Singlet vs Nonsinglet Perturbative Renormalization of Fermion Bilinears

Abstract

In this paper we present the perturbative evaluation of the difference between the renormalization functions of flavor singlet and nonsinglet bilinear quark operators on the lattice. The computation is performed to two loops and to lowest order in the lattice spacing, for a class of improved lattice actions, including Wilson, tree-level (TL) Symanzik and Iwasaki gluons, twisted mass and SLiNC Wilson fermions, as well as staggered fermions with twice stout-smeared links. In the staggered formalism, the stout smearing procedure is also applied to the definition of bilinear operators.

20 pages, 11 figures. The only difference between v2 and v1 is the inclusion of an Addendum in which conversion factors for different renormalization schemes are individually listed

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