Search for flavour-changing neutral current top-quark decays t -> qZ in proton-proton collisions at root s=13 TeV with the ATLAS detector

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dc.contributor.authorÇakır, Orhan
dc.contributor.authorYıldız, Hatice Duran
dc.contributor.departmentFen Fakültesitr_TR
dc.contributor.departmentHızlandırıcı Teknolojileri Enstitüsütr_TR
dc.date.accessioned2019-07-01T12:07:12Z
dc.date.available2019-07-01T12:07:12Z
dc.date.issued2018
dc.description.abstractA search for flavour-changing neutral-current processes in top-quark decays is presented. Data collected with the ATLAS detector from proton-proton collisions at the Large Hadron Collider at a centre-of-mass energy of root s = 13TeV, corresponding to an integrated luminosity of 36.1 fb(-1), are analysed. The search is performed using top-quark pair events, with one top quark decaying through the t -> qZ (q = u, c) flavour-changing neutral-current channel, and the other through the dominant Standard Model mode t -> bW. Only Z boson decays into charged leptons and leptonic W boson decays are considered as signal. Consequently, the final-state topology is characterized by the presence of three isolated charged leptons (electrons or muons), at least two jets, one of the jets originating from a b-quark, and missing transverse momentum from the undetected neutrino. The data are consistent with Standard Model background contributions, and at 95% confidence level the search sets observed (expected) upper limits of 1.7 x 10(-4) (2.4 x 10(-4)) on the t -> uZ branching ratio and 2.4 x 10(-4) (3.2 x 10(-4)) on the t -> cZ branching ratio, constituting the most stringent limits to date.tr_TR
dc.description.indexWos
dc.description.indexScopus
dc.description.indexwos
dc.identifier.endpage41tr_TR
dc.identifier.issue176tr_TR
dc.identifier.other10.1007/JHEP07(2018)176
dc.identifier.startpage01tr_TR
dc.identifier.urihttp://hdl.handle.net/20.500.12575/67063
dc.identifier.volume07tr_TR
dc.language.isoentr_TR
dc.relation.journalJournal of High Energy Physicstr_TR
dc.subject: Hadron-Hadron scattering (experiments)tr_TR
dc.titleSearch for flavour-changing neutral current top-quark decays t -> qZ in proton-proton collisions at root s=13 TeV with the ATLAS detectortr_TR
dc.typeArticletr_TR

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