Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Differential Renormalization of QCD in the Background-Field Method   A short outline is given on the application of differential regularization to
QCD in the background-field method. The derivation of the propagators in the
background gluon field as short-distance expansions is described and the
renormalization of the theory is mentioned.

19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin