Measurement of Di-jet Cross-Sections in Photoproduction and Photon Structure
Abstract
The production of hard di-jet events in photoproduction at HERA is dominated by resolved photon processes in which a parton in the photon with momentum fraction xgamma is scattered from a parton in the proton. These processes are sensitive to the quark and gluon content of the photon. The differential di-jet cross-section dsigma/dlog(xgamma) is presented here, measured in tagged photoproduction at HERA using data taken with the H1 detector, corresponding to an integrated luminosity of 7.2 pb(-1). Using a restricted data sample at high transverse jet energy, E(T,jet)>6 GeV, the effective parton density fgamma,eff(xgamma) = [q(xgamma) + bar(q)(xgamma) +9/4g(xgamma)] in the photon in leading order QCD is measured down to xgamma=0.05 from which the gluon density in the photon is derived.
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