Measurement of Elastic $Υ$ Photoproduction at HERA

Details Measurement of Elastic $Υ$ Photoproduction at HERA Measurement of Elastic $Υ$ Photoproduction at HERA

1998-07-20

arxiv.org/abs/hep-ex/9807020v1

Phys.Lett.B437:432-444,1998

Physics

High Energy Physics

High Energy Physics - Experiment

13 pages including 3 figures

Scientific paper

10.1016/S0370-2693(98)01081-8

The photoproduction reaction gamma p -> mu+ mu- p has been studied in ep interactions using the ZEUS detector at HERA. The data sample corresponds to an integrated luminosity of 43.2 pb^{-1}. The Upsilon meson has been observed in photoproduction for the first time. The sum of the products of the elastic Upsilon(1S), Upsilon(2S), Upsilon(3S) photoproduction cross sections with their respective branching ratios is determined to be 13.3 +- 6.0(stat.)^{+2.7}_{-2.3}(syst.) pb at a mean photon-proton centre of mass energy of 120 GeV. The cross section is above the prediction of a perturbative QCD model.

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