Di-Jet Production in Photon-Photon colisions at sqrt(s)ee from 189 to 209 GeV

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dc.creatorThe OPAL collaboration
dc.creatorAbbiendi, G.
dc.date2003-01-10
dc.date.accessioned2026-07-07T11:46:37Z
dc.date.available2026-07-07T11:46:37Z
dc.descriptionDi-jet producion is studied in collisions of quasi-real photons at e+e- centre- of-mass energies sqrt(s)ee from 189 to 209 GeV at LEP. The data were collected with the OPAL detector. Jets are reconstructed using an inclusive k_t clustering algorithm for all cross-section measurements presented. A cone jet algorithm is used in addition to study the different structure of the jets resulting from either of the algorithms. The inclusive di-jet cross-section is measured as a function of the mean transverse energy Etm(jet) of the two leading jets, and as a functiuon of the estimated fraction of the photon momentum carried by the parton entering the hard sub-process, xg, for different regions of Etm (jet). Angular distribution in di-jet events are measured and used to demonstrate the dominance of quark and gluon initiated processes in different regions of phase space. Furthermore the inclusive di-jet cross-section as a function of |eta(jet)| and |delta eta (jet)| is presented where eta(jet) is the jet pseudo-rapidity. Different regions of the xg+ -xg- -space are explored to study and control the influence of an underlying event. The results are compared to next-to-leading order perturbative QCD calculations and to the predictions of the leading order Monte Carlo generator PYTHIA.
dc.description45 pages, 16 figures
dc.identifierhttps://arxiv.org/abs/hep-ex/0301013
dc.identifierhttp://arxiv.org/abs/hep-ex/0301013
dc.identifierEur.Phys.J.C31:307-325,2003
dc.identifierdoi:10.1140/epjc/s2003-01360-8
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/202289
dc.subjectHigh Energy Physics - Experiment
dc.titleDi-Jet Production in Photon-Photon colisions at sqrt(s)ee from 189 to 209 GeV
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