Speaker
Description
The large-momentum effective theory (LaMET) is a systematic approach to calculate parton physics from Euclidean approaches such as lattice QCD. In this talk, I will present a state-of-the-art lattice QCD calculation of pion valence quark distribution with the hybrid scheme and the first-time implementation of next-to-next-to-leading order LaMET matching correction, which is done using two fine lattices with spacings $a$=0.04 fm and 0.06 fm and valence pion mass 300 MeV at boost momentum as large as 2.42 GeV. I will demonstrate that the renormalization and the perturbative matching in $x$ space yields a reliable determination of the valence quark distribution for moderate $x$ with controllable systematics, which shows reduced uncertainties compared to an analysis with the short-distance factorization approach, and is in nice agreement with the most recent global analyses.
| Submitted on behalf of a Collaboration? | No |
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