Leading-order decuplet contributions to the baryon magnetic moments in Chiral Perturbation Theory

Details Leading-order decuplet contributions to the baryon magnetic moments in Chiral Perturbation Theory Leading-order decuplet contributions to the baryon magnetic moments in Chiral Perturbation Theory

2009-03-04

arxiv.org/abs/0903.0779v2

Phys.Lett.B676:63-68,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

Version published in Phys. Lett. B + typos corrected

Scientific paper

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.

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