Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Renormalisation of composite operators in lattice QCD: perturbative
  versus nonperturbative   The perturbative and nonperturbative renormalisation of quark-antiquark
operators in lattice QCD with two flavours of clover fermions is investigated
within the research programme of the QCDSF collaboration. Operators with up to
three derivatives are considered. The nonperturbative results based on the
RI-MOM scheme are compared with estimates from one- and two-loop lattice
perturbation theory.

13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
2
The categories of this paper are: math