Nucleon spin structure at very high x

被引：59

作者：

Roberts, Craig D. ^{[1
]}

Holt, Roy J. ^{[1
]}

Schmidt, Sebastian M. ^{[2
,3
]}

机构：

[1] Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA

[2] Forschungszentrum Julich, Inst Adv Simulat, D-52425 Julich, Germany

[3] JARA, D-52425 Julich, Germany

来源：

PHYSICS LETTERS B | 2013年 / 727卷 / 1-3期

关键词：

Continuum strong QCD; Diquark correlations; Dynamical chiral symmetry breaking; Dyson-Schwinger equations; Nucleon longitudinal spin asymmetries; Parton distribution functions; Valence quarks at very high x; QUARK; DISTRIBUTIONS; SCATTERING; PROTON; PION;

D O I：

10.1016/j.physletb.2013.09.038

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Dyson-Schwinger equation treatments of the strong interaction show that the presence and importance of nonpointlike diquark correlations within the nucleon are a natural consequence of dynamical chiral symmetry breaking. Using this foundation, we deduce a collection of simple formulae, expressed in terms of diquark appearance and mixing probabilities, from which one may compute ratios of longitudinal-spin-dependent u- and d-quark parton distribution functions on the domain x similar or equal to 1. A comparison with predictions from other approaches plus a consideration of extant and planned experiments shows that the measurement of nucleon longitudinal spin asymmetries on x similar or equal to 1 can add considerably to our capacity for discriminating between contemporary pictures of nucleon structure. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：249 / 254

页数：6

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