A search for flavour changing neutral currents in top-quark decays in pp collision data collected with the ATLAS detector at √s = 7 TeV
Entity
UAM. Departamento de Física TeóricaPublisher
Springer Verlag; SISSA 2012Date
2012-09-28Citation
10.1007/JHEP09(2012)139
Journal of High Energy Physics 2012.9 (2012): 1-36
ISSN
1126-6708 (print); 1029-8479 (online)DOI
10.1007/JHEP09(2012)139Editor's Version
http://dx.doi.org/10.1007/JHEP09(2012)139Subjects
Hadron-hadron scattering; Top physics; Rare decays; Flavour changing neutral currents; FísicaNote
Journal of High Energy Physics 2012.9 (2012): 1-36 reproduced by permission of Scuola Internazionale Superiore di Studi Avanzati (SISSA)Rights
Copyright CERN; © SISSA 2012Abstract