BARYON MAGNETIC-MOMENTS IN CHIRAL PERTURBATION-THEORY

We consider the chiral expansion of the octet baryon magnetic moments in heavy baryon chiral perturbation theory including all terms which a re of order q(4). These terms are formally of quadratic order in the q uark masses. We show that despite the large non-analytic quark mass co rrections to the Coleman-Glashow relations at order q(3), including al l analytic and non-analytic corrections at order q(4), which in total are of moderate size, allows for a fit to the measured magnetic moment s due to the appearance of counter terms with free coupling constants of natural size, In this scheme, the Lambda Sigma 0 transition moment is predicted to be mu(Lambda Sigma)0 = (1.40 +/- 0.01) mu(N). (C) 1997 Elsevier Science B.V.