Photo-production of psi' Mesons at HERA

Details Photo-production of psi' Mesons at HERA Photo-production of psi' Mesons at HERA

1997-11-19

arxiv.org/abs/hep-ex/9711012v1

Phys.Lett.B421:385-394,1998

Physics

High Energy Physics

High Energy Physics - Experiment

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

Scientific paper

10.1016/S0370-2693(97)01529-3

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).

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