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Measurements of Di-Jet Cross Sections in γγ → hadrons with ALEPH

By P. Hodgson, M. Lehto and B. Pötter

Abstract

. Measurements of di-jet cross sections in anti-tagged and single-tagged events have been performed. For the anti-tagged case the KTCLUS jet algorithm was used and the data corrected back to hadron level using the PHOJET and PYTHIA Monte Carlo models. In the single-tagged case a cone based jet algorithm was used together with the HERWIG Monte Carlo. In both studies good agreement between NLO calculations and the data was found. INTRODUCTION The study of di-jet production in photon photon collisions can be used to examine the structure of the photon and test QCD predictions. In the analyses presented here two distinct tagging modes are used: single-tagged, where one of the scattered electrons is observed, corresponding to the probing of a nearly real photon by a virtual photon, and untagged, where events with a scattered electron are explicitly excluded and thus both photons are real. Both analyses were based on data taken with the ALEPH [1] detector at p s = 183 GeV with an..

Year: 2007
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