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Lambda, (Lambda)over-bar polarization and spin transfer in lepton deep-inelastic scattering
Ma BQ(马伯强); Ma, BQ; Schmidt, I; Soffer, J; Yang, JJ
2000
发表期刊EUROPEAN PHYSICAL JOURNAL C
卷号16期号:4页码:657-664
通讯作者Peking Univ, Dept Phys, Beijing 100871, Peoples R China ; CCAST, World Lab, Beijing 100080, Peoples R China ; Acad Sinica, Inst High Energy Phys, Beijing 100039, 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, Peoples R China
摘要The flavor and helicity distributions of the Lambda and <(Lambda)over bar> hyperons for both valence and sea quarks are calculated in a perturbative QCD (pQCD) based model. We relate these quark distributions to the fragmentation functions of Lambda and <(Lambda)over bar>, and calculate the z-dependence of the longitudinal spin transfer to Lambda and <(Lambda)over bar> in lepton deep-inelastic scattering (DIS). It is shown that the spin transfer to the Lambda is compatible with the first HERMES results at DESY, and further tests are suggested. We also make predictions for the z-dependence of the Lambda and <(Lambda)over bar> longitudinal polarizations in neutrino (antineutrino) DIS processes. We investigate the sea contribution to the fragmentation functions, and we testa possible scenario where the sea quarks in Lambda (or the sea antiquarks in <(Lambda)over bar>) are negatively polarized, whereas the sea antiquarks in the Lambda (or the sea quarks in <(Lambda)over bar>) are positively polarized. The asymmetry of the polarized fragmentation functions of the sea quarks and antiquarks to Lambda and <(Lambda)over bar> provides a way to understand the different behavior between the Lambda and <(Lambda)over bar> spin transfers observed in the recent E665 experiment at FNAL.
文章类型Article
学科领域Physics
研究领域[WOS]Physics
DOI10.1007/s100520000447
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语种英语
WOS类目Physics, Particles & Fields
WOS记录号WOS:000089910800007
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被引频次:38[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/238208
专题理论物理室
作者单位中国科学院高能物理研究所
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Ma BQ,Ma, BQ,Schmidt, I,et al. Lambda, (Lambda)over-bar polarization and spin transfer in lepton deep-inelastic scattering[J]. EUROPEAN PHYSICAL JOURNAL C,2000,16(4):657-664.
APA 马伯强,Ma, BQ,Schmidt, I,Soffer, J,&Yang, JJ.(2000).Lambda, (Lambda)over-bar polarization and spin transfer in lepton deep-inelastic scattering.EUROPEAN PHYSICAL JOURNAL C,16(4),657-664.
MLA 马伯强,et al."Lambda, (Lambda)over-bar polarization and spin transfer in lepton deep-inelastic scattering".EUROPEAN PHYSICAL JOURNAL C 16.4(2000):657-664.
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