WHY THE NAIVE QUARK-MODEL CAN YIELD A GOOD ACCOUNT OF THE BARYON MAGNETIC-MOMENTS

The chiral quark model suggests that the baryon quark sea is negativel y polarized. This modifies the spin structure as given by the naive qu ark model and agrees with experimental data. However, for the magnetic moments, there is significant cancellation between the contributions from this sea spin polarization and the orbital angular momentum so th at effectively the moments are given by the valence constituent quarks alone, as in the naive quark model.