Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2001-12-19
Eur.Phys.J.C23:615-631,2002
Physics
High Energy Physics
High Energy Physics - Experiment
38 pages, 13 figures, to be submitted to Eur. Phys. J. C. Updated version, with the addition of a reference and two minor corr
Scientific paper
10.1007/s100520200936
The dijet cross section in photoproduction has been measured with the ZEUS detector at HERA using an integrated luminosity of 38.6 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 $134 < W_{\gamma p} < 277$ GeV. Each event contains at least two jets satisfying transverse-energy requirements of $E_{T}^{\rm jet1}>14$ GeV and $E_{T}^{\rm jet2}>11$ GeV and pseudorapidity requirements of $-1<\eta^{\rm jet1,2}<2.4$. The measurements are compared to next-to-leading-order QCD predictions. The data show particular sensitivity to the density of partons in the photon, allowing the validity of the current parameterisations to be tested.
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