TY - JOUR
T1 - Decoupling spurious baryon states in the 1/Nc expansion of QCD
AU - Cohen, Thomas D.
AU - Lebed, Richard
PY - 2006
Y1 - 2006
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevD.74.036001
DO - 10.1103/PhysRevD.74.036001
M3 - Article
AN - SCOPUS:33746622927
SN - 1550-7998
VL - 74
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 3
M1 - 036001
ER -