Elastic J/psi production at HERA
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- Wissing, C.
- Wolf, R.
- Wuensch, E.
- Xella, S.
- Yan, W.
- Yeganov, V.
- Zacek, J.
- Zalesak, J.
- Zhang, Z.
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- Zomer, F.
Publication date
January 2006
DOI Publisher
Springer Science and Business Media LLCAbstract
Cross sections for elastic production of J/psi mesons in photoproduction and electroproduction are measured in electron proton collisions at HERA using an integrated luminosity of 55 pb(-1). Results are presented for photon virtualities Q(2) up to 80 GeV2. The dependence on the photon-proton centre of mass energy W-gamma p is analysed in the range 40 <= W-gamma p <= 305 GeV in photoproduction and 40 <= W-gamma p <= 160 GeV in electroproduction. The W-gamma p dependences of the cross sections do not change significantly with Q(2) and can be described by models based on perturbative QCD. Within such models, the data show a high sensitivity to the gluon density of the proton in the domain of low Bjorken x and low Q(2). Differential cross secti...
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