Speaker
Description
Parton distribution functions (PDFs) are universal scaling functions essential for probing hadron structure as well as searching for New physics beyond the Standard Model (SM). The large momentum effective theory (LaMET) is a precision-controlled framework for directly calculating the x-dependence of PDFs, based on the first principles of Quantum Chromodynamics (QCD). In this talk, I introduce some of the efforts aimed at improving perturbative accuracy for the LaMET matching kernel, including DGLAP log resummation, threshold log resummation, and leading renormalon resummation. The main numerical effect is that the perturbative matching breaks down in the endpoint regions but remains reliable in the moderate x-range with controlled precision.
