SU(3)-breaking corrections to the baryon-octet magnetic moments in chiral perturbation theory

Abstract

We report a calculation of the baryon magnetic moments using covariant chiral perturbation theory within the extended-on-mass-shell renormalization scheme including intermediate octet and decuplet contributions. By fitting the two available low-energy constants, we improve the Coleman-Glashow description of the data when we include the leading SU(3) breaking effects coming from the lowest-order loops. We compare with previous attempts at the same order using heavy-baryon and covariant infrared chiral perturbation theory, and discuss the source of the differences.

Comments: 7 pag. Contribution to the proceedings of the International Workshop on Effective Field Theories: from the pion to the upsilon. Feb. 2009. Valencia, Spain