Bjorken polarized sum rule and infrared-safe QCD couplings

被引：27

作者：

Ayala, Cesar ^{[1
]}

Cvetic, Gorazd ^{[1
]}

Kotikov, Anatoly V. ^{[2
]}

Shaikhatdenov, Binur G. ^{[2
]}

机构：

[1] UTFSM, Dept Phys, Casilla 110-V, Valparaiso, Chile

[2] Joint Inst Nucl Res, Dubna 141980, Russia

来源：

EUROPEAN PHYSICAL JOURNAL C | 2018年 / 78卷 / 12期

关键词：

ANALYTIC PERTURBATION-THEORY; STRUCTURE-FUNCTION G(1)(P); SMALL-X BEHAVIOR; SPIN STRUCTURE; LEADING ORDER; COMBINED H1; CCFR DATA; PARTON DISTRIBUTIONS; INELASTIC-SCATTERING; Q (2)-EVOLUTION;

D O I：

10.1140/epjc/s10052-018-6490-9

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：

Experimental data obtained for the polarized Bjorken sumrule (BSR) Gamma(p-n) 1 (Q2) are fitted by using predictions derived within a truncated operator product expansion (OPE) approach to QCD. Four QCD versions are considered: perturbative QCD (pQCD) in the MS scheme, Analytic Perturbation Theory (APT), and 2d and 3d analytic QCD versions. In contrast to pQCD, these QCD variants do not have Landau singularities at low positive Q2, which facilitates the fitting procedure significantly. The fitting procedure is applied first to the experimental data of the inelastic part of BSR, and the known elastic contributions are added after the fitting. In general, when 2d and 3d QCD coupling is used the fitted curves give the best results, within the Q2-range of the fit as well as in extended Q2-intervals. When the fitting procedure is applied to the total BSR, i. e., to the sum of the experimental data and the elastic contribution, the quality of the results deteriorates significantly.

引用

页数：25

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