Search for supersymmetry using a Higgs boson in the decay cascade with the ATLAS detector at the Large Hadron Collider

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dc.contributor.authorDavid, Claire
dc.contributor.supervisorLefebvre, Michel
dc.contributor.supervisorMcPherson, Robert A. (Robert Anthony)
dc.date.accessioned2016-05-02T18:53:10Z
dc.date.available2016-05-02T18:53:10Z
dc.date.copyright2016en_US
dc.date.issued2016-05-02
dc.degree.departmentDepartment of Physics and Astronomyen_US
dc.degree.levelDoctor of Philosophy Ph.D.en_US
dc.description.abstractThe Standard Model of particle physics is a successful theory, yet it is incomplete. Supersymmetry is one of the favoured extensions of the Standard Model, elegantly addressing several unresolved issues. This thesis presents a search for the pair production of supersymmetric particles chargino one and neutralino two, where the neutralino two decays to the lightest neutralino and the 125 GeV Higgs boson. The final states considered for the search have large missing transverse momentum, an isolated lepton and two jets identified as originating from bottom quarks. The analysis is based on 20.3 inverse femtobarns of 8 TeV proton-proton collision data delivered by the Large Hadron Collider and recorded with the ATLAS detector. No excess over Standard Model predictions is observed. The analysis has been combined with three independent searches that probe other decay modes of the Standard Model Higgs boson. Limits are set at 95% confidence level in the context of a simplified supersymmetric model. Common masses of chargino one and neutralino two are excluded up to 250 GeV for a massless neutralino one. The analysis of this dissertation has been reinterpreted in the context of a large scan of the phenomenological Minimal Supersymmetric Standard Model, along with 22 other ATLAS Run 1 searches. The resulting summary paper represents the most comprehensive assessment of the ATLAS constraints on Supersymmetry models to date.en_US
dc.description.proquestcode0798en_US
dc.description.proquestemailcdavid@uvic.caen_US
dc.description.scholarlevelGraduateen_US
dc.identifier.bibliographicCitationATLAS Collaboration, Search for direct pair production of a chargino and a neutralino decaying to the 125 GeV Higgs boson in 8 TeV pp collisions with the ATLAS detector," Eur.Phys.J., vol. C 75, no. 5, p. 208, 2015.en_US
dc.identifier.bibliographicCitationATLAS Collaboration, Summary of the ATLAS experiment's sensitivity to supersymmetry after LHC Run 1 interpreted in the phenomenological MSSM," JHEP, vol. 10, p. 134, 2015.en_US
dc.identifier.urihttp://hdl.handle.net/1828/7254
dc.languageEnglisheng
dc.language.isoenen_US
dc.rightsAvailable to the World Wide Weben_US
dc.rights.urihttp://creativecommons.org/licenses/by/2.5/ca/*
dc.subjectParticle physicsen_US
dc.subjectSupersymmetryen_US
dc.subjectATLAS detectoren_US
dc.subjectLarge Hadron Collideren_US
dc.subjectLHCen_US
dc.subjectExperimental High Energy Physicsen_US
dc.subjectData analysisen_US
dc.subject8 TeVen_US
dc.subjectproton-proton collisionsen_US
dc.subjectHiggs bosonen_US
dc.subjectNeutralinoen_US
dc.subjectCharginoen_US
dc.titleSearch for supersymmetry using a Higgs boson in the decay cascade with the ATLAS detector at the Large Hadron Collideren_US
dc.typeThesisen_US

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