Some Three-body force cancellations in Chiral Lagrangians
  The cancellation between off-shell two body forces and three body forces implies a tremendous simplification in the study of three body resonances in two meson-one baryon systems. While this can be done by means of Faddeev equations we provide an alternative and simpler derivation using just the chiral Lagrangian and the field re-parametrization invariance. 
E. Ruiz Arriola
nucl-th hep-ph