Search for the associated production of charginos and neutralinos in proton antiproton collisions at √S=1.96 TeV with the DØ detector at the tevatron [Elektronische Ressource] / vorgelegt von Olav Michael Kåre Mundal. Universität Bonn, Physikalisches Institut

..UNIVERSITAT BONNPhysikalisches InstitutSearch for the Associated Productionof Charginos and Neutralinos pin Proton-Antiproton Collisions at s = 1.96 TeVwith the D Detector at the TevatronvonOlav Michael Kare MundalAbstract:A search for Supersymmetry is performed via the associated production of charginos andneutralinos in nal states consisting of three charged leptons and missing transverse energyusing data collected with the D detector at a center-of-mass energy of 1.96 TeV at the Fermilab1Tevatron Collider. The data sample corresponds to an integrated luminosity of 2.3 fb . This nal state is considered one of the most promising channels in the search for supersymmetricparticles because of its low Standard Model background. A dedicated event selection is developedand events with two muons plus an additional isolated track or events with two electrons plus anadditional isolated track are analyzed. The requirement of an isolated track replaces the thirdcharged lepton in the event. After all selection cuts are applied, in total 7 events are selected inthe data with an expected number of background events of 5.240.40 (stat)0.30 (syst). Dueto the good agreement of events observed in data with the expectation of the Standard Modelbackgrounds, no evidence for Supersymmetry is found. The present analyses are considered incombination with three other decay channels and limits on the production cross section timesleptonic branching fraction are set.