Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Operator product expansion on the lattice: analytic Wilson coefficients   We present first results for Wilson coefficients of operators up to first
order in the covariant derivatives for the case of Wilson fermions. They are
derived from the off-shell Compton scattering amplitude
$\mathcal{W}_{\mu\nu}(a,p,q)$ of massless quarks with momentum $p$. The Wilson
coefficients are classified according to the transformation of the
corresponding operators under the hypercubic group H(4). We give selected
examples for a special choice of the momentum transfer $q$. All Wilson
coefficients are given in closed analytic form and in an expansion in powers of
$a$ up to first corrections.

9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc