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

TL;DR

This paper constructs form factors for the energy-momentum tensor in a massless $SU(2)$ principal chiral model with WZNW term, providing a method applicable to various integrable massless models including critical flows.

Contribution

It introduces a construction of form factors for the energy-momentum tensor in a specific massless integrable model, generalizable to other models with similar structures.

Findings

Form factors explicitly constructed for the $SU(2)$ principal chiral model with WZNW term.

Method applicable to a class of integrable massless models including flow from tricritical to critical Ising.

Provides insights into the structure of form factors in massless integrable quantum field theories.

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.