Multiparameter integrable QFT's with N bosons

We introduce a new family of integrable theories with N bosons and N freely adjustable mass parameters. These theories restrict in particular limits t o the "generalized supersymmetric" sine-Gordon models, as well as to the fl avor anisotropic chiral Gross Neveu models (studied recently by N. Andrei a nd collaborators). The scattering theory involves scaler particles that are no bound states, and bears an intriguing resemblance with the results of a sharp cut-off analysis of the Thirring model carried out by Korepin in 198 0. Various physical applications are discussed. In particular, we demonstra te that our theories are the appropriate continuum limit of integrable quan tum spin chains with mixtures of spins. (C) 1998 Elsevier Science B.V.