Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: $\eta$ Production in Peripheral Heavy-Ion Collisions   We estimate the impact parameter dependence of the production cross section
for $\eta_c$ and $\eta_b$ mesons in peripheral heavy-ion collisions collisions.
Total and elastic $\gamma\gamma$ cross sections are calculated in an equivalent
photon approximation.

29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph