Form factors for principal chiral field model with Wess-Zumino-Novikov-Witten term

Abstract

We construct the form factors of the trace of energy-momentum tensor for the massless model described by $SU(2)$ principal chiral field model with WZNW tern on level 1. We explain how this construction can be generalized to a class of integrable massless models including the flow from tricritical to critical Ising model.

9 pages, LATEX

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