Baryon magnetic moments and axial coupling constants with relativistic and exchange current effects

Abstract

The predictions for the axial coupling constants of the baryons are improved by the large relativistic corrections to the constituent quark current operators, while the predictions for the magnetic moments are worsened. The relativistic corrections to the baryon magnetic moments can be compensated for by the exchange current corrections that are associated with spin and flavor dependent quark-quark interactions with a form suggested by pseudoscalar meson exchange. This is shown by a calculation of the magnetic moments of the light and strange baryons within a phenomenological spin and flavor dependent interquark interaction model, which in combination with a linear confining interaction yields a spectrum that is close to the empirical one. We also consider the possibility that a part of the spin and flavor dependent interaction could be due to axial vector and vector exchange.