Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A 5D, polarised, Bethe-Heitler event generator for $\gamma \to
  \mu^+\mu^-$ conversion   I describe a five-dimensional, polarised, Bethe-Heitler event generator of
$\gamma$-ray conversions to $\mu^+\mu^-$, based on a generator for conversion
to $e^+e^-$ developed in the past. Verifications are performed from
close-to-threshold to high energies.

18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
2
The categories of this paper are: math
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph