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Search for the H → b¯b decay mode of the Standard Model Higgs boson in associated production with a vector boson in proton-proton collisions at √s = 8 TeV with the ATLAS experiment

dc.contributor.advisorWermes, Norbert
dc.contributor.authorTherhaag, Jan
dc.date.accessioned2020-04-19T22:37:34Z
dc.date.available2020-04-19T22:37:34Z
dc.date.issued11.06.2014
dc.identifier.urihttp://hdl.handle.net/20.500.11811/6100
dc.description.abstractIn this thesis, a search for the H→b¯b decay mode of the Standard Model Higgs boson in associated production with a vector boson is presented. The search is based on the entire data-set recorded by the ATLAS experiment in 2012 amounting to 20.3fb-1 of data. A novel search strategy based on a machine learning approach using boosted decision trees and a variable set constructed from Lorentz invariant quantities is introduced.
No significant excess above the Standard Model background expectation is observed. For a Higgs boson mass of mH=125GeV, the expected upper limit on the Higgs boson production cross section assuming the absence of signal is 2.06×σSM, while the observed limit is 3.15×σSM. This excess corresponds to a local significance of 1.1 standard deviations. The ratio of the measured signal strength to the Standard Model expectation is μ=1.40±0.95.
dc.language.isoeng
dc.rightsIn Copyright
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectTeilchenphysik
dc.subjectHiggs
dc.subjectATLAS
dc.subjectHbb
dc.subjectmultivariate Methoden
dc.subjectparticle physics
dc.subjectassociated production
dc.subjectmultivariate analysis
dc.subjectTMVA
dc.subject.ddc530 Physik
dc.titleSearch for the H → b¯b decay mode of the Standard Model Higgs boson in associated production with a vector boson in proton-proton collisions at √s = 8 TeV with the ATLAS experiment
dc.typeDissertation oder Habilitation
dc.publisher.nameUniversitäts- und Landesbibliothek Bonn
dc.publisher.locationBonn
dc.rights.accessRightsopenAccess
dc.identifier.urnhttps://nbn-resolving.org/urn:nbn:de:hbz:5n-36319
ulbbn.pubtypeErstveröffentlichung
ulbbnediss.affiliation.nameRheinische Friedrich-Wilhelms-Universität Bonn
ulbbnediss.affiliation.locationBonn
ulbbnediss.thesis.levelDissertation
ulbbnediss.dissID3631
ulbbnediss.date.accepted14.03.2014
ulbbnediss.instituteMathematisch-Naturwissenschaftliche Fakultät : Fachgruppe Physik/Astronomie / Physikalisches Institut (PI)
ulbbnediss.fakultaetMathematisch-Naturwissenschaftliche Fakultät
dc.contributor.coRefereeDesch, Klaus


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