Two and three loops computations of renormalization constants for lattice QCD
Abstract
Renormalization constants can be computed by means of Numerical Stochastic Perturbation Theory to two/three loops in lattice perturbation theory, both in the quenched approximation and in the full (unquenched) theory. As a case of study we report on the computation of renormalization constants of the propagator for Wilson fermions. We present our unquenched (Nf=2) computations and compare the results with non perturbative determinations.
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