Confronting lattice parton distributions with global QCD analysis

被引：43

作者：

Bringewatt, J. ^{[1
]}

Sato, N. ^{[2
]}

Melnitchouk, W. ^{[2
]}

Qiu, Jian-Wei ^{[2
]}

Steffens, F. ^{[3
]}

Constantinou, M. ^{[4
]}

机构：

[1] Univ Maryland, Dept Phys, College Pk, MD 20742 USA

[2] Jefferson Lab, Newport News, VA 23606 USA

[3] Univ Bonn, Inst Strahlen & Kernphys, D-53115 Bonn, Germany

[4] Temple Univ, Dept Phys, Philadelphia, PA 19122 USA

来源：

PHYSICAL REVIEW D | 2021年 / 103卷 / 01期

关键词：

DEUTERON STRUCTURE FUNCTIONS; HIGH STATISTICS MEASUREMENT; DEEP-INELASTIC-SCATTERING; STRUCTURE FUNCTIONS G(2); SPIN STRUCTURE; MUON SCATTERING; POLARIZED HE-3; PROTON; G(1)(P); ASYMMETRY;

D O I：

10.1103/PhysRevD.103.016003

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页数：11

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