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Investigations of azimuthal asymmetry in semi-inclusive leptoproduction

  • K.A. Oganessyan
  • H.R. Avakian
  • N. Bianchi
  • P. Di Nezza
Theoretical physics

Abstract.

We consider the azimuthal asymmetries in semi-inclusive deep inelastic leptoproduction arising due to both perturbative and nonperturbative effects at HERMES energies and show that the \(k_T^2/Q^2\) order corrections to \(\langle \cos\phi \rangle\) and \(\langle \cos2\phi \rangle\) are significant. We also reconsider the results of perturbative effects for \(\langle \cos\phi \rangle\) at large momentum transfers [1] using the more recent sets of scale-dependent distribution and fragmentation functions, which bring up to 18% difference in \(\langle \cos\phi \rangle\). In the same approach we calculate the \(\langle \cos2\phi \rangle\) as well.

Keywords

Momentum Transfer Order Correction Fragmentation Function Large Momentum Large Momentum Transfer 
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Copyright information

© Springer-Verlag Berlin Heidelberg 1998

Authors and Affiliations

  • K.A. Oganessyan
    • 1
  • H.R. Avakian
    • 1
  • N. Bianchi
    • 1
  • P. Di Nezza
    • 1
  1. 1. LNF-INFN, C.P. 13, Enrico Fermi 40, Frascati, Italy (e-mail: kogan@lnf.infn.it, avakian@lnf.infn.it, bianchi@lnf.infn.it, dinezza@lnf.infn.it) IT

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