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Publication Detail
Observation of isolated high-ET photons in photoproduction at HERA: ZEUS collaboration
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Publication Type:Journal article
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Publication Sub Type:Journal Article
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Authors:Breitweg J, Derrick M, Krakauer D, Magill S, Mikunas D, Musgrave B, Repond J, Stanek R, Talaga RL, Yoshida R, Zhang H, Mattingly MCK, 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, Corradi M, de Pasquale S, Gialas I, Giusti P, Iacobucci G, Laurenti G, Levi G, Margotti A, Massam T, Nania R, Palmonari F, Pesci A, Polini A, Ricci F, Sartorelli G, Zamora Garcia Y, Zichichi A, Amelung C, Bornheim A, Brock I, Coböken K, Crittenden J, Deffner R, Eckert M, Grothe M, Hartmann H, Heinloth K, Heinz L, Hilger E, Jakob HP, Katz UF, Kerger R, Paul E, Pfeiffer M, Rembser C, Stamm J, Wedemeyer R, Wieber H, Bailey DS, Campbell-Robson S, Cottingham WN, Foster B, Hall-Wilton R, Hayes ME, Heath GP, Heath HF, Piccioni D, Roff DG, Tapper RJ, Arneodo M, Ayad R, Capua M, Garfagnini A, Iannotti L, Schioppa M, Susinno G, Kim JY, Lee JH, Lim IT, Pac MY, Caldwell A, Cartiglia N, Jing Z, Liu W, Mellado B, Parsons JA, Ritz S, Sampson S, Sciulli F, Straub PB, Zhu Q, Borzemski P, Chwastowski J, Eskreys A, Jakubowski Z
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Publication date:06/11/1997
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Pagination:201, 216
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Journal:Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
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Volume:413
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Issue:1-2
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Status:Published
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Print ISSN:0370-2693
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.
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