Correlation functions of descendants in the scaling Lee–Yang model

Correlation functions of the composite field $T\bar{T}$ in the scaling Lee–Yang model are studied. Using the analytic expression for form factors of this operator recently proposed by G. Delfino and G. Niccoli, hep-th/0407142 [1], we show numerically that the constraints on the $T\bar{T}$ expectation values obtained in A. B. Zamolodchikov, hep-th/0401146 [2] and the additional requirement of asymptotic behavior lead to a perfect agreement with the ultraviolet asymptotic predicted by the conformal perturbation theory.