The quark-antiquark asymmetry of the nucleon sea
文献类型：期刊论文
| 作者 | Brodsky, SJ; Ma BQ(马伯强); Ma, BQ |
| 刊名 | PHYSICS LETTERS B
 |
| 出版日期 | 1996 |
| 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 |
| 英文摘要 | 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. |
| 学科主题 | Physics |
| 类目[WOS] | Physics, Multidisciplinary |
| 研究领域[WOS] | Physics |
| 原文出处 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:A1996UY50000047 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/236942]  |
| 专题 | 高能物理研究所_理论物理室 |
| 作者单位 | 中国科学院高能物理研究所 |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：高能物理研究所
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