Search for Supersymmetry in final states with jets, missing transverse momentum and at least one τ lepton with the ATLAS Experiment
Search for Supersymmetry in final states with jets, missing transverse momentum and at least one τ lepton with the ATLAS Experiment
dc.contributor.advisor | Dingfelder, Jochen Christian | |
dc.contributor.author | Janus, Michel | |
dc.date.accessioned | 2020-04-18T21:59:02Z | |
dc.date.available | 2020-04-18T21:59:02Z | |
dc.date.issued | 12.07.2013 | |
dc.identifier.uri | https://hdl.handle.net/20.500.11811/5718 | |
dc.description.abstract | The first search for Supersymmetry (SUSY) in final states with at least one τ lepton, two or more jets and large missing transverse energy based on proton-proton collisions recorded with the ATLAS detector at the LHC is presented. The τ leptons are reconstructed in the hadronic decay mode. To search for new physics in final states with hadronic τ-lepton decays a reliable and efficient reconstruction algorithm for hadronic τ decays is needed. As part of this thesis two existing τ-reconstruction algorithms were further developed and integrated into a single algorithm that has by now become the standard algorithm for τ reconstruction in ATLAS. The suppression of jet background, one of the crucial aspects of τ reconstruction and the SUSY analysis in this thesis, was studied and the probabilities of misidentifying quark- or gluon-initiated jets as hadronic τ-lepton decays were measured in both the 2010 and 2011 ATLAS data at a centre-of-mass energy of √s = 7 TeV, using samples of di-jet events. The ATLAS data used for the SUSY search in this thesis was recorded between March and August 2011 and corresponds to an integrated luminosity of 2.05 fb-1 . Eleven events are observed in data, consistent with the total Standard Model background expectation of 13.2 ± 4.2 events. As no excess of data over the expected backgrounds is observed, 95% confidence level limits are set within the framework of gauge mediated SUSY breaking (GMSB) models as a function of the GMSB parameters Λ and tan β, for fixed values of the other GMSB parameters: Mmess = 250 TeV, N5 = 3, sign(µ) = + and Cgrav = 1. In addition to the GMSB interpretation, a model-independent upper limit of 8.5 on the number of events from potential non-Standard Model sources is derived at the 95% confidence level. | |
dc.language.iso | eng | |
dc.rights | In Copyright | |
dc.rights.uri | http://rightsstatements.org/vocab/InC/1.0/ | |
dc.subject.ddc | 530 Physik | |
dc.title | Search for Supersymmetry in final states with jets, missing transverse momentum and at least one τ lepton with the ATLAS Experiment | |
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-32779 | |
ulbbn.pubtype | Erstveröffentlichung | |
ulbbnediss.affiliation.name | Rheinische Friedrich-Wilhelms-Universität Bonn | |
ulbbnediss.affiliation.location | Bonn | |
ulbbnediss.thesis.level | Dissertation | |
ulbbnediss.dissID | 3277 | |
ulbbnediss.date.accepted | 13.12.2012 | |
ulbbnediss.fakultaet | Mathematisch-Naturwissenschaftliche Fakultät | |
dc.contributor.coReferee | Desch, Klaus |
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