Perspective on polarised parton distribution functions and proton spin

被引：12

作者：

Cheng, P. ^{[1
,2
]}

Yu, Y. ^{[1
,2
]}

Xing, H. -Y. ^{[1
,2
]}

Chen, C. ^{[3
,4
]}

Cui, Z. -F. ^{[1
,2
]}

Roberts, C. D. ^{[1
,2
]}

机构：

[1] Nanjing Univ, Sch Phys, Nanjing 210093, Jiangsu, Peoples R China

[2] Nanjing Univ, Inst Nonperturbat Phys, Nanjing 210093, Jiangsu, Peoples R China

[3] Univ Sci & Technol China, Interdisciplinary Ctr Theoret Study, Hefei 230026, Anhui, Peoples R China

[4] Peng Huanwu Ctr Fundamental Theory, Hefei 230026, Anhui, Peoples R China

来源：

PHYSICS LETTERS B | 2023年 / 844卷

基金：

中国国家自然科学基金;

关键词：

Proton structure; High-energy polarised proton-proton; collisions; Polarised deep inelastic scattering; Emergence of mass; Continuum Schwinger function methods; Dyson-Schwinger equations; STRUCTURE FUNCTIONS G(1)(P); DEEP-INELASTIC-SCATTERING; MUON-PROTON; NUCLEON; QUARK; QCD; Q(2)-DEPENDENCE; AMPLITUDES; DEPENDENCE; ASYMMETRY;

D O I：

10.1016/j.physletb.2023.138074

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Supposing there exists an effective charge which defines an evolution scheme for both unpolarised and polarised parton distribution functions (DFs) that is all-orders exact and using Ansatze for hadron-scale proton polarised valence quark DFs, constrained by flavour-separated axial charges and insights from perturbative quantum chromodynamics, predictions are delivered for all proton polarised DFs at the scale & zeta;C2= 3 GeV2. The pointwise behaviour of the predicted DFs and, consequently, their moments, compare favourably with results inferred from data. Notably, flavour-separated singlet polarised DFs are small. On the other hand, the polarised gluon DF, ⠃G(x; & zeta;C), is large and positive. Using our result, we predict f10.05 dx ⠃G(x; & zeta;C) = 0.214(4) and that experimental measurements of the proton flavour-singlet axial charge should return aE0(& zeta;C) = 0.33(2).& COPY; 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons .org /licenses /by /4 .0/). Funded by SCOAP3.

引用

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