Supersymmetry searches in the single lepton final state with the ATLAS detector [Elektronische Ressource] / Keith Morgan Edmonds

Supersymmetry Searches in the Single Lepton Final State withthe ATLAS DetectorbyKeith Morgan EdmondsA Thesis Submitted in Partial Fullfillment of theRequirements for the Degree ofDOCTOR RERUM NATURALIUMin the Department of PhysicsKeith Morgan Edmonds, 2011Johannes Gutenberg - Universit¨at MainziiiiiAbstractThis thesis presents an analysis for the search of Supersymmetry with the ATLASdetector at the LHC. The final state with one lepton, several coloured particles and largemissingtransverseenergywaschosen. Particularemphasiswasplacedontheoptimizationof the requirements for lepton identification. This optimization showed to be particularlyuseful when combining with multi-lepton selections. The systematic error associatedwiththehigherorderQCDdiagramsinMonteCarloproductionisgivenparticularfocus.Methodstoverifyandcorrecttheenergymeasurementofhadronicshowersaredeveloped.Methods for the identification and removal of mismeasurements caused by the detectorenvironment are applied. A new detector simulation system is shown to provide goodprospects for future fast Monte Carlo production. The analysis was performed for ≈−135 pb and no significant deviation from the Standard Model is seen. Exclusion limitsarefoundinthesinglemuonandfourjetssubchannelforminimalSupergravity. Previouslimits set by Tevatron and LEP are extended.ivTable of ContentsSupervisory Committee iAbstract iiiTable of Contents v1 Introduction 12 Particle Physics 32.1 The Standard Model . . . .