Lambda, bar{Lambda} polarization and spin transfer in lepton deep-inelastic scattering |
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| Authors: | B.-Q. Ma I. Schmidt J. Soffer J.-J. Yang |
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| Affiliation: | (1) Department of Physics, Peking University, Beijing 100871, P.R. China, CN;(2) CCAST (World Laboratory), P.O. Box 8730, Beijing 100080, P.R. China, CN;(3) Institute of High Energy Physics, Academia Sinica, P.O. Box 918(4), Beijing 100039, P.R. China, CN;(4) Departamento de Física, Universidad Técnica Federico Santa María, Casilla 110-V, Valparaíso, Chile, CL;(5) Centre de Physique Théorique, CNRS, Luminy Case 907, 13288 Marseille Cedex 9, France, FR;(6) Department of Physics, Nanjing Normal University, Nanjing 210097, P.R. China, CN |
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| Abstract: | ![]()
The flavor and helicity distributions of the and 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 and , and calculate the z-dependence of the longitudinal spin transfer to and in lepton deep-inelastic scattering (DIS). It is shown that the spin transfer to the is compatible with the first HERMES results at DESY, and further tests are suggested. We also make predictions for the z-dependence of the and longitudinal polarizations in neutrino (antineutrino) DIS processes. We investigate the sea contribution to the fragmentation functions, and we test a possible scenario where the sea quarks in (or the sea antiquarks in ) are negatively polarized, whereas the sea antiquarks in the (or the sea quarks in ) are positively polarized. The asymmetry of the polarized fragmentation functions of the sea quarks and antiquarks to and provides a way to understand the different behavior between the and spin transfers observed in the recent E665 experiment at FNAL. Received: 5 April 2000 / Published online: 26 July 2000 |
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