Sensitivity of the ATLAS Experiment to discover the Decay H → ττ → ll + 4ν of the Standard Model Higgs Boson produced in Vector Boson Fusion [Elektronische Ressource] / Martin Schmitz

Sensitivity of the ATLAS Experiment to discoverthe Decay H! ! ‘‘+4of the Standard Model Higgs Boson produced inVector Boson FusionDissertationzurErlangung des Doktorgrades (Dr. rer. nat.)derMathematisch-Naturwissenschaftlichen Fakult atderRheinischen Friedrich-Wilhelms-Universit at Bonnvorgelegt vonMartin SchmitzausBonnBonn 2011Angefertigt mit Genehmigung der Mathematisch-Naturwissenschaftlichen Fakult at derRheinischen Friedrich-Wilhelms-Universit at Bonn1. Gutachter: Prof. Dr. Markus Schumacher2.hter: Prof. Dr. Norbert WermesTag der Promotion: 17.05.2011Erscheinungsjahr: 2011AbstractA study of the expected sensitivity of the ATLAS experiment to discover the StandardModel Higgs boson produced via vector boson fusion (VBF) and its decay to H ! !‘‘+4 is presented. The study is based on simulated proton-proton collisions at a centre-of-mass energy of 14TeV. For the rst time the discovery potential is evaluated in thepresence of additional proton-proton interactions (pile-up) to the process of interest in acompleteandconsistentway. Specialemphasisisplacedonthedevelopmentofbackgroundestimation techniques to extract the main background processesZ! andtt productionusing data. The tt background is estimated using a control sample selected with the VBFanalysis cuts and the inverted b-jet veto. The dominant background process Z ! is estimated using Z ! events. Replacing the muons of the Z ! event withsimulated -leptons, Z !