Evidence for the Higgs Boson Decay to t+t- in the Lepton + Hadrons Final State with ATLAS
Evidence for the Higgs Boson Decay to t+t- in the Lepton + Hadrons Final State with ATLAS
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dc.contributor.advisor | Wermes, Norbert | |
dc.contributor.author | Schwindt, Thomas | |
dc.date.accessioned | 2020-04-20T20:45:02Z | |
dc.date.available | 2020-04-20T20:45:02Z | |
dc.date.issued | 12.03.2015 | |
dc.identifier.uri | https://hdl.handle.net/20.500.11811/6428 | |
dc.description.abstract | The data recorded with the ATLAS experiment during the first run period of the Large Hadron Collider are analysed by selecting final states with two τ-leptons, which further decay to a lighter lepton and to hadrons, respectively. The modelling of these final states is first validated in the context of the Z boson production cross section in ττ final states. The event selection and the data-driven techniques for the estimation of important background processes are then adapted to a search for H→ττ decays of the Higgs boson. In this search, Z→ττ final states contribute the dominant background and are therefore modelled in a data-driven way by replacing the Z decay products in Z→μμ data events with simulated decays of τ-leptons. Including all different background estimates, the search strategy is developed, and its sensitivity is documented in two intermediate results. With the final multi-variate analysis employing boosted decision trees, an excess of data over the estimated background in lepton + hadrons final states is observed with a statistical significance of 3.2$sigma$. It is compatible with a mass of mHapprox125 GeV, which has been measured in other final states originating from bosonic decays. This result is evidence for the Yukawa coupling of the Higgs boson to μ-leptons. | |
dc.language.iso | eng | |
dc.rights | In Copyright | |
dc.rights.uri | http://rightsstatements.org/vocab/InC/1.0/ | |
dc.subject | LHC | |
dc.subject | BEH | |
dc.subject | Tau | |
dc.subject | Fermion | |
dc.subject | Yukawa | |
dc.subject.ddc | 530 Physik | |
dc.title | Evidence for the Higgs Boson Decay to t+t- in the Lepton + Hadrons Final State with ATLAS | |
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-39294 | |
ulbbn.pubtype | Erstveröffentlichung | |
ulbbnediss.affiliation.name | Rheinische Friedrich-Wilhelms-Universität Bonn | |
ulbbnediss.affiliation.location | Bonn | |
ulbbnediss.thesis.level | Dissertation | |
ulbbnediss.dissID | 3929 | |
ulbbnediss.date.accepted | 05.02.2015 | |
ulbbnediss.institute | Mathematisch-Naturwissenschaftliche Fakultät : Fachgruppe Physik/Astronomie / Physikalisches Institut (PI) | |
ulbbnediss.fakultaet | Mathematisch-Naturwissenschaftliche Fakultät | |
dc.contributor.coReferee | Desch, Klaus |
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