期刊
PHYSICAL REVIEW D
卷 103, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.103.016003
关键词
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资金
- DOE [DE-SC0008791, DEAC05-06OR23177, DE-SC0019323]
- DFG [392578569]
- DOE, Office of Science, Office of Nuclear Physics in the Early Career Program
- DOE, Office of Science, Office of Nuclear Physics, within the framework of the TMD Topical Collaboration
- U.S. Department of Energy (DOE) [DE-SC0008791] Funding Source: U.S. Department of Energy (DOE)
The study reveals weak constraints from current lattice data on phenomenological PDFs for the unpolarized sector, but good agreement between experimental and lattice data for the polarized PDFs with significant constraints on spin-dependent isovector quark and antiquark distributions provided by the latter.
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.
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