Phenomenology of the Baryon Resonance 70-plet at Large N_c

We examine the multiplet structure and decay channels of baryon resonances in the large N_c QCD generalization of the N_c = 3 SU(6) spin-flavor 70. We show that this 70'', while a construct of large N_c quark models, actually consists of five model-independent irreducible spin-flavor multiplets in the large N_c limit. The preferred decay modes for these resonances fundamentally depend upon which of the five multiplets to which the resonance belongs. For example, there exists an SU(3) 8’’ of resonances that is eta-philic and pi-phobic, and an 8'' that is the reverse. Moreover, resonances with a strong SU(3) 1’’ component prefer to decay via a K-bar rather than via a pi. Remarkably, available data appears to bear out these conclusions.