Color Magnetic Corrections to Quark Model Valence Distributions

Abstract

We calculate order $α_s$ color magnetic corrections to the valence quark distributions of the proton using the Los Alamos Model Potential wavefunctions. The spin-spin interaction breaks the model SU(4) symmetry, providing a natural mechanism for the difference between the up and down distributions. For a value of $α_s$ sufficient to produce the $N-Δ$ mass splitting, we find up and down quark distributions in reasonable agreement with experiment.

25 Pages, LA-UR-93-1320