1995/05/15 by B. Ehrnsperger, Andreas Schäfer, A. Schäfer
Physics and Astronomy · #Black Holes and Theoretical Physics #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.52.2709
published as Phys.Rev. D52 (1995) 2709-2716 · 18 pages and 11 figures as uudecoded ps files
arxiv created 1995/05/15 · openalex publication_date 1995/09/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We present an update of a phenomenological model for the spin-dependent structure functions g1(x,Q2) of the proton and neutron. This model is based on a broken SU(6) wave function parametrized by the unpolarized structure functions. The two free parameters of the model are chosen to satisfy the Bjorken and Ellis-Jaffe sum rules. The model respects isospin symmetry and has zero strange sea polarization. Using new values for F/D from hyperon \ensuremathβ decay the resulting Q2-dependent asymmetries A1 are in perfect agreement with the existing data. Therefore we do not see any evidence for a ``spin crisis.'' With two choices for g2 the Q2 dependence of A1(x,Q2) and A2(x,Q2) \ensuremath\surdQ2/M is predicted and shown to be small for both cases.