Exclusive electroproduction of phi mesons at HERA

Collaboration
Apr, 2005
37 pages
Published in:
  • Nucl.Phys.B 718 (2005) 3-31
e-Print:
Report number:
  • DESY-05-038
Experiments:

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Abstract:
Exclusive electroproduction of ϕ\phi mesons has been studied in e±pe^\pm p collisions at \sqrt{s}=318 \gev with the ZEUS detector at HERA using an integrated luminosity of 65.1 pb1^{-1}. The γp\gamma^*p cross section is presented in the kinematic range 2Q2Q^2, WW, tt and helicity angle θh\theta_h are compared to cross sections for other vector mesons. The ratios RR of the cross sections for longitudinally and transversely polarized virtual photons are presented as functions of Q2Q^2 and WW. The data are also compared to predictions from theoretical models.
Note:
  • 29 pages, 10 figures, 7 tables, accepted by Nucl. Phys. B Report-no: DESY 05-038
  • positron p: colliding beams
  • electron p: colliding beams
  • electron p: electroproduction
  • Phi(1020): electroproduction
  • vector meson: electroproduction
  • Phi(1020): hadronic decay
  • mass spectrum: (K+ K-)
  • differential cross section
  • momentum transfer dependence
  • energy dependence