SOLITONIC INTEGRABLE PERTURBATIONS OF PARAFERMIONIC THEORIES

The quantum integrability of a class of massive perturbations of the p arafermionic conformal field theories associated to compact Lie groups is established by showing that they have quantum conserved densities of scale dimension 2 and 3. These theories are integrable for any valu e of a continuous vector coupling constant, and they generalize the pe rturbation of the minimal parafermionic models by their first thermal operator. The classical equations of motion of these perturbed theorie s are the non-abelian affine Toda equations which admit (charged) soli ton solutions whose semi-classical quantization is expected to permit the identification of the exact S-matrix of the theory. (C) 1997 Elsev ier Science B.V.