2001/10/02 by Bo-Qiang Ma, Iván Schmidt, Ivan Schmidt +2
Physics and Astronomy · #Baryon #Deep inelastic scattering #Diquark #Hadron #High-Energy Particle Collisions Research #Inelastic scattering #Lambda #Lepton #Nuclear physics #Nucleon #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum mechanics #Quark #Quark model #Scattering #hep-ex #hep-ph #nucl-ex #nucl-th
paper · pdf · doi:10.1103/physrevd.65.034004
published as Phys.Rev. D65 (2002) 034004 · 29 latex pages, 16 figures, to appear in PRD
arxiv created 2001/10/02 · openalex publication_date 2002/01/09 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
SU(3) symmetry relations between the octet baryons are introduced in order to connect both the unpolarized and polarized quark distributions of the octet baryons with those of the nucleon. Two different parametrizations of the nucleon quark distributions are used. A new scenario of quark flavor and spin structure of the \ensuremathΛ is found and compared with two other models: a perturbative QCD based analysis and a quark diquark model. The u and d quarks inside the \ensuremathΛ are predicted to be positively polarized at a large Bjorken variable x in the new scenario. By using an approximate relation connecting the quark fragmentation functions with the quark distributions, the hadron polarizations of the octet baryons in e+e^\ensuremath- annihilation, polarized charged lepton deep-inelastic scattering (DIS) processes, and neutrino (antineutrino) DIS processes are predicted. The predictions for \ensuremathΛ polarizations in several processes are compatible with the available data at a large fragmentation momentum fraction z, and support the prediction of positively polarized u and d quarks inside the \ensuremathΛ at large x. Predictions for Drell-Yan processes from \ensuremathΣ^\ifmmode±\else\textpm\fi and \ensuremathΞ^\ensuremath- beams on an isoscalar target are also given and discussed.