1209.1516 (M. F. Zoller et al.)

OPE of the energy-momentum tensor correlator in massless QCD    [PDF]

M. F. Zoller, K. G. Chetyrkin

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 $C_0$ in front of the unity operator $O_0=\mathds{1}$ and the one and two-loop contributions to the coefficient $C_1$ in front of the gluon "condensate" operator $O_1=-\f{1}{4} G^{\mu \nu}G_{\mu \nu}$. For the correlator of two operators $O_1$ we present the coefficient $C_1$ at two-loop level.

View original: http://arxiv.org/abs/1209.1516