New Relations for Excited Baryons in Large N_c QCD

Details New Relations for Excited Baryons in Large N_c QCD New Relations for Excited Baryons in Large N_c QCD

2003-01-20

arxiv.org/abs/hep-ph/0301167v2

Phys.Rev.Lett. 91 (2003) 012001

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, no figures, ReVTeX 4. Includes new discussion of previous work on excited baryon towers

Scientific paper

10.1103/PhysRevLett.91.012001

We show that excited baryons in large N_c QCD form multiplets, within which masses are first split at O(1/N_c). The dominant couplings of resonances to various mesons are highly constrained: The N(1535) decays at leading 1/N_c order exclusively to eta-N rather than pi-N, and vice versa for the N(1650). This multiplet structure is reproduced by a simple large N_c quark model, well studied in the literature, that describes resonances as single-quark excitations.

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