Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Muon Pair Production in Radiative Decays of Heavy Quarkonia   Muon pair production in exclusive radiative decays $\chi_{cJ}\to J/\psi
\mu\mu$, $\chi_{bJ}\to\Upsilon\mu\mu$ are considered. We present numerical
values of the branching fractions and distributions over various kinematical
variables.

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The categories of this paper are: acc-phys
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The categories of this paper are: adap-org
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The categories of this paper are: cs
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The categories of this paper are: astro-ph
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The categories of this paper are: solv-int
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The categories of this paper are: mtrl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: eess
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The categories of this paper are: cmp-lg
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The categories of this paper are: gr-qc
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The categories of this paper are: patt-sol
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The categories of this paper are: ao-sci
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The categories of this paper are: dg-ga
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The categories of this paper are: quant-ph
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-th