Study of top-quark pair cross-section measurement in the dilepton channel with the ATLAS detector at the LHC [Elektronische Ressource] / Duc Bao Ta. Mathematisch-Naturwissenschaftliche Fakultät

Study of top-quark paircross-section measurement in thedilepton channel with the ATLASdetector at the LHCDissertationzurErlangung des Doktorgrades (Dr. rer. nat.)derMathematisch-Naturwissenschaftlichen Fakult¨atderRheinischen Friedrich-Wilhelms-Universit¨at Bonnvorgelegt vonDuc Bao TaausHaiphongBonn, Oktober 2010Angefertigt mit Genehmigung derMathematisch-Naturwissenschaftlichen Fakult¨atder Rheinischen Friedrich-Wilhelms-Universit¨atBonn1. Referent: Prof. Dr. Norbert Wermes2. Referent: Prof. Dr. Ian BrockTag der Promotion: 28. Oktober 2010Erscheinungsjahr: 2011AbstractThe top quark is the heaviest of the known fundamental particles in the StandardModel(SM)with amassof173.3±1.1GeV. It isthe sixth quarkintheSMandtheweakisospinpartnerofthebottomquark. Propertiessuchasthemassandthecrosssection have been measured since its discovery in 1995 with great precision at theproton-antiproton Fermilab Tevatron Collider, Chicago at a centre-of-mass energyof 1.8GeV and 1.96GeV. With the start of the proton-protonCERN Large HadronCollider (LHC), Geneva, a new record in the centre-of-mass energy was achieved.TheLHC opens anewenergy frontier and probestheSMatenergies ofthe electro-weak symmetry-breaking scale andbeyond.