Re-examining valence quark spin distributions
Abstract
The observed deep inelastic nucleon spin asymmetries A1p,n and the spin dependent quark distributions break SU(6) spin - flavour symmetry. In quark models two mechanisms for breaking SU(6) symmetry are well known: the hyperfine interaction and the pion cloud of the nucleon. I re-evaluate these mechanisms and show how the breaking of SU(6) in each case affects spin dependent valence quark distributions of the proton. In particular I investigate the properties of these mechanisms in the kinematic region 0.3 < x < 0.7 and attempt to test these against known data. Both mechanisms are able to explain the quantitative features of the spin asymmetries.
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