Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2007-06-26
Phys.Rev.D76:072011,2007
Physics
High Energy Physics
High Energy Physics - Experiment
36 pages, 13 figures, 20 tables, including minor revisions from referees. Accepted by Phys. Rev. D
Scientific paper
10.1103/PhysRevD.76.072011
The cross section for high-E_T dijet production in photoproduction has been measured with the ZEUS detector at HERA using an integrated luminosity of 81.8 pb-1. The events were required to have a virtuality of the incoming photon, Q^2, of less than 1 GeV^2 and a photon-proton centre-of-mass energy in the range 142 < W < 293 GeV. Events were selected if at least two jets satisfied the transverse-energy requirements of E_T(jet1) > 20 GeV and E_T(jet2) > 15 GeV and pseudorapidity requirements of -1 < eta(jet1,2) < 3, with at least one of the jets satisfying -1 < eta(jet) < 2.5. The measurements show sensitivity to the parton distributions in the photon and proton and effects beyond next-to-leading order in QCD. Hence these data can be used to constrain further the parton densities in the proton and photon.
Chekanov S.
ZEUS Collaboration
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