BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Precision determination of nucleon iso-vector scalar and tensor ch arges at the physical point DTSTART;VALUE=DATE-TIME:20261010T074000Z DTEND;VALUE=DATE-TIME:20261010T075500Z DTSTAMP;VALUE=DATE-TIME:20261005T020932Z UID:indico-contribution-642-2821@indico.itp.ac.cn DESCRIPTION:Speakers: 积昊 王 (Institute of Theoretical Physics，Chine se Academy of Sciences)\nWe report a high precision calculation of the iso spin vector charge $g_{S\,T}$ of the nucleon using recently proposed "blen ding" method which provides a high-precision stochastic estimate of the al l-to-all fermion propagator. A spin-$1/2$\, isospin-$1/2$ projected curre nt-involved basis element is utilized to reduce a particular nucleon-meson type excited state contamination whose coupling to the current operator i s enhanced by the lattice spatial volume. Using 16 $N_f=2+1$ lattice ensem bles which cover 5 lattice spacing\, 5 combinations with the same quark ma sses and lattice spacing but multiple volumes\, including three at the phy sical pion mass\, we report so far most precise lattice QCD prediction wit h the systematic uncertainties from continuum\, infinite volume\, chiral e xtrapolations\, excited state contamination and also renormalization.\n\nh ttps://indico.itp.ac.cn/event/437/contributions/2821/ LOCATION:会议楼2 CXII103 URL:https://indico.itp.ac.cn/event/437/contributions/2821/ END:VEVENT BEGIN:VEVENT SUMMARY:Complete Leading-twist Baryon Light-cone Distribution Amplitudes f rom LQCD DTSTART;VALUE=DATE-TIME:20261010T072500Z DTEND;VALUE=DATE-TIME:20261010T074000Z DTSTAMP;VALUE=DATE-TIME:20261005T020932Z UID:indico-contribution-642-2813@indico.itp.ac.cn DESCRIPTION:Speakers: 沐华 张 (Shanghai Jiao Tong University)\nBaryon l ight-cone distribution amplitudes (LCDAs) encode the longitudinal momentum distributions of valence quarks and provide important nonperturbative inp uts for hard exclusive processes involving baryons. In this talk\, I will present the first lattice determination of the three leading-twist $\\Lamb da$-baryon LCDAs\, $V$\, $A$\, and $T$\, as full two-dimensional functions of the valence-quark momentum fractions.\n\nThis work establishes a syste matic large-momentum effective theory (LaMET) framework for determining le ading-twist baryon LCDAs from lattice QCD\, covering the complete procedur e from equal-time three-quark correlators to the momentum-fraction depende nce of physical light-cone amplitudes. Key ingredients include a two-dimen sional hybrid renormalization prescription in coordinate space\, an HQET-m otivated large-$\\lambda$ extrapolation strategy for controlling the long- distance behavior of Euclidean correlators\, one-loop perturbative matchin g to the light-cone amplitudes in the $\\overline{\\rm MS}$ scheme\, and c ontrolled extrapolations to the continuum\, physical-pion-mass\, and infin ite-momentum limits.\n\nAs a phenomenological illustration\, replacing the asymptotic LCDA with the lattice-determined distributions leads to an $\\ mathcal{O}(10\\%)$ shift in the $\\Lambda$ electromagnetic form factor at perturbative scales. These results provide the first complete multidimensi onal\, $x$-dependent baryon LCDAs from first principles and establish a fr amework for future lattice studies of baryon light-cone structure.\n\nhttp s://indico.itp.ac.cn/event/437/contributions/2813/ LOCATION:会议楼2 CXII103 URL:https://indico.itp.ac.cn/event/437/contributions/2813/ END:VEVENT BEGIN:VEVENT SUMMARY:Enhanced Signal and Excited-State Control in Nonlocal Lattice Corr elators DTSTART;VALUE=DATE-TIME:20261010T071000Z DTEND;VALUE=DATE-TIME:20261010T072500Z DTSTAMP;VALUE=DATE-TIME:20261005T020932Z UID:indico-contribution-642-2885@indico.itp.ac.cn DESCRIPTION:Speakers: 诗怡 钟 ()\nhttps://indico.itp.ac.cn/event/437/co ntributions/2885/ LOCATION:会议楼2 CXII103 URL:https://indico.itp.ac.cn/event/437/contributions/2885/ END:VEVENT BEGIN:VEVENT SUMMARY:From Spin Structure to Transverse Momentum Distributions: A Lattic e View of the Nucleon DTSTART;VALUE=DATE-TIME:20261010T065500Z DTEND;VALUE=DATE-TIME:20261010T071000Z DTSTAMP;VALUE=DATE-TIME:20261005T020932Z UID:indico-contribution-642-2850@indico.itp.ac.cn DESCRIPTION:Speakers: 金鑫 谭 (Shanghai Jiao Tong University)\nUndersta nding how the spin\, flavor\, and intrinsic transverse motion of quarks em erge from QCD is essential for building a complete picture of nucleon stru cture. Recent developments in large-momentum effective theory have made it possible to access increasingly detailed partonic information directly fr om lattice QCD.