Document Type
Article
Publication Date
10-8-1998
Abstract
The photoproduction reaction γp → μ+ μ-p has been studied in ep interactions using the ZEUS detector at HERA. The data sample corresponds to an integrated luminosity of 43.2pb-1. The Υ meson has been observed in photoproduction for the first time. The sum of the products of the elastic Υ(1S), Υ(2S),Υ(3S) photoproduction cross sections with their respective branching ratios is determined to be 13.3 ± 6.0(stat.)-2.3+2.7(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. © 1998 Elsevier Science B.V. All rights reserved.
Journal Title
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume
437
Issue
3-4
First Page
432
Last Page
444
DOI
https://doi.org/10.1016/S0370-2693(98)01081-8
First Department
Physics
Recommended Citation
Breitweg, J.; Derrick, M.; Krakauer, D.; Magill, S.; Mikunas, D.; Musgrave, B.; Repond, J.; Stanek, R.; Talaga, R. L.; Yoshida, R.; Zhang, H.; Mattingly, Margarita C. K.; Anselmo, F.; Antonioli, P.; Bari, G.; Basile, M.; Bellagamba, L.; Boscherini, D.; Bruni, A.; Bruni, G.; Cara Romeo, G.; Castellini, G.; Cifarelli, L.; Cindolo, F.; Contin, A.; Coppola, N.; Corradi, M.; De Pasquale, S.; Giusti, P.; Iacobucci, G.; and Laurenti, G., "Measurement of Elastic Υ Photoproduction at HERA" (1998). Faculty Publications. 2670.
https://digitalcommons.andrews.edu/pubs/2670
Acknowledgements
Accepted version retrieved July 19, 2021 from https://arxiv.org/pdf/hep-ex/9807020.pdf