Positive parity pentaquark towers in large Nc QCD

Dan Pirjol, Carlos Schat

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3 Scopus citations

Abstract

We construct the complete set of positive parity pentaquarks, which correspond in the quark model to s̄qNc+1 states with one unit of orbital angular momentum L=1. In the large Nc limit they fall into the K=1/2 and K=3/2 irreps (towers) of the contracted SU(4)c symmetry. We derive predictions for the mass spectrum and the axial couplings of these states at leading order in 1/Nc. The strong decay width of the lowest-lying positive parity exotic state is of order O(1/Nc), such that this state is narrow in the large Nc limit. Replacing the antiquark with a heavy antiquark Q̄qNc+1, the two towers become degenerate, split only by O(1/mQ) hyperfine interactions. We obtain predictions for the strong decay widths of heavy pentaquarks to ordinary baryons and heavy HQ̄(*) mesons at leading order in 1/Nc and 1/mQ.

Original languageEnglish
Article number076004
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume75
Issue number7
DOIs
StatePublished - 25 Apr 2007

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