1999/06/30 by K. Ackerstaff, The HERMES Collaboration, A. Airapetian +98 · 166 citations
Physics and Astronomy · #Decomposition #Deep inelastic scattering #Flavor #High-Energy Particle Collisions Research #Inelastic scattering #Nuclear physics #Nucleon #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Quark #Scattering #hep-ex
paper · pdf · doi:10.1016/s0370-2693(99)00964-8
published in Physics Letters B 464(1-2), 123-134 (Elsevier BV) · 14 pages, 6 figures (eps format), 10 tables in Latex New version contains tables of asymmetries and correlation matrix
openalex publication_date 1999/10/01 · arxiv created 2000/02/01 · arxiv updated 2009/11/30 · openalex created_date 2021/02/01 · openalex updated_date 2026/08/05
Spin asymmetries of semi-inclusive cross sections for the production of positively and negatively charged hadrons have been measured in deep-inelastic scattering of polarized positrons on polarized hydrogen and 3He targets, in the kinematic range 0.023<x<0.6 and 1 GeV2<Q2<10 GeV2. Polarized quark distributions are extracted as a function of x for up (u+ubar) and down (d+dbar) flavors. The up quark polarization is positive and the down quark polarization is negative in the measured range. The polarization of the sea is compatible with zero. The first moments of the polarized quark distributions are presented. The isospin non-singlet combination Deltaq3 is consistent with the prediction based on the Bjorken sum rule. The moments of the polarized quark distributions are compared to predictions based on SU(3)f flavor symmetry and to a prediction from lattice QCD.