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Exclusive leptoproduction of \(\rho^0\) mesons from hydrogen at intermediate virtual photon energies

  • The HERMES Collaboration
  • A. Airapetian et al.
Experimental physics

Abstract.

Measurements of the cross section for exclusive virtual-photoproduction of \(\rho^0\) mesons from hydrogen are reported. The data were collected by the HERMES experiment using 27.5 GeV positrons incident on a hydrogen gas target in the HERA storage ring. The invariant mass W of the photon-nucleon system ranges from 4.0 to 6.0 GeV, while the negative squared four-momentum \(Q^2\) of the virtual photon varies from 0.7 to 5.0 GeV\(^2\). The present data together with most of the previous data in the intermediate W-domain are well described by a model that infers the W-dependence of the cross section from the dependence on the Bjorken scaling variable x of the unpolarized structure function for deep-inelastic scattering. In addition, a model calculation based on Off-Forward Parton Distributions gives a fairly good account of the longitudinal component of the \(\rho^0\) production cross section for \(Q^2>2\) GeV\(^2\).

Keywords

Structure Function Invariant Mass Production Cross Production Cross Section Parton Distribution 
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

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • The HERMES Collaboration
  • A. Airapetian et al.
    • 1
  1. 1.Yerevan Physics Institute, 375036, Yerevan, ArmeniaAM

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