Compatibility of quark and resonant picture excited baryon multiplets in the 1/Nc expansion of QCD

Thomas D. Cohen, Richard Lebed

Research output: Contribution to journalArticlepeer-review

40 Scopus citations


We demonstrate that the two major complementary pictures of large N c baryon resonances - as single-quark orbital excitations about a closed-shell core [giving SU(2NF) × O(3) multiplets], and as resonances in mesonbaryon scattering amplitudes - are completely compatible in a specific sense: Both pictures give rise to a set of multiplets of degenerate states, for which any complete spin-flavor multiplet within one picture fills the quantum numbers of complete multiplets in the other picture. This result is demonstrated by (i) straightforward computation of the lowest multiplets in both pictures, (ii) a study of the nature of quark excitations in a hedgehog picture, and (iii) direct group-theoretical comparison of the constraints in the two pictures.

Original languageEnglish (US)
Article number056003
JournalPhysical Review D
Issue number5
StatePublished - 2003

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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