Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Azimuthal asymmetries in exclusive four-particle "Drell-Yan" events,
  with lepton-antilepton plus proton-antiproton detection, in proton-antiproton
  scattering   I study hard collisions between unpolarized protons and antiprotons where a
lepton-antilepton pair is detected in coincidence with a final
proton-antiproton pair, and no more particles are produced, in the regime 10
GeV^2 << s << 1000 GeV^2, M > 4 GeV, q_T < 3 GeV/c. The present work is
centered on azimuthal asymmetries. Because of momentum conservation, a
Boer-Mulders term in the momentum distribution of a quark implies a balancing
effect in the momentum distribution of some spectators. This produces azimuthal
asymmetries of the final hadrons. To analyze this, I have organized a
parton-level MonteCarlo generator where a standard cos(2phi)-asymmetry of the
dilepton distribution is produced, thanks to a soft rescattering process
between an active quark coming from a hadron and a spectator anti-diquark
coming from the other hadron. This produces cos(2phi)-asymmetries of the final
hadron pair. Hadron and lepton asymmetries have the same size.

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The categories of this paper are: nucl-th
1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an
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The categories of this paper are: hep-lat
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The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
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The categories of this paper are: stat
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The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
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The categories of this paper are: q-alg
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The categories of this paper are: comp-gas
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The categories of this paper are: patt-sol
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The categories of this paper are: acc-phys
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The categories of this paper are: gr-qc
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The categories of this paper are: q-bio
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The categories of this paper are: hep-ex