Measurement of the inclusive di-jet cross section in photoproduction and determination of an effective parton distribution in the photon

摘要

The double-differential inclusive di-jet cross section in photoproduction processes is measured with the H1 detector at HERA. The cross section is determined as a function of the average transverse jet energyETjets for ranges of the fractional energyξγjets of the parton from the photon side. An effective leading order parton distribution in the photon is determined at large parton fractional energies for scale between 80 T2 < 1250 GeV2. The measurement is compatible with the logarithmic scale dependence that is predicted by perturbative QCD.