Confronting lattice parton distributions with global QCD analysis

Conference · Thu Apr 01 00:00:00 EDT 2021

DOI:https://doi.org/10.2172/1973080· OSTI ID:1973080

Sato, Nobuo ^[1]; Melnitchouk, Wolodymyr ^[1]; Steffens, Fernanda ^[2]; Qiu, Jianwei ^[1]; Constantinou, Martha ^[3]; Bringewatt, Jacob ^[4]

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1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
2. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
3. Temple Univ., Philadelphia, PA (United States)
4. University of Maryland

We present the first Monte Carlo based global QCD analysis of spin-averaged and spin-dependent parton distribution functions (PDFs) that includes nucleon isovector matrix elements in coordinate space from lattice QCD. We investigate the degree of universality of the extracted PDFs when the lattice and experimental data are treated under the same conditions within the Bayesian likelihood analysis. For the unpolarized sector, we find rather weak constraints from the current lattice data on the phenomenological PDFs, and difficulties in describing the lattice matrix elements at large spatial distances. In contrast, for the polarized PDFs we find good agreement between experiment and lattice data, with the latter providing significant constraints on the spin-dependent isovector quark and antiquark distributions.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1973080
• Report Number(s): JLAB-THY-21-3606; DOE/OR/23177-6155
• Resource Relation: Conference: DIS 2021, XXVIII International Workshop on Deep-Inelastic Scattering and Related Subjects, Apr 12 – 16, 2021, Stony Brook, NY
• Country of Publication: United States
• Language: English