Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Perturbative renormalization of GPDs to O(a^2), for various
  fermion/gluon actions   We present a 1-loop perturbative calculation of the fermion propagator, up to
O(a^2) (a: lattice spacing). The fermions are described by Wilson, clover and
twisted-mass actions; for gluons we use Symanzik improved actions (Plaquette,
Tree-level Symanzik, Iwasaki, TILW, DBW2). Our results are given in a general
covariant gauge, and their dependence on the coupling constant, the external
momentum, the masses and the clover parameter is shown explicitly. We also
study the O(a^2) corrections to matrix elements of unpolarized/polarized
fermion bilinear operators, which include up to one derivative. These
corrections are essential ingredients for improving, to O(a^2), the
renormalization constants of the operators under study. In addition, they can
be used to minimize lattice artifacts in non-perturbative studies.

27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics