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.author David, Claire
dc.date.accessioned 2016-05-02T18:53:10Z
dc.date.available 2016-05-02T18:53:10Z
dc.date.copyright 2016 en_US
dc.date.issued 2016-05-02
dc.identifier.uri http://hdl.handle.net/1828/7254
dc.description.abstract The 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.language English eng
dc.language.iso en en_US
dc.rights Available to the World Wide Web en_US
dc.rights.uri http://creativecommons.org/licenses/by/2.5/ca/ *
dc.subject Particle physics en_US
dc.subject Supersymmetry en_US
dc.subject ATLAS detector en_US
dc.subject Large Hadron Collider en_US
dc.subject LHC en_US
dc.subject Experimental High Energy Physics en_US
dc.subject Data analysis en_US
dc.subject 8 TeV en_US
dc.subject proton-proton collisions en_US
dc.subject Higgs boson en_US
dc.subject Neutralino en_US
dc.subject Chargino en_US
dc.title Search for supersymmetry using a Higgs boson in the decay cascade with the ATLAS detector at the Large Hadron Collider en_US
dc.type Thesis en_US
dc.contributor.supervisor Lefebvre, Michel
dc.contributor.supervisor McPherson, Robert A. (Robert Anthony)
dc.degree.department Department of Physics and Astronomy en_US
dc.degree.level Doctor of Philosophy Ph.D. en_US
dc.identifier.bibliographicCitation ATLAS 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.bibliographicCitation ATLAS 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.description.scholarlevel Graduate en_US
dc.description.proquestcode 0798 en_US

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