Exclusive photoproduction of {\bf $\Upsilon$} mesons at HERA
ZEUS Collaboration
TL;DR
This paper reports on the measurement of exclusive Upsilon meson photoproduction at HERA, analyzing the full ZEUS data sample within specific energy and virtuality ranges, and comparing results to perturbative QCD predictions.
Contribution
It provides the first comprehensive analysis of Upsilon photoproduction at HERA using the full ZEUS dataset, extending the kinematic range and testing QCD models.
Findings
Measured cross sections for gamma p --> Upsilon p
Results are consistent with perturbative QCD predictions
Extended the kinematic range of previous studies
Abstract
The exclusive photoproduction reaction gamma p --> Upsilon p has been studied with the ZEUS experiment in ep collisions at HERA using an integrated luminosity of 468 pb^{-1}. The measurement covers the kinematic range 60<W<220 GeV and Q^2<1 GeV^2, where W is the photon-proton centre-of-mass energy and Q^2 is the photon virtuality. These results, which represent the analysis of the full ZEUS data sample for this channel, are compared to predictions based on perturbative QCD.
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