Dijet angular distributions in photoproduction of charm at HERA

Details Dijet angular distributions in photoproduction of charm at HERA Dijet angular distributions in photoproduction of charm at HERA

2003-02-19

arxiv.org/abs/hep-ex/0302025v2

Phys.Lett.B565:87-101,2003

Physics

High Energy Physics

High Energy Physics - Experiment

21 pages, 4 tables, 5 figures

Scientific paper

10.1016/S0370-2693(03)00752-4

Dijet angular distributions of photoproduction events in which a $D^{*\pm}$ meson is produced in association with one of two energetic jets have been measured with the ZEUS detector at HERA, using an integrated luminosity of 120 pb$^{-1}$. Differential cross sections as a function of the angle between the charm-jet and the proton-beam direction in the dijet rest frame have been measured for samples enriched in direct or resolved photon events. The results are compared with predictions from leading-order parton-shower Monte Carlo models and with next-to-leading-order QCD calculations. The angular distributions show clear evidence for the existence of charm originating from the photon.

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