Article
Observation of Isolated High-ET Photons in Photoproduction at HERA: ZEUS Collaboration
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Document Type
Article
Publication Date
11-6-1997
Disciplines
Abstract
Events containing an isolated prompt photon with high transverse energy, together with a balancing jet, have been observed for the first time in photoproduction at HERA. The data were taken with the ZEUS detector, in a γp centre of mass energy range 120-250 GeV. The fraction of the incoming photon energy participating in the production of the prompt photon and the jet, xγ, shows a strong peak near unity, consistent with LO QCD Monte Carlo predictions. In the transverse energy and pseudorapidity range 5 ≤ EγT < 10 GeV, -0.7 ≤ ηγ < 0.8, EjetT ≥ 5 GeV, and -1.5 ≤ ηjet ≤ 1.8, with xOBSγ > 0.8, the measured cross section is 15.3 ± 3.8 ± 1.8 pb, in good agreement with a recent NLO calculation. © 1997 Elsevier Science B.V.
DOI
https://doi.org/10.1016/S0370-2693(97)01164-7
First Department
Physics
Acknowledgements
Accepted version retrieved July 19, 2021 from https://arxiv.org/pdf/hep-ex/9708038.pdf
Citation Information
J. Breitweg, M. Derrick, D. Krakauer, S. Magill, et al.. "Observation of Isolated High-ET Photons in Photoproduction at HERA: ZEUS Collaboration" Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics Vol. 413 Iss. 1-2 (1997) p. 201 - 216 Available at: http://works.bepress.com/margarita_mattingly/168/