Chiral perturbation theory analysis of the baryon magnetic moments reexamined

Journal Article · Wed Jul 01 04:00:00 EDT 1998 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.58.013010· OSTI ID:636207

Durand, L; Ha, P ^[1]

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1. Department of Physics, University of Wisconsin-Madison, 1150 University Avenue, Madison, Wisconsin 53706 (United States)

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{sub s}{sup 1/2} and m{sub s}lnm{sub 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. {copyright} {ital 1998} {ital The American Physical Society}

• OSTI ID: 636207
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 1 Vol. 58; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BARYON DECUPLETS
BARYONS
CHIRAL SYMMETRY
COUPLING
MAGNETIC MOMENTS
PERTURBATION THEORY