Exclusive Electroproduction of $ρ^0$ and $J/ψ$ Mesons at HERA

Details Exclusive Electroproduction of $ρ^0$ and $J/ψ$ Mesons at HERA Exclusive Electroproduction of $ρ^0$ and $J/ψ$ Mesons at HERA

1998-08-20

arxiv.org/abs/hep-ex/9808020v3

Eur.Phys.J.C6:603-627,1999

Physics

High Energy Physics

High Energy Physics - Experiment

57 pages including 21 figures, minor modifications to Figs. 19-21, these figures supercede those of Eur. Phys. J. C6 (1999) 60

Scientific paper

10.1007/s100529901051

Exclusive production of $\rho^0$ and $J/\psi$ mesons in e^+ p collisions has been studied with the ZEUS detector in the kinematic range $0.25 < Q^2 < 50 GeV^2, 20 < W < 167 GeV$ for the $\rho^0$ data and $2 < Q^2 < 40 GeV^2, 50 < W < 150 GeV$ for the $J/\psi$ data. Cross sections for exclusive $\rho^0$ and $J/\psi$ production have been measured as a function of $Q^2, W$ and $t$. The spin-density matrix elements $r^{04}_{00}, r^1_{1-1}$ and $Re r^{5}_{10}$ have been determined for exclusive $\rho^0$ production as well as $r^{04}_{00}$ and $r^{04}_{1-1}$ for exclusive $J/\psi$ production. The results are discussed in the context of theoretical models invoking soft and hard phenomena.

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