Excited baryon decay widths in large Nc QCD

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

Research output: Contribution to journalArticle

46 Scopus citations

Abstract

We study excited baryon decay widths in large Nc QCD. It was suggested previously that some spin-flavor mixed-symmetric baryon states have strong couplings of O(Nc-1/2) to nucleons [implying narrow widths of O(1/Nc)], as opposed to the generic expectation based on Witten's counting rules of an O(Nc0) 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 Nc QCD. We show that a general large Nc QCD analysis does not predict such narrow states; rather they are a consequence of the extreme simplicity of the quark model.

Original languageEnglish (US)
Article number056001
JournalPhysical Review D
Volume69
Issue number5
DOIs
StatePublished - 2004

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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