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The European Physical Journal A

, Volume 45, Issue 3, pp 301–310 | Cite as

Azimuthal asymmetries in exclusive four-particle “Drell-Yan” events

  • A. BianconiEmail author
Regular Article - Theoretical Physics
  • 33 Downloads

Abstract.

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 GeV2 ≪ s ≪ 1000 GeV2 , 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 Monte Carlo generator where a standard cos(2\( \phi\)) -asymmetry of the dilepton distribution is produced, thanks to a soft rescattering process between an active quark coming from a hadron and a spectator antidiquark coming from the other hadron. This produces cos(2\( \phi\)) -asymmetries of the final hadron pair. Hadron and lepton asymmetries have the same size.

Keywords

Transverse Momentum Momentum Distribution Azimuthal Asymmetry Lepton Asymmetry Hadron Tensor 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© SIF, Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  1. 1.Dipartimento di Chimica e Fisica per l’Ingegneria e per i MaterialiUniversità di BresciaBresciaItaly
  2. 2.Istituto Nazionale di Fisica Nucleare, Sezione di PaviaPaviaItaly

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