ar X iv : h ep - p h / 03 01 16 7 v 2 24 J an 2 00 3 New Relations for Excited Baryons in Large N c QCD

نویسندگان

  • Thomas D. Cohen
  • Richard F. Lebed
چکیده

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.

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تاریخ انتشار 2005