Toward a precision calculation of generalized parton distribution functions

ORAL

Abstract

Understanding the three-dimensional internal structure of the nucleon is an important goal for nuclear physics. We present the latest lattice-QCD results on the unpolarized and helicity generalized parton distribution functions (GPDs) for the proton, calculated directly at the physical pion mass, using 2+1+1 flavors of highly improved staggered quarks (HISQ) in ensembles generated by MILC Collaboration. These GPDs are calculated using large-momentum effective theory (LaMET) method at skewnesses $xi=0$ and $xi = 0.25$ with multiple transfer momenta. We study and compare the effects of systematic errors by applying hybrid renormalization schemes with leading renormalon resummation and renormalization-group resummation improvement.

*This research used resources of the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231 through ERCAP; facilities of the USQCD Collaboration, which are funded by the Office of Science of the U.S. Department of Energy, and supported in part by Michigan State University through computational resources provided by the Institute for Cyber-Enabled Research (iCER).The work of HL is partly supported by the US National Science Foundation under grant PHY 1653405 ``CAREER: Constraining Parton Distribution Functions for New-Physics Searches'' and PHY 2209424, and by the Research Corporation for Science Advancement through the Cottrell Scholar Award.

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Presenters

  • Huey-Wen Lin

    • Michigan State University

Authors

  • Huey-Wen Lin

    • Michigan State University