\n\nIn this talk\, I will present two complementary lattice studies of nucleon structure. The first focuses on the spin-flavor struct ure encoded in ratios of helicity and unpolarized parton distribution func tions\, with particular emphasis on $\\Delta d(x)/d(x)$. This ratio direct ly probes the polarization of the down quark inside a longitudinally polar ized nucleon\, especially in the valence region\, while benefiting from pa rtial cancellation of common systematic uncertainties between the helicity and unpolarized distributions.\n\nThe second study extends this picture f rom longitudinal spin structure to the transverse-momentum structure of th e nucleon through calculations of isovector unpolarized and helicity TMD P DFs\, $f_1^{u-d}(x\,b_T)$ and $g_{1L}^{u-d}(x\,b_T)$. Using ensembles with multiple lattice spacings\, pion masses\, and nucleon momenta\, together with nonperturbative Collins–Soper evolution and LaMET matching\, we inv estigate their dependence on both the longitudinal momentum fraction $x$ a nd the transverse separation $b_T$\, as well as the associated systematic uncertainties.\n\nTogether\, these studies illustrate how lattice QCD can connect the spin structure of the nucleon with its transverse-momentum str ucture\, providing increasingly detailed first-principles information on n ucleon partonic dynamics and complementary input for phenomenology and fut ure Electron-Ion Collider measurements.\n\nhttps://indico.itp.ac.cn/event/ 437/contributions/2850/ LOCATION:会议楼2 CXII103 URL:https://indico.itp.ac.cn/event/437/contributions/2850/ END:VEVENT BEGIN:VEVENT SUMMARY:Neural-network extraction of collinear transversity distributions and tensor charges with distribution level lattice-QCD input DTSTART;VALUE=DATE-TIME:20261010T064000Z DTEND;VALUE=DATE-TIME:20261010T065500Z DTSTAMP;VALUE=DATE-TIME:20261005T020932Z UID:indico-contribution-642-2864@indico.itp.ac.cn DESCRIPTION:Speakers: 宏鑫 董 (Nanjing Normal University)\nWe present a neural-network global analysis of transversity parton distributions and d ihadron fragmentation functions using Belle\, HERMES\, COMPASS\, and STAR measurements. The main new ingredient is an x-dependent lattice-QCD determ ination of isovector transversity\, included directly at positive and nega tive x. It complements the limited experimental coverage and favors a larg er positive up-quark and a more negative down-quark transversity while ret aining an acceptable description of the world data.\n\nhttps://indico.itp. ac.cn/event/437/contributions/2864/ LOCATION:会议楼2 CXII103 URL:https://indico.itp.ac.cn/event/437/contributions/2864/ END:VEVENT BEGIN:VEVENT SUMMARY:Vector-meson light-cone distribution amplitude moments from lattic e QCD with gradient flow DTSTART;VALUE=DATE-TIME:20261010T062000Z DTEND;VALUE=DATE-TIME:20261010T064000Z DTSTAMP;VALUE=DATE-TIME:20261005T020932Z UID:indico-contribution-642-2848@indico.itp.ac.cn DESCRIPTION:Speakers: 彤巍 林 (University of Chinese Academy of Science s)\nWe present an ongoing lattice QCD study of vector-meson light-cone dis tribution amplitude moments using gradient flow on the 2+1+1 flavor HISQ g auge ensembles generated by the MILC Collaboration. As a first step\, we f ocus on the second moment of the φ-meson light-cone distribution amplitud e\, taking into account mixing among the relevant local operators. By comp aring results at different flow times\, we will investigate the flow-time dependence of the extracted moment. This talk will present the computation al setup\, analysis strategy\, and progress towards determining the second moment of the φ-meson light-cone distribution amplitude.\n\nhttps://indi co.itp.ac.cn/event/437/contributions/2848/ LOCATION:会议楼2 CXII103 URL:https://indico.itp.ac.cn/event/437/contributions/2848/ END:VEVENT BEGIN:VEVENT SUMMARY:Parton Distribution Functions from Large Momentum Expansion of Cur rent-Current Correlators DTSTART;VALUE=DATE-TIME:20261010T060000Z DTEND;VALUE=DATE-TIME:20261010T062000Z DTSTAMP;VALUE=DATE-TIME:20261005T020932Z UID:indico-contribution-642-2825@indico.itp.ac.cn DESCRIPTION:Speakers: 家璐 张 (Shanghai Jiao Tong University)\nThe univ ersality of the large momentum expansion allows computing parton distribut ion functions (PDFs) starting from any Euclidean correlator with appropria te large momentum Fourier\nComponents. Here we consider current-current co rrelators which have been used in short-distance\nexpansion to obtain mome nts of PDFs. The advantage of such correlators is that they have simple\nr enormalization properties and do not have linear power divergences as in q uasi-PDF. However\, in\nlattice calculations\, four-point functions are ne eded. Here we present an expansion formula with\ncurrent-current correlato rs up to the next-to-leading order\, and preliminary numerical calculation s\nwith four-point functions.\n\nhttps://indico.itp.ac.cn/event/437/contri butions/2825/ LOCATION:会议楼2 CXII103 URL:https://indico.itp.ac.cn/event/437/contributions/2825/ END:VEVENT END:VCALENDAR