Phenomenology of the Baryon Resonance 70-plet at Large N_c

Details Phenomenology of the Baryon Resonance 70-plet at Large N_c Phenomenology of the Baryon Resonance 70-plet at Large N_c

2005-07-22

arxiv.org/abs/hep-ph/0507267v1

Phys.Rev. D72 (2005) 056001

Physics

High Energy Physics

High Energy Physics - Phenomenology

26 pages, ReVTeX

Scientific paper

10.1103/PhysRevD.72.056001

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.

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