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Perturbative subtraction of lattice artifacts in the computation of renormalization constants
Constantinou, M Costa, M Göckeler, M Horsley, R Panagopoulos, H Perlt, H Rakow, PEL Schierholz, G Schiller, A
Constantinou, M
Costa, M
Göckeler, M
Horsley, R
Panagopoulos, H
Perlt, H
Rakow, PEL
Schierholz, G
Schiller, A
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Conference Proceeding
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2012-01-01
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The determination of renormalization factors is of crucial importance. They relate the observ- ables obtained on finite, discrete lattices 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. They are always present because simulations are done at lattice spacings a and momenta p with ap not necessarily small. In this paper we try to suppress these artifacts by subtraction of one-loop contributions in lattice perturbation theory. We compare results obtained from a complete one-loop subtraction with those calculated for a subtraction of O(a2).
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Proceedings of Science
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