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Elastic photoproduction of $J/\psi$ mesons at high W |
| Reference |
Preliminary results expected for ICHEP2004, Summer 2004 |
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| Contact |
Ludger Janauschek, Christian Kiesling |
| Abstract |
We present the analysis of elastic photoproduction of $J/\psi$ mesons over
the $W_{\gamma p}$ energy range larger than 135 GeV up to the kinematic
limit ("high W analysis"). The analysis uses data from the 2000 running
(Hera I) and selects events with two electrons in the final state,
which are detected in the central detector and/or in Spacal.
For the highest $W{\gamma p}$ energies ($>$ 235 GeV) both electrons
enter Spacal and the corresponding electron tracks are found in the
BST. Proton dissociation is tagged and removed using the forward
detectors. The total cross section for $\gamma p o J/\psi p$,
as a function of $W_{\gamma p}$ is presented. |
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