A vertex operator approach for form factors of Belavin's -symmetric model**Dedicated to the memory of my parents.

Abstract

Belavin's -symmetric model is considered on the basis of bosonization of vertex operators in the A(1)n − 1 model and vertex-face transformation. Free-field representations of nonlocal tail operators are constructed for off-diagonal matrix elements with respect to the ground state sectors. As a result, integral formulae for form factors of any local operators in the -symmetric model can, in principle, be obtained.