Color Magnetic Corrections to Quark Model Valence Distributions

Abstract

We calculate order ${\alpha }_s$ 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 ${\alpha }_s$ sufficient to produce the $N-\Delta$ mass splitting, we find up and down quark distributions in reasonable agreement with experiment.

25 Pages, LA-UR-93-1320

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