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