Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Four-loop photon quark form factor and cusp anomalous dimension in the
  large-$N_c$ limit of QCD   We compute the four-loop QCD corrections to the massless
quark-anti-quark-photon form factor $F_q$ in the large-$N_c$ limit. From the
pole part we extract analytic expressions for the corresponding cusp and
collinear anomalous dimensions.

35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics