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

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arxiv 0805.1419 v2 pith:K5J2FB73 submitted 2008-05-09 hep-ph

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

L. S. Geng , J. Martin Camalich , L. Alvarez-Ruso , M. J. Vicente Vacas This is my paper
classification hep-ph
keywords baryoncovariantbreakingchiralleadingmagneticmomentsperturbation
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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