Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-05-09
Phys.Rev.Lett.101:222002,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, 2 figures, accepted for publication in PRL
Scientific paper
10.1103/PhysRevLett.101.222002
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.
Alvarez-Ruso Luis
Camalich Martin J.
Geng Li Sheng
Vicente Vacas M. J.
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