The determination of renormalization factors is of crucial importance in lattice QCD. They relate the observables obtained on the lattice to their measured counterparts in the continuum in a suitable renormalization scheme. Therefore, they have to be computed as precisely as possible. A widely used approach is the nonperturbative Rome-Southampton method. It requires, however, a careful treatment of lattice artifacts. In this paper we investigate a method to suppress these artifacts by subtracting one-loop contributions to renormalization factors calculated in lattice perturbation theory. We compare results obtained from a complete one-loop subtraction with those calculated for a subtraction of contributions proportional to the square of the lattice spacing.
@article{arxiv.1303.6776,
title = {Perturbatively improving RI-MOM renormalization constants},
author = {M. Constantinou and M. Costa and M. Gockeler and R. Horsley and H. Panagopoulos and H. Perlt and P. E. L. Rakow and G. Schierholz and A. Schiller},
journal= {arXiv preprint arXiv:1303.6776},
year = {2013}
}