Decoupling spurious baryon states in the 1/Nc expansion of QCD

Thomas D. Cohen, Richard Lebed

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10 Scopus citations


We identify spurious states in meson-baryon scattering, those that appear in QCD for Nc>3 but decouple for Nc=3. The key observation is that the relevant flavor SU(3) Clebsch-Gordan coefficients contain factors of 1-3/Nc. We show that this method works even if SU(3) is badly broken. We also observe that resonant scattering poles lying outside naive quark-model multiplets are not necessarily large Nc artifacts, and can survive via configuration mixing at Nc=3.

Original languageEnglish (US)
Article number036001
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number3
StatePublished - Aug 7 2006


ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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