2-POINT CORRELATION-FUNCTION IN SCALING LEE-YANG MODEL

The structure of the UV singularity in the two-point correlation function is considered for the scaling Lee-Yang model. Both perturbative and nonperturbative corrections to UV conformal theory are discussed. The IR convergent perturbation theory for the structure functions of operator algebra is developed and the first-order corrections are calculated explicitly. The UV expansion is compared numerically with the results of partial summation over intermediate asymptotic states. These two expansions match well in the intermediate region and give a reasonable precision data for the correlation function in the whole region of scaling distances.