Exact S-matrices for the nonsimply-laced affine Toda theories a(2)2n−1

Abstract We derive the exact, factorized, purely elastic scattering matrices for the a (2) 2n−1 family of nonsimply-laced affine Toda theories. The derivation takes into account the distortion of the classical mass spectrum by radiative corrections, as well as modifications of the usual bootstrap assumptions since for these theories anomalous threshold singularities lead to a displacement of some single particle poles.