An update on the status of NSPT computations

Abstract

We will discuss final results obtained by the Parma group for the computation of renormalization constants of quark bilinears for the regularizations defined by nf=2 Wilson fermions/tree level Symanzik improved gauge and nf=4 Wilson fermions/Iwasaki improved gauge actions. Computation has been performed in the framework of Numerical Stochastic Perturbation Theory (NSPT) up to three loop. Perturbative results will be compared with the ones coming from non perturba-tive determinations.