Chiral perturbation theory analysis of the baryon magnetic moments revisited

Abstract

We reexamine critically the chiral expansion for the baryon magnetic moments including the contributions from loops which involve intermediate octet and decuplet baryons. We find that, contrary to some claims, the nonanalytic loop contributions of orders $m_s^{1/2}$ and $m_{s}ln{m}_s$ are of the same general size because of large coupling factors for the latter, and that the decuplet contributions are as large as the octet contributions and must be included in a consistent calculation. There is no clear evidence of the convergence of the chiral series. The adequacy of the theory will not be established until dynamical models are able to calculate the contributions from the counterterms that largely hide the loop effects in fits to the data.

11 pages, 2 figures, submitted to Phys. Rev. D. Three minor typos are corrected, the most important being an extra minus sign on the first term on the rhs of Eq. (5)

References in corpus (7)

• The 1/N Expansion for Baryons
• Chiral Perturbation Theory Analysis of the Baryon Magnetic Moments
• Strong and Electromagnetic Decays of the Baryon Decuplet
• Baryon magnetic moments in chiral perturbation theory
• Flavor Symmetry Breaking in the 1/N Expansion
• Baryon Magnetic Moments in a Simultaneous Expansion in $1/N$ and $m_s$
• Baryon Magnetic Moments in the 1/N Expansion

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