Phys. Rev. Lett. 91, 012001 (2003) [4 pages]New Relations for Excited Baryons in Large-Nc QCDReceived 24 January 2003; published 2 July 2003 We show that excited baryons in large-Nc QCD form multiplets, within which masses are first split at O(1/Nc). The dominant couplings of resonances to various mesons are highly constrained: The N(1535) decays at leading 1/Nc order exclusively to η-N rather than π-N, and vice versa for the N(1650). This multiplet structure is reproduced by a simple large-Nc quark model, well studied in the literature, that describes resonances as single-quark excitations. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.012001
DOI:
10.1103/PhysRevLett.91.012001
PACS:
12.38.–t, 11.15.Pg, 12.39.–x, 14.20.Gk
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