Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photon-exchange processes at hadron colliders as a probe of the dynamics
  of diffraction   The rich structure of photon-exchange processes at hadron colliders is
studied. We discuss central vector meson production pp --> p + J/psi + p, W
production pp --> p + W + X and mu+ mu- production. Each process has distinct,
and large, soft pp rescattering effects, which can be directly observed by
detecting the outgoing protons. This allows a probe of the optical density of
the proton, which plays a crucial role in the evaluation of the rapidity gap
survival probabilities in diffractive-like processes at hadron colliders. We
note that an alternative mechanism for J/psi production is odderon, instead of
photon, exchange; and that the ratio of odderon to photon contributions is
enhanced (suppressed) for phi(Upsilon) vector meson production.

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The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
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The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
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The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin