Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photonuclear and Two-photon Interactions at High-Energy Nuclear
  Colliders   Ultra-peripheral collisions of heavy ions and protons are the energy frontier
for electromagnetic interactions. Both photonuclear and two-photon collisions
are studied, at collision energies that are far higher than are available
elsewhere. In this review, we will discuss physics topics that can be addressed
with UPCs, including nuclear shadowing and nuclear structure and searches for
beyond-standard-model physics.

35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs