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Excited Baryon Decay Widths in Large N_c QCD

Thomas D. Cohen·Daniel C. Dakin·Richard F. Lebed·Abhinav Nellore
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Abstract

We study excited baryon decay widths in large N_c QCD. It was suggested previously that some spin-flavor mixed-symmetric baryon states have strong couplings of O(N_c^{-1/2}) to nucleons [implying narrow widths of O(1/N_c)], as opposed to the generic expectation based on Witten's counting rules of an O(N_c^0) coupling. The calculation obtaining these narrow widths was performed in the context of a simple quark-shell model. This paper addresses the question of whether the existence of such narrow states is a general property of large N_c QCD. We show that a general large N_c QCD analysis does not predict such narrow states; rather they are a consequence of the extreme simplicity of the quark model.

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Thomas D. Cohen, Daniel C. Dakin, Richard F. Lebed, Abhinav Nellore. 2003-10-09. Excited Baryon Decay Widths in Large N_c QCD. https://doi.org/10.1103/physrevd.69.056001

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