Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two-photon decay rates of heavy quarkonia in the relativistic quark
  model   Two-photon decay rates of pseudoscalar, scalar and tensor states of
charmonium and bottomonium are calculated in the framework of the relativistic
quark model. Both relativistic effects and one-loop radiative corrections are
taken into account. The obtained results are compared with other theoretical
predictions and available experimental data.

29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an