Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Color-Singlet and Color-Octet Contributions to $J/\psi$ Photoproduction   I discuss the impact of color-octet contributions and higher-order QCD
corrections on the cross section for inelastic $J/\psi$ photoproduction. The
theoretical predictions are compared with recent experimental data obtained at
HERA.

9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an