A Relation between the Anomalous Dimensions and OPE Coefficients in   Asymptotic Free Field Theories
  In asymptotic free field theories we show that part of the OPE of the trace of the stress-energy tensor and an arbitrary composite field is determined by the anomalous dimension of the composite field. We take examples from the two-dimensional O(N) non-linear sigma model. 
Hidenori Sonoda and Wang-Chang Su