The quark-antiquark asymmetry of the nucleon sea from Lambda and (Lambda)over-bar fragmentation
文献类型：期刊论文
| 作者 | Ma, BQ; Schmidt, I; Soffer, J; Yang, JJ; Ma, BQ , Peking Univ, Dept Phys, Beijing 100871, Peoples R China. |
| 刊名 | PHYSICS LETTERS B
 |
| 出版日期 | 2000 |
| 卷号 | 489期号:40972页码:293-299 |
| 关键词 | Parton Distributions Proton Polarization Symmetry Spin |
| ISSN号 | 0370-2693 |
| 英文摘要 | We present a general analysis of the spin transfer for Lambda and <(Lambda)over bar> production in deep-inelastic scattering of polarized charged leptons on the nucleon, and find that the pattern of different behaviors of Lambda and <(Lambda)over bar> production observed by the E665 Collaboration suggests the possibility of quark-antiquark asymmetries either in the quark to Lambda fragmentation functions and/or in the quark and antiquark distributions of the target proton. We also point out that the strange-antistrange asymmetry of the nucleon sea may produce an observable contribution to the different behaviors of Lambda and <(Lambda)over bar> production. We find that a softer (s) over bar(x) than s(x) as predicted by the light-cone baryon-meson fluctuation model of intrinsic quark-antiquark pairs of the nucleon sea might lead to a reasonable picture. However, the magnitude is still too small to explain the E665 data and the conclusion has also strong model-dependence. This may suggest the importance of quark-antiquark asymmetry in the quark to Lambda fragmentation functions, provided that the E665 data are confirmed. (C) 2000 Elsevier Science B.V. All rights reserved. |
| 学科主题 | Physics |
| URL标识 | 查看原文 |
| 公开日期 | 2012-08-29 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/12901]  |
| 专题 | 理论物理研究所_理论物理所1978-2010年知识产出 |
| 通讯作者 | Ma, BQ , Peking Univ, Dept Phys, Beijing 100871, Peoples R China. |
| 推荐引用方式 GB/T 7714 | Ma, BQ,Schmidt, I,Soffer, J,et al. The quark-antiquark asymmetry of the nucleon sea from Lambda and (Lambda)over-bar fragmentation[J]. PHYSICS LETTERS B,2000,489(40972):293-299. |
| APA | Ma, BQ,Schmidt, I,Soffer, J,Yang, JJ,&Ma, BQ , Peking Univ, Dept Phys, Beijing 100871, Peoples R China..(2000).The quark-antiquark asymmetry of the nucleon sea from Lambda and (Lambda)over-bar fragmentation.PHYSICS LETTERS B,489(40972),293-299. |
| MLA | Ma, BQ,et al."The quark-antiquark asymmetry of the nucleon sea from Lambda and (Lambda)over-bar fragmentation".PHYSICS LETTERS B 489.40972(2000):293-299. |
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来源：理论物理研究所
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