Masses, Magnetic Moments, and Semileptonic Decays of Spin 1/2 Baryons with Sea Contribution

The spin 1/2 baryons are pictured as a composite system made out of a “core” of three valence quarks (as in the simple quark model) surrounded by a “sea” (of gluon and $q\bar{q}$ pairs) which is specified by its total quantum numbers. We assume the sea is a SU(3) flavor octet with spin 0 or 1 but no color. This model, considered earlier, is used to obtain simultaneous fits for masses, magnetic moments and $G_A\mathrm{/}{G}_V$ for semileptonic decays. These fits give predictions for nucleon spin distributions in reasonable agreement with experiment.