Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exclusive diffractive production of $\pi^{+}\pi^{-}\pi^{+}\pi^{-}$ via
  the intermediate $\sigma\sigma$ and $\rho\rho$ states in proton-proton
  collisions within tensor pomeron approach   We present first predictions of the cross sections and differential
distributions for the central exclusive reaction $pp \to pp \pi^{+} \pi^{-}
\pi^{+} \pi^{-}$ being studied at RHIC and LHC. The amplitudes for the
processes are formulated in terms of the tensor pomeron and tensor $f_{2 R}$
reggeon exchanges with the vertices respecting the standard crossing and
charge-conjugation relations of Quantum Field Theory. The $\sigma \sigma$ and
$\rho \rho$ contributions to the $\pi^{+} \pi^{-} \pi^{+} \pi^{-}$ final state
are considered focussing on their specificities. The correct inclusion of the
pomeron spin structure seems crucial for the considered sequential mechanisms
in particular for the $\rho\rho$ contribution which is treated here for the
first time. The mechanism considered gives a significant contribution to the
$pp \to pp \pi^{+} \pi^{-} \pi^{+} \pi^{-}$ reaction. We adjust parameters of
our model to the CERN-ISR experimental data and present several predictions for
the STAR, ALICE, ATLAS and CMS experiments. A measurable cross section of order
of a few $\mu b$ is obtained including the experimental cuts relevant for the
LHC experiments. We show the influence of the experimental cuts on the
integrated cross section and on various differential distributions.

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The categories of this paper are: comp-gas
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The categories of this paper are: adap-org
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The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
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The categories of this paper are: chem-ph
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The categories of this paper are: atom-ph
3
The categories of this paper are: physics
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The categories of this paper are: eess
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-th
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The categories of this paper are: cond-mat
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The categories of this paper are: chao-dyn
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The categories of this paper are: math
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The categories of this paper are: gr-qc
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The categories of this paper are: stat
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The categories of this paper are: math-ph