BARYON MAGNETIC-MOMENTS AND AXIAL COUPLING-CONSTANTS WITH RELATIVISTIC AND EXCHANGE CURRENT EFFECTS

The large relativistic corrections to the constituent quark current op erators improve the predictions for the axial couplings of the baryons , but worsen those for their magnetic moments. The exchange current co rrections that are associated with flavor and spin dependent hyperfine interactions between the quarks with a form suggested by pseudoscalar meson exchange can compensate the relativistic corrections to the bar yon magnetic moments. This is demonstrated by a calculation of the mag netic moments of the non-strange and strange baryons using wave functi ons and exchange current operators, which correspond to a recent pheno menological spin and flavor dependent interquark interaction model wit h a linear confining interaction, which yields a spectrum close to the empirical one. The possibility that part of the flavor and spin depen dent interaction could be due to vector and axial-vector exchange is e xplored. (C) 1997 Elsevier Science B.V.