Photo-production of psi' Mesons at HERA

Abstract

Quasi-elastic (z >0.95) photo-production of psi' mesons has been observed at HERA for photon-proton centre-of-mass energies in the range 40 to 160 GeV. The psi' mesons were identified through their decays to l+l- and to J/psi pi+ pi-, where the J/psi subsequently decays to l+l-, the lepton l being either a muon or an electron. The cross-section for quasi-elastic photoproduction was measured to be [18.0 +- 2.8 (stat) +- 3.0(syst)] nb at a photon-proton centre-of-mass energy of 80 GeV. The ratio of the psi' to J/psi quasi-elastic cross-sections is 0.150 +- 0.027 (stat) +- 0.022 (syst).

13 pages, 4 figures, submitted to Phys. Lett. B

References in corpus (6)

• Novel Color Transparency Effect: Scanning the Wave Function of Vector Mesons
• Elastic and Inelastic Photoproduction of \jpsi Mesons at HERA
• Measurement of the Cross Section for the Reaction $γp \to \jpsi~p$ with the ZEUS Detector at HERA
• Elastic Electroproduction of $\rh0$ and $J/\Psi$ Mesons at large $Q^2$ at HERA
• Measurement of Elastic $J/\psi$ Photoproduction at HERA
• Study of Elastic rho0 photoproduction at HERA using the ZEUS Leading Proton Spectrometer

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