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The quark-antiquark asymmetry of the nucleon sea from Lambda and (Lambda)over-bar fragmentation
Ma, BQ; Schmidt, I; Soffer, J; Yang, JJ; Ma, BQ , Peking Univ, Dept Phys, Beijing 100871, Peoples R China.
2000
发表期刊PHYSICS LETTERS B
ISSN0370-2693
卷号488期号:40972页码:254-260
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.
部门归属Peking Univ, Dept Phys, Beijing 100871, Peoples R China; CCAST, World Lab, Beijing 100080, Peoples R China; Acad Sinica, Inst Theoret Phys, Beijing 100080, Peoples R China; Univ Tecn Federico Santa Maria, Dept Fis, Valparaiso, Chile; CNRS, Ctr Phys Theor, F-13288 Marseille 9, France; Nanjing Normal Univ, Dept Phys, Nanjing 210097, Peoples R China
关键词Proton Distributions Polarization Symmetry Spin
学科领域Physics
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收录类别SCI
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/12909
专题理论物理所1978-2010年知识产出
通讯作者Ma, BQ , Peking Univ, Dept Phys, Beijing 100871, Peoples R China.
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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,2000,488(40972):254-260.
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,488(40972),254-260.
MLA Ma, BQ,et al."The quark-antiquark asymmetry of the nucleon sea from Lambda and (Lambda)over-bar fragmentation".PHYSICS LETTERS B 488.40972(2000):254-260.
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