Baryon magnetic moments in chiral perturbation theory

Details Baryon magnetic moments in chiral perturbation theory Baryon magnetic moments in chiral perturbation theory

1997-01-10

arxiv.org/abs/hep-ph/9701260v2

Nucl.Phys. B499 (1997) 349-367

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pp, LaTeX file, 2 figures (uses epsf), corrected version

Scientific paper

10.1016/S0550-3213(97)00313-1

We consider the chiral expansion of the octet baryon magnetic moments in heavy baryon chiral perturbation theory including all terms which are of order $q^4$. These terms are formally of quadratic order in the quark masses. We show that despite the large non-analytic quark mass corrections to the Coleman-Glashow relations at order $q^3$, including all analytic and non-analytic corrections at order $q^4$, which in total are of moderate size, allows for a fit to the measured magnetic moments due to the appearance of counter terms with free coupling constants of natural size. In this scheme, the $\Lambda \Sigma^0$ transition moment is predicted to be $\mu_{\Lambda \Sigma^0} = (1.42 \pm 0.01) \mu_N$.

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