W → τντ Cross Section Measurement and Search for the Standard Model Higgs Boson in the τlep τhad Final State with the ATLAS Detector
W → τντ Cross Section Measurement and Search for the Standard Model Higgs Boson in the τlep τhad Final State with the ATLAS Detector
dc.contributor.advisor | Wermes, Norbert | |
dc.contributor.author | Kraus, Jana | |
dc.date.accessioned | 2020-04-20T21:06:22Z | |
dc.date.available | 2020-04-20T21:06:22Z | |
dc.date.issued | 13.03.2015 | |
dc.identifier.uri | https://hdl.handle.net/20.500.11811/6435 | |
dc.description.abstract | Two measurements based on proton-proton collisions recorded with the ATLAS experiment at the LHC with τ leptons and missing transverse energy in the final state are presented. The W boson production cross section with subsequent W → τντ decay is measured based on 2010 ATLAS data at a centre-of-mass energy of √s = 7 TeV corresponding to an integrated luminosity of 34 pb-1. The product of the W production cross section and branching ratio is measured to be σWtot X BR(W→ τντ) = (11.1 ± 0.3 (stat.) ± 1.7 (syst.) ± 0.4 (lumi.)) nb. This is the first measurement of the W→ τντ process at the LHC. It is one of the first analyses to successfully validate the reconstruction and identification techniques for hadronically decaying τ leptons and missing transverse energy. A search for the Standard Model Higgs boson decaying to a pair of τ leptons is performed with a leptonically and hadronically decaying τ lepton in the final state. The analysis is carried out on the full 2012 ATLAS data sample at a centre-of-mass energy of √s = 8 TeV corresponding to an integrated luminosity of 20.3 fb-1. The selection of data events is based on the kinematic properties of a Higgs boson produced via vector-boson fusion or a boosted Higgs boson resulting mainly from gluon fusion. A deviation from the predicted background is found in data with an observed (expected) significance of 1 (1.7) σ at mH = 125 GeV. The measured ratio of the signal strength to the Standard Model expectation is μ = 0.4 ± 0.6. In the combination of all H→ττ decay modes an excess in data over the predicted background with a significance of 3.2 (2.5) σ at mH =125 GeV is found with a relative signal strength of μ = 1.4+0.6-0.5. This result constitutes evidence that the recently discovered Higgs boson directly couples to fermions consistent with the expectation from the Standard Model. In particular the compatibility with a mass of mH = 125 GeV is confirmed with this analysis. | |
dc.language.iso | eng | |
dc.rights | In Copyright | |
dc.rights.uri | http://rightsstatements.org/vocab/InC/1.0/ | |
dc.subject | Teilchenphysik | |
dc.subject | LHC | |
dc.subject | CERN | |
dc.subject | Higgs-Boson | |
dc.subject | W Boson | |
dc.subject | Tau-Lepton | |
dc.subject | Particle physics | |
dc.subject.ddc | 530 Physik | |
dc.title | W → τντ Cross Section Measurement and Search for the Standard Model Higgs Boson in the τlep τhad Final State with the ATLAS Detector | |
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-39401 | |
ulbbn.pubtype | Erstveröffentlichung | |
ulbbnediss.affiliation.name | Rheinische Friedrich-Wilhelms-Universität Bonn | |
ulbbnediss.affiliation.location | Bonn | |
ulbbnediss.thesis.level | Dissertation | |
ulbbnediss.dissID | 3940 | |
ulbbnediss.date.accepted | 23.02.2015 | |
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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