Baryons, INc
Richard F. Lebed
Abstract
Excited baryons may be analyzed in the 1/Nc expansion as true resonances in scattering amplitudes. The key idea making this program possible is a generalization of methods originally applied to chiral soliton models in the 1980's. One finds model-independent relations among amplitudes that impose mass and width degeneracies among resonances of various quantum numbers. Phenomenological evidence demonstrates that patterns of resonant decay predicted by 1/Nc agree with data. The analysis can be extended to subleading orders in 1/Nc, where again agreement with data is evident.
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