Double-spin asymmetries in the cross section of \(\rho^0\) and \(\phi\) production at intermediate energies

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

Abstract.

Double-spin asymmetries in the cross section of electroproduction of \(\rho^0\) and \(\phi\) mesons on the proton and deuteron are measured at the HERMES experiment. The photoabsorption asymmetry in exclusive \(\rho^0\) electroproduction on the proton exhibits a positive tendency. This is consistent with theoretical predictions that the exchange of an object with unnatural parity contributes to exclusive \(\rho^0\) electroproduction by transverse photons. The photoabsorption asymmetry on the deuteron is found to be consistent with zero. Double-spin asymmetries in \(\rho^0\) and \(\phi\) meson electroproduction by quasi-real photons were also found to be consistent with zero; the asymmetry in the case of the \(\phi\) meson is compatible with a theoretical prediction which involves \(s\bar{s}\) knockout from the nucleon.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Springer-Verlag Berlin Heidelberg / Società Italiana di Fisica 2003

Authors and Affiliations

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

Personalised recommendations