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Search for flavour-changing neutral current top-quark decays to q Z in pp collision data collected with the ATLAS detector at root s=8 TeV
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0002-8913-0981
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Number of Authors: 2856
2016 (English)In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 76, no 1, 12Article in journal (Refereed) PublishedText
Abstract [en]

A search for the flavour-changing neutral-current decay is presented. Data collected by the ATLAS detector during 2012 from proton-proton collisions at the Large Hadron Collider at a centre-of-mass energy of root s = 8 TeV, corresponding to an integrated luminosity of 20.3 fb(-1), are analysed. Top-quark pair-production events with one top quark decaying through the t -> qZ (q = u,c) channel and the other through the dominant Standard Model mode t -> bW are considered as signal. Only the decays of the Z boson to charged leptons and leptonic W boson decays are used. No evidence for a signal is found and an observed (expected) upper limit on the t -> qZ branching ratio of 7 x 10(-4) (8 x 10(-4)) is set at the 95 % confidence level.

Place, publisher, year, edition, pages
2016. Vol. 76, no 1, 12
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Physical Sciences
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URN: urn:nbn:se:kth:diva-182042DOI: 10.1140/epjc/s10052-015-3851-5ISI: 000367813200001ScopusID: 2-s2.0-84954529072OAI: oai:DiVA.org:kth-182042DiVA: diva2:902794
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QC 20160212

Available from: 2016-02-12 Created: 2016-02-12 Last updated: 2016-02-12Bibliographically approved

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Lund-Jensen, BengtSidebo, P. EdvinStrandberg, Jonas
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Particle and Astroparticle Physics
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