Spin content ofΛand its longitudinal polarization ine+e−annihilation at high energies

1998/03/03 by C. Boros, Zuo-tang Liang, Liang Zuo-tang · 6 citations
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph

paper · pdf · doi:10.1103/physrevd.57.4491

published as Phys.Rev.D57:4491-4494,1998 · 12 pages, 2 figures

arxiv created 1998/03/03 · openalex publication_date 1998/04/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/04

Abstract

Longitudinal polarization of \ensuremathΛ produced in e⁺e^\ensuremath- annihilation at CERN LEP energies is calculated in a picture for the spin content of \ensuremathΛ which is consistent with the polarized deep inelastic lepton-nucleon scattering data and SU(3) flavor symmetry for hyperon decay, so that the spin of \ensuremathΛ is not completely carried by its s-valence quark. A comparison with the recent ALEPH data and the results of earlier calculations based on the static quark model, in which the spin of \ensuremathΛ is completely determined by the s quark, is given. The result shows that further measurements of such polarization should provide useful information as to the question of which picture is more suitable in describing spin effects in the fragmentation processes.

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• Hyperon beta-decay and axial charges of the lambda in view of strongly distorted baryon wave-functions