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

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arxiv 0903.0779 v2 pith:W6IP5VOT submitted 2009-03-04 hep-ph hep-latnucl-th

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

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