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The quark-antiquark asymmetry of the nucleon sea
Brodsky, SJ; Ma BQ(马伯强); Ma, BQ
1996
发表期刊PHYSICS LETTERS B
卷号381期号:1-3页码:317-324
通讯作者CHINA CTR ADV SCI & TECHNOL,WORLD LAB,BEIJING 100080,PEOPLES R CHINA ; ACAD SINICA,INST HIGH ENERGY PHYS,BEIJING 100039,PEOPLES R CHINA ; KWANGHUA ACAD SCI,FAC NAT SCI,BEIJING 100081,PEOPLES R CHINA
文章类型Article
摘要Although the distributions of sea quarks and antiquarks generated by leading-twist QCD evolution through gluon splitting g --> (q) over bar q are necessarily CP symmetric, the distributions of nonvalence quarks and antiquarks which are intrinsic to the nucleon's bound state wavefunction need not be identical. In this paper we investigate the sea quark-antiquark asymmetries in the nucleon wavefunction which are generated by a light-cone model of energetically-favored meson-baryon fluctuations. The model predicts striking quark-antiquark asymmetries in the momentum and helicity distributions for the down and strange contributions to the proton structure function: the intrinsic d and s quarks in the proton sea are predicted to be negatively polarized, whereas the intrinsic (d) over bar and (s) over bar antiquarks give zero contributions to the proton spin, Such a picture is supported by experimental phenomena related to the proton spin problem and the violation of the Ellis-Jaffe sum rule. The light-cone meson-baryon fluctuation model also suggests a structured momentum distribution asymmetry for strange quarks and antiquarks which could be relevant to an outstanding conflict between two different determinations of the strange quark sea in the nucleon. The model predicts an excess of intrinsic d (d) over bar pairs over u (u) over bar pairs, as supported by the Gottfried sum rule violation. We also predict that the intrinsic charm and anticharm helicity and momentum distributions are not identical.
学科领域Physics
研究领域[WOS]Physics ; Physics
DOI10.1016/0370-2693(96)00597-7
URL查看原文
语种英语
研究领域[WOS]Physics ; Physics
WOS类目Physics, Multidisciplinary
WOS记录号WOS:A1996UY50000047
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被引频次:220[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/236942
专题理论物理室
作者单位中国科学院高能物理研究所
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GB/T 7714
Brodsky, SJ,Ma BQ,Ma, BQ. The quark-antiquark asymmetry of the nucleon sea[J]. PHYSICS LETTERS B,1996,381(1-3):317-324.
APA Brodsky, SJ,马伯强,&Ma, BQ.(1996).The quark-antiquark asymmetry of the nucleon sea.PHYSICS LETTERS B,381(1-3),317-324.
MLA Brodsky, SJ,et al."The quark-antiquark asymmetry of the nucleon sea".PHYSICS LETTERS B 381.1-3(1996):317-324.
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