Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exclusive production of $\rho^0 \rho^0$ pairs in ultrarelativistic heavy
  ion collisions   We disuss exclusive electromagnetic production of two neutral $\rho^0$~mesons
and show the predictions for the $AA \to AA \rho^0 \rho^0$ reactions for
gold-gold collisions at the energy of $\sqrt{s}$ = 200 GeV (RHIC) and for
lead-lead collisions at the energy of $\sqrt{s}$ = 5.5 TeV (LHC). The
elementary cross section is calculated with the help of the
vector-dominance-model (VDM)-Regge approach which usually very well describes
the experimental data at large $\gamma \gamma$ energy. The low-energy $\gamma
\gamma \to \rho^0 \rho^0$ cross section is parametrized. The cross section for
nuclear process is calculated by means of the equivalent photon approximation
(EPA). We compare the results with realistic charge density with the results
for monopole form factor.

9
The categories of this paper are: nlin
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin