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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:20261005T053034Z
UID:indico-contribution-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/
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