München 2009 – scientific programme

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T: Fachverband Teilchenphysik

T 74: Andere Gebiete der Experimentellen Teilchenphysik 2

T 74.4: Talk

Tuesday, March 10, 2009, 17:35–17:50, A022

Electron isolation at ATLAS — Ralf Bernhard, Jochen Hartert, and •Inga Ludwig — Albert-Ludwigs-Universität Freiburg

The ATLAS experiment at the Large Hadron Collider (LHC) will face the challenge of efficiently selecting interesting candidate events in pp collisions at 14 TeV centre-of-mass energy, whilst rejecting the enormous number of background events. Many of these interesting candidate events have isolated leptons in the final state, like for example events with a gauge boson or SUSY. On top of the standard ATLAS electron identification an isolation criterion has been developed using a likelihood as multivariate approach with several discriminating variables. The likelihood is constructed by selecting electrons from Z decays for the signal and for the background electrons from b quark jets. Results for the example of the associated Higgs boson production with top quarks and subsequent decay into a pair of W bosons are presented. In addition first results of a likelihood to discriminate against jets are given and a possible extension for muons is discussed.