A determinant representation for a correlation function of the scaling Lee-Yang model

We consider the scaling Lee-Yang model. It corresponds to the unique perturbation of the minimal CFT model M-2,M-5. This model is not unitary. We are using an expression for form factors in terms of symmetric polynomials in order to obtain a closed expression for the correlation function of the trace of the energy-momentum tenser. This expression is a determinant of an integral operator. Similar determinant representations were proven to be useful not only for quantum correlation functions but also in matrix models.