XIIth Meeting on Lattice Parton Physics from Large Momentum Effective Theory (LaMET 2025)

Session

Session V

Oct 9, 2025, 11:00 AM

CFNS, Peter Paul Seminar Room, C 120 Physics Building (Stony Brook University/Online)

16. First-Principle Calculation of Collins-Soper Kernel from Quasi-Transverse-Momentum-Dependent Wave Functions

Jin-Xin Tan (Shanghai Jiao Tong University)

10/9/25, 11:00 AM

We present a lattice QCD calculation of the Collins-Soper kernel, which governs the rapidity evolution of transverse-momentum-dependent (TMD) distributions, using Large Momentum Effective Theory (LaMET). Quasi-TMD wave functions are computed with three meson momenta on CLQCD configurations (multiple lattice spacings and pion masses) employing clover quarks and varied hadronic states. HYP...

10. Nucleon PDFs from Boosted Correlations in the Coulomb Gauge

Jinchen He (University of Maryland, College Park)

10/9/25, 11:25 AM

Recently, a novel approach has been suggested to compute parton distributions through the use of boosted correlators fixed in the Coulomb gauge from lattice QCD, within the framework of Large-Momentum Effective Theory (LaMET). This approach circumvents the need for Wilson lines, potentially enhancing the efficiency and accuracy of lattice QCD calculations significantly. In this study, we...

7. Pion and Proton TMDPDFs from Coulomb-Gauge Quasi-TMDs

XIANG Gao

10/9/25, 11:50 AM

In this talk, we report our recent lattice QCD calculations of transverse-momentum-dependent parton distribution functions (TMDPDFs) for pion and proton using the Coulomb-gauge quasi-TMD framework. For the pion, we determine the valence-quark TMDPDF along with the intrinsic soft function and Collins–Soper kernel, showing consistency with perturbation theory at short transverse separations and...