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.
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...
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...
