Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Diffractive exclusive production of heavy quark pairs at high energy
  proton-proton collisions   We discuss exclusive double diffractive (EDD) production of heavy quark -
heavy antiquark pairs at high energies. Differential distributions for $c \bar
c$ at $\sqrt{s}$ = 1.96 GeV and for $b \bar b$ at $\sqrt{s}$ = 14 TeV are shown
and discussed. Irreducible leading-order $b \bar b $ background to Higgs
production is calculated for the first time in several kinematical variables.
The signal-to-background ratio is shown and several improvements are suggested.

35
The categories of this paper are: mtrl-th
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The categories of this paper are: supr-con
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
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The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
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The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn