻画了与快度无关的长程软胶子贡献，
 对于完整描述 TMD 因子化中的非微扰效应至关重要。\n\n
 在本次报告中，我将首先介绍 Collins–Soper 核和内禀软函
 数在 TMD 物理中的理论作用。随后，我将讨论如何在大动
 量有效理论（LaMET）框架下利用格点 QCD 提取这些物理量
 。最后，我将介绍我们近期在这一研究方向上的拓展，
 包括改进的格点计算、次领阶（NLO）匹配、对连续极限
 和物理 pion 质量极限的可控外推，以及在横向间距达到
 约 1fm 范围内对内禀软函数的确定。\n\nhttps://indico.itp.ac.c
 n/event/437/contributions/2831/
LOCATION:会议楼2 CXII103
URL:https://indico.itp.ac.cn/event/437/contributions/2831/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gluon Helicity Distribution of the Nucleon from Lattice QCD in Con
 tinuum Limit
DTSTART;VALUE=DATE-TIME:20261010T090500Z
DTEND;VALUE=DATE-TIME:20261010T092000Z
DTSTAMP;VALUE=DATE-TIME:20261005T025848Z
UID:indico-contribution-644-2810@indico.itp.ac.cn
DESCRIPTION:Speakers: 诗怡 钟 (CUHK(SZ))\nWe report a state-of-the-art 
 lattice QCD calculation of the gluon helicity parton distribution function
  of the proton within the large-momentum effective theory framework. The c
 alculation employs 2+1-flavor CLQCD gauge ensembles at three lattice spaci
 ngs $a=\\{0.105\, 0.0897\, 0.0775\\}$ fm and pion mass of approximately $3
 00$ MeV/$c^2$\, with nucleon momenta up to $3.0$ GeV/$c$. Distillation wit
 h momentum smearing is applied to improve the signal of two-point gluon-fi
 eld correlation functions. We renormalize the results in the hybrid scheme
 \, applying self-renormalization to purely imaginary and antisymmetric mat
 rix elements.\nAfter one-loop perturbative matching\, the gluon helicity d
 istribution\nis extrapolated to the continuum and infinite-momentum limits
 . The final result is consistent with global fitting within errors.\n\nhtt
 ps://indico.itp.ac.cn/event/437/contributions/2810/
LOCATION:会议楼2 CXII103
URL:https://indico.itp.ac.cn/event/437/contributions/2810/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Unpolarized Gluon PDF from Lattice QCD
DTSTART;VALUE=DATE-TIME:20261010T084500Z
DTEND;VALUE=DATE-TIME:20261010T090500Z
DTSTAMP;VALUE=DATE-TIME:20261005T025848Z
UID:indico-contribution-644-2861@indico.itp.ac.cn
DESCRIPTION:Speakers: 春华 曾 ()\nWe report a state-of-the-art lattice 
 QCD calculation of the nucleon unpolarized gluon parton dis-\ntribution fu
 nction employing large-momentum effective theory. The calculation is carri
 ed out on the\n2+1 flavor CLQCD ensembles with five lattice spacings a = {
 0.105\, 0.0897\, 0.0775\, 0.0688\, 0.0519}\nfm and various pion masses ran
 ging from 136 MeV to 317 MeV\, covering nulceon momenta up to 3\nGeV. Dist
 illation technique is applied to improve the signal of two-point correlato
 rs. We then apply\nthe state-of-the-art hybrid renormalization and one-loo
 p perturbative matching\, and extrapolate\nthe result to the continuum lim
 it\, infinite momentum limit and physical pion mass.\n\nhttps://indico.itp
 .ac.cn/event/437/contributions/2861/
LOCATION:会议楼2 CXII103
URL:https://indico.itp.ac.cn/event/437/contributions/2861/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Control of Excited-State Contamination in Nucleon Matrix Elements 
 Using All-to-All Fermion Propagators
DTSTART;VALUE=DATE-TIME:20261010T082500Z
DTEND;VALUE=DATE-TIME:20261010T084500Z
DTSTAMP;VALUE=DATE-TIME:20261005T025848Z
UID:indico-contribution-644-2858@indico.itp.ac.cn
DESCRIPTION:Speakers: 志成 胡 (ITP)\nWe present a method to decompose a
 nd control excited-state contamination in nucleon matrix elements using al
 l-to-all fermion propagators. By constructing a variational basis of nucle
 on and nucleon–meson interpolating operators\, we resolve the contributi
 ons of the nucleon ground state and low-lying multi-hadron states. In part
 icular\, we investigate excited states containing ($N\\pi$)\, ($N\\pi\\pi$
 )\, and meson-related scattering components such as ($Nf_1$). The generali
 zed eigenvalue problem is applied to the two-point correlation matrix to d
 etermine optimized operators\, which are then used to rotate the three-poi
 nt functions and reduce transitions involving excited states. This framewo
 rk allows the excited-state contributions to be studied separately instead
  of being absorbed into an uncontrolled systematic uncertainty. We focus o
 n the scalar and axial charges\, ($g_S$)\, ($g_A$)\, for which excited-sta
 te effects can have different magnitudes and time dependence. The method p
 rovides a systematic approach to improving the reliability of nucleon stru
 cture calculations and to quantifying the residual excited-state contamina
 tion.\n\nhttps://indico.itp.ac.cn/event/437/contributions/2858/
LOCATION:会议楼2 CXII103
URL:https://indico.itp.ac.cn/event/437/contributions/2858/
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