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

Session

Session II

Oct 8, 2025, 11:00 AM

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

8. GUMP1.0 proton GPD analysis including lattice QCD input

Xiangdong Ji (U. Maryland)

10/8/25, 11:00 AM

I will present the first global proton GPD analysis by Y. Guo et al, with
lattice QCD input. I also comment on LaMET calculations of GPDs.

22. GPDs from Lattice QCD with Asymmetric Momentum Transfer: Unpolarized Quarks at Nonzero Skewness

Manuel Colaço (Adam Mickiewicz University)

10/8/25, 11:25 AM

This work presents a generalization of the asymmetric-frame approach to generalized parton distributions that explicitly includes longitudinal momentum transfer, enabling studies at nonzero skewness $\xi$. The method reorganizes nucleon matrix elements into Lorentz-invariant, frame-independent amplitudes -- an extension of our earlier $\xi=0$ work in unpolarized, helicity, and transversity...

2. Resummation for Lattice QCD Calculation of Generalized Parton Distributions at Nonzero Skewness

Rui Zhang (argonne national laboratory)

10/8/25, 11:50 AM

Large-momentum effective theory (LaMET) provides an approach to directly calculate the $x$-dependence of generalized parton distributions (GPDs) on a Euclidean lattice through power expansion and a perturbative matching. When a parton's momentum becomes soft, the corresponding logarithms
in the matching kernel become non-negligible at higher orders of perturbation theory, which requires a...