Leading SU(3)-breaking corrections to the baryon magnetic moments in Chiral Perturbation Theory

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Geng, L. S.
Camalich, J. Martin
Alvarez-Ruso, L.
Vacas, M. J. Vicente
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Abstract
Description
We calculate the baryon magnetic moments using covariant Chiral Perturbation Theory ($\chi$PT) within the Extended-on-mass-shell (EOMS) renormalization scheme. By fitting the two available low-energy constants (LECs), we improve the Coleman-Glashow description of the data when we include the leading SU(3) breaking effects coming from the lowest-order loops. This success is in dramatic contrast with previous attempts at the same order using Heavy Baryon (HB) $\chi$PT and covariant Infrared (IR) $\chi$PT. We also analyze the source of this improvement with particular attention on the comparison between the covariant results.
Comment: 4 pages, 2 figures, accepted for publication in PRL
Keywords
High Energy Physics - Phenomenology
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