Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two loop lattice expansion of the Schroedinger functional coupling in
  improved QCD   The contributions of the improved fermion action of Sheikholeslami and
Wohlert to the two loop coefficient of the expansion of the Schroedinger
functional coupling in terms of the lattice coupling are calculated for the
gauge group SU(3). These coefficients are required for the second order
relation of lattice data to the MSbar-coupling. By taking into account all
improvement coefficients we are able to improve the Schroedinger functional to
two loop order.

2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn