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

Thomas D. Cohen, Richard Lebed

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

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
Volume74
Issue number3
DOIs
StatePublished - 2006

Fingerprint

Baryon
Decoupling
decoupling
baryons
quantum chromodynamics
Scattering
Clebsch-Gordan coefficients
expansion
quark models
scattering
Mesons
Quarks
Pole
artifacts
poles
mesons
fine structure
Configuration
Coefficient
configurations

ASJC Scopus subject areas

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

Cite this

Decoupling spurious baryon states in the 1/Nc expansion of QCD. / Cohen, Thomas D.; Lebed, Richard.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 74, No. 3, 036001, 2006.

Research output: Contribution to journalArticle

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