Leading-order decuplet contributions to the baryon magnetic moments in Chiral Perturbation Theory
arXiv:0903.0779 · doi:10.1016/j.physletb.2009.04.061
Abstract
We extend an earlier study of the baryon magnetic moments in chiral perturbation theory by the explicit inclusion of the spin-3/2 decuplet resonances. We find that the corrections induced by these heavier degrees of freedom are relatively small in a covariant framework where unphysical spin-1/2 modes are removed. Consequently, implementing the leading SU(3)-breaking corrections given by both the baryon and decuplet contributions, we obtain a description of the baryon-octet magnetic moments that is better than the Coleman-Glashow relations. Finally, we discuss the uncertainties and compare between heavy baryon and covariant approaches.
Version published in Phys. Lett. B + typos corrected