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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
Source PublicationPHYSICS LETTERS B
KeywordProton Distributions Polarization Symmetry Spin
AbstractWe 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
Volume488Issue:40972Pages:254-260
Subject AreaPhysics
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/12909
Collection理论物理所科研产出_SCI论文
Corresponding AuthorMa, BQ , Peking Univ, Dept Phys, Beijing 100871, Peoples R China.
Recommended Citation
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,2000,488(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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