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The generalization of QCD to many colors is not unique; each distinct choicecorresponds to a distinct 1/N_c expansion. The familiar 't Hooft N_c -> \inftylimit places quarks in the fundamental representation of SU(N_c), while analternative approach places quarks in its two-index antisymmetricrepresentation. At N_c=3 these two 1/N_c expansions coincide. We compare theirpredictions for certain observables in baryon spectroscopy, particularly masscombinations organized according to SU(3) flavor breaking. Each large N_c limitgenerates an emergent spin-flavor symmetry that leads to the vanishing ofparticular linear combinations of baryon masses at specific orders in theexpansions. Experimental evidence shows that these relations hold at theexpected orders regardless of which large N_c limit one uses, suggesting thevalidity of either limit in the study of baryons. We also consider a hybridlarge N_c limit in which one flavor is taken to transform in the two-indexantisymmetric representation and the rest of the flavors are in the fundamentalrepresentation. While this hybrid large N_c limit is theoretically attractive,we show that for a wide class of observables it faces some phenomenologicaldifficulties.

All you need is N: Baryon spectroscopy in two large N limits