Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: HEPGEN - generator for hard exclusive leptoproduction   HEPGEN is a generator of Monte Carlo events, which is dedicated to studies of
hard exclusive single photon or meson production processes at the COMPASS
experiment kinematic domain. In addition HEPGEN allows to generate also single
photon or meson production accompanied by the diffractive dissociation of the
nucleon, which is one of the main sources of background in analyses of
exclusive processes.

26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph