OPE of the energy-momentum tensor correlator in massless QCD
Abstract
We analytically calculate higher order corrections to coefficient functions of the operator product expansion (OPE) for the Euclidean correlator of two energy-momentum tensors in massless QCD. These are the three-loop contribution to the coefficient C0 in front of the unity operator O0=1 and the one and two-loop contributions to the coefficient C1 in front of the gluon "condensate" operator O1=-1/4 Gμ Gμ . For the correlator of two operators O1 we present the coefficient C1 at two-loop level.
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