R. Flores-mendieta et al., Baryon-pion scattering in the 1/N-c expansion: Tree diagram cancellations - art. no. 116014, PHYS REV D, 6111(11), 2000, pp. 6014
Tree amplitudes for baryon-pion scattering are studied in the 1/N-c expansi
on. Generalized large-N-c consistency conditions are obtained to all orders
in baryon mass splittings. For baryons with spin J similar to O(1), the le
ading order in N-c tree amplitudes can be evaluated keeping only terms up t
o a given finite order in baryon mass splittings.