Generalized parton distributions through universal moment parameterization: non-zero skewness case

被引：27

作者：

Guo, Yuxun ^{[1
,4
]}

Ji, Xiangdong ^{[1
]}

Santiago, M. Gabriel ^{[2
]}

Shiells, Kyle ^{[3
]}

Yang, Jinghong ^{[1
]}

机构：

[1] Univ Maryland, Maryland Ctr Fundamental Phys, Dept Phys, 4296 Stadium Dr, College Pk, MD 20742 USA

[2] SURA, Ctr Nucl Femtog, 1201 New York Ave NW, Washington, DC 20005 USA

[3] Univ Manitoba, Dept Phys & Astron, Allen Bldg, Winnipeg, MB R3T 2N2, Canada

[4] Lawrence Berkeley Natl Lab, Nucl Sci Div, Berkeley, CA 94720 USA

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2023年 / 2023卷 / 05期

关键词：

Parton Distributions; Properties of Hadrons; Specific QCD Phenomenology; VIRTUAL COMPTON-SCATTERING; FITTING PROCEDURE; ELECTROPRODUCTION;

D O I：

10.1007/JHEP05(2023)150

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We present the first global analysis of generalized parton distributions (GPDs) combing lattice quantum chromodynamics (QCD) calculations and experiment measurements including global parton distribution functions (PDFs), form factors (FFs) and deeply virtual Compton scattering (DVCS) measurements. Following the previous work where we parameterize GPDs in terms of their moments, we extend the framework to allow for the global analysis at non-zero skewness. Together with the constraints at zero skewness, we fit GPDs to global DVCS measurements from both the recent JLab and the earlier Hadron-Electron Ring Accelerator (HERA) experiments with two active quark flavors and leading order QCD evolution. With certain choices of empirical constraints, both sea and valence quark distributions are extracted with the combined inputs, and we present the quark distributions in the proton correspondingly. We also discuss how to extend the framework to accommodate more off-forward constraints beyond the small xi expansion, especially the lattice calculated GPDs.

引用

页数：25

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