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Charm in Dijet Photoproduction at HERA

Sutton, Mark Robert; (1998) Charm in Dijet Photoproduction at HERA. Doctoral thesis (Ph.D), UCL (University College London). Green open access

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Abstract

The production of charm in dijet photoproduction events at HERA has been studied. Charm production from the interaction of low virtuality photons is sensitive to both the charm and gluon densities within the photon, while the observation of jets with high transverse energy enables the study of the hard sub-process kinematics directly. Jets are found using the KT algorithm, while charm is tagged by identifying tracks from the decay of D*(2010) mesons via the D*+ D0+ (K-+) + and charge conjugate channels. The differential cross-section do(ep - D* + dijets +X)/dxOBS where xyOBS is the fraction of the photon energy contributing to the two jets with highest transverse energy, is presented for events with ET (jet 1,2) > 7,6GeV and PT(D*) > 3GeV. A significant contribution to the cross-section from resolved (xyOBS <0.75) processes is observed. Comparison with Leading order QCD Monte Carlo indicate that greater than 90% of the resolved cross-section results from events where the charm is produced within the photon. A preliminary NLO calculation using the massive scheme of Frixione et al lies below the data.

Type: Thesis (Doctoral)
Qualification: Ph.D
Title: Charm in Dijet Photoproduction at HERA
Open access status: An open access version is available from UCL Discovery
Language: English
Additional information: Thesis digitised by ProQuest.
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/33293
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