Baryon Magnetic Moments in Alternate 1/N_c Expansions

Abstract

Recent work shows not only the necessity of a 1/N_c expansion to explain the observed mass spectrum of the lightest baryons, but also that at least two distinct large N_c expansions, in which quarks transform under either the color fundamental or the two-index antisymmetric representation of SU(N_c), work comparably well. Here we show that the baryon magnetic moments do not support this ambivalence; they strongly prefer the color-fundamental 1/N_c expansion, providing experimental evidence that nature decisively distinguishes among 1/N_c expansions for this observable.

arXiv comment18 pages, ReVTeX

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• Orbifold equivalence for finite density QCD and effective field theory
• A covariant model for the decuplet to octet Dalitz decays
• Alternate 1/N_c Expansions and SU(3) Breaking from Baryon Lattice Results
• Meson cloud contributions to the Dalitz decays of decuplet to octet baryons
• Effect of the Casimir energy on the bag model phenomenology of light hadrons