Measurement of the top quark pair production cross section with the ATLAS detector at LHC in pp collisions at √s =7 TeV in dilepton final states
Measurement of the top quark pair production cross section with the ATLAS detector at LHC in pp collisions at √s =7 TeV in dilepton final states
dc.contributor.advisor | Cristinziani, Markus | |
dc.contributor.author | Abajyan, Tatevik | |
dc.date.accessioned | 2020-04-17T21:20:11Z | |
dc.date.available | 2020-04-17T21:20:11Z | |
dc.date.issued | 04.06.2012 | |
dc.identifier.uri | https://hdl.handle.net/20.500.11811/5297 | |
dc.description.abstract | The production cross section of top quark pairs in proton-proton collisions at center-of-mass energy of 7 TeV recorded with the ATLAS detector at the CERN Large Hadron Collider is measured. The goal of the analysis is to provide a benchmark test of perturbative QCD and the Standard Model by measuring the tt production cross section in data and compare the measurement with theoretical predictions. Within the Standard Model, a top quark almost exclusively decays to a W-boson and a b-quark. Using a data sample of 35 pb-1, candidate events are selected in the dilepton topology (where both W-bosons from tt decay leptonically) with large missing transverse energy and at least two jets. The branching ratio of this process is 6.5%. The theoretical expectation for tt production cross section in proton-proton collisions at center-of-mass energy of 7 TeV is 165+11 -16 pb. Backgrounds from Z/γ* → ll and mis-identified leptons are estimated from data. Results include detailed studies of systematic uncertainties. A tt production cross section 181 ± 22(stat.) ± 14(syst.)+8 -7(lumi) pb is measured for an assumed top quark mass of 172.5 GeV. | |
dc.language.iso | eng | |
dc.rights | In Copyright | |
dc.rights.uri | http://rightsstatements.org/vocab/InC/1.0/ | |
dc.subject | Reperfusion injury | |
dc.subject | Endothelial cells | |
dc.subject | Cardiomyozytes | |
dc.subject | Mitochondria | |
dc.subject | Nitric oxide | |
dc.subject | HIF1α | |
dc.subject.ddc | 530 Physik | |
dc.title | Measurement of the top quark pair production cross section with the ATLAS detector at LHC in pp collisions at √s =7 TeV in dilepton final states | |
dc.type | Dissertation oder Habilitation | |
dc.publisher.name | Universitäts- und Landesbibliothek Bonn | |
dc.publisher.location | Bonn | |
dc.rights.accessRights | openAccess | |
dc.identifier.urn | https://nbn-resolving.org/urn:nbn:de:hbz:5n-28174 | |
ulbbn.pubtype | Erstveröffentlichung | |
ulbbnediss.affiliation.name | Rheinische Friedrich-Wilhelms-Universität Bonn | |
ulbbnediss.affiliation.location | Bonn | |
ulbbnediss.thesis.level | Dissertation | |
ulbbnediss.dissID | 2817 | |
ulbbnediss.date.accepted | 23.03.2012 | |
ulbbnediss.fakultaet | Mathematisch-Naturwissenschaftliche Fakultät | |
dc.contributor.coReferee | Wermes, Norbert |
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