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Publication Detail
Measurement of elastic J/ψ photoproduction at HERA
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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, Sartorelli G, Zamora Garcia Y, Zichichi A, Amelung C, Bornheim A, Brock I, Coböken K, Crittenden J, Deffner R, Eckert M, Feld L, Grothe M, Hartmann H, Heinloth K, Heinz L, Hilger E, Jakob HP, Katz UF, Paul E, Pfeiffer M, Rembser C, Stamm J, Wedemeyer R, 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, Parsons JA, Ritz S, Sampson S, Sciulli F, Straub PB, Zhu Q, Borzemski P, Chwastowski J, Eskreys A, Jakubowski Z, Przybycień MB, Zachara M, Zawiejski L
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Publication date:01/06/1997
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Pagination:215, 228
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Journal:Zeitschrift fur Physik C-Particles and Fields
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Volume:75
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Issue:2
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Status:Published
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Print ISSN:0170-9739
Abstract
The reaction γ p → J/ψ p has been studied in ep interactions using the ZEUS detector at HERA. The cross section for elastic J/ψ photoproduction has been measured as a function of the photon-proton centre of mass energy W in the range 40 < W < 140 GeV at a median photon virtuality Q2 of 5 × 10-5 GeV2. The photoproduction cross section, σγp→J/ψp, is observed to rise steeply with W. A fit to the data presented in this paper to determine the parameter δ in the form σγp→J/ψp α Wδ yields the value δ = 0.92±0.14±0.10. The differential cross section dσ/d|t| is presented over the range |t| < 1.0 GeV2 where t is the square of the four-momentum exchanged at the proton vertex. dσ/d|t| falls exponentially with a slope parameter of 4.6 ± 0.4-0.6+0.4 GeV-2. The measured decay angular distributions are consistent with s-channel helicity conservation. © Springer-Verlag 1997.
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