Elastic Electroproduction of $\rh0$ and $J/Ψ$ Mesons at large $Q^2$ at HERA

Details Elastic Electroproduction of $\rh0$ and $J/Ψ$ Mesons at large $Q^2$ at HERA Elastic Electroproduction of $\rh0$ and $J/Ψ$ Mesons at large $Q^2$ at HERA

1996-02-23

arxiv.org/abs/hep-ex/9602007v1

Nucl.Phys.B468:3-36,1996

Physics

High Energy Physics

High Energy Physics - Experiment

29 pages, latex, 7 Figures appended as uuencoded file

Scientific paper

10.1016/0550-3213(96)00192-7

The total cross sections for the elastic electroproduction of $\rh0$ and $J/\Psi$ mesons for $Q^2$ $>$ 8 GeV$^2$ and $ \simeq 90$ GeV/c$^2$ are measured at HERA with the H1 detector. The measurements are for an integrated electron$-$proton luminosity of $\simeq$~3~pb$^{-1}$. The dependences of the total virtual photon$-$proton ($\gamma^* p$) cross sections on $Q^2$, $W$ and the momentum transfer squared to the proton ($t$), and, for the $\rho$, the dependence on the polar decay angle ($\cos \theta^*$), are presented. The $J/\Psi$ : $\rh0$ cross section ratio is determined. The results are discussed in the light of theoretical models and of the interplay of hard and soft physics processes.

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