The permutation group S_N and large Nc excited baryons

Abstract

We study the excited baryon states for an arbitrary number of colors Nc from the perspective of the permutation group S_N of N objects. Classifying the transformation properties of states and quark-quark interaction operators under S_N allows a general analysis of the spin-flavor structure of the mass operator of these states, in terms of a few unknown constants parameterizing the unknown spatial structure. We explain how to perform the matching calculation of a general two-body quark-quark interaction onto the operators of the 1/Nc expansion. The inclusion of core and excited quark operators is shown to be necessary. Considering the case of the negative parity L=1 states transforming in the MS of S_N, we discuss the matching of the one-gluon and the Goldstone-boson exchange interactions.

38 pages. Final version to be published in Physical Review D

References in corpus (2)

• Baryonic mass formula in large $N_c$ QCD versus quark model
• Positive parity pentaquark towers in large Nc QCD

Cited by in corpus (2)

• Analysis of Negative Parity Baryon Photoproduction Amplitudes in the $1/N_c$ Expansion
• Excited Baryons in Large Nc QCD: Matching the 1/Nc expansion to quark models using the permutation group S_N