Excited L=1 baryons in large Nc QCD

Details Excited L=1 baryons in large Nc QCD Excited L=1 baryons in large Nc QCD

2003-08-12

arxiv.org/abs/hep-ph/0308125v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, aipproc style files, talk given by D.P. at the 8th Conference on the Intersections of Particle and Nuclear Physics (C

Scientific paper

10.1063/1.1664297

The physics of the orbitally excited baryons simplifies drastically in the large Nc limit. The states are arranged into irreducible representations of the contracted SU(4)_c symmetry, with mixing angles determined exactly. The ratios of the strong couplings N* -> [N\pi]_{S,D} are predicted in this limit, with results in agreement with those following from the quark model (with the large Nc mixing angles). We present a phenomenological analysis of the observed nonstrange baryons from the perspective of the 1/Nc expansion, including constraints from their masses and strong decays.

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