Baryon magnetic moments in chiral perturbation theory Original Research Article

We consider the chiral expansion of the octet baryon magnetic moments in heavy baryon chiral perturbation theory including all terms which are of order q4. These terms are formally of quadratic order in the quark masses. We show that despite the large non-analytic quark mass corrections to the Coleman-Glashow relations at order q3, including all analytic and non-analytic corrections at order q4, which in total are of moderate size, allows for a fit to the measured magnetic moments due to the appearance of counter terms with free coupling constants of natural size. In this scheme, the ΛΣ0 transition moment is predicted to be μΛΣ0 = (1.40 ± 0.01) μN.