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Ma, BQ; Schmidt, I; Soffer, J; Yang, JJ; Ma, BQ , Peking Univ, Dept Phys, Beijing 100871, Peoples R China.
The quark-antiquark asymmetry of the nucleon sea from Lambda and (Lambda)over-bar fragmentation
发表期刊PHYSICS LETTERS B
关键词Parton Distributions Proton Polarization Symmetry Spin
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.
2000
ISSN0370-2693
卷号489期号:40972页码:293-299
学科领域Physics
收录类别SCI
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/12901
专题理论物理所科研产出_SCI论文
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,2000,489(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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