Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: UltraPeripheral Collisions in STAR   Ultra-peripheral heavy ion collisions involve long range electromagnetic
interactions at impact parameters larger than twice the nuclear radius, where
no hadronic nucleon-nucleon collisions occur. The first observation of coherent
rho production with and without nuclear breakup, along with the observation of
ee pair production, are reported by the STAR collaboration.

4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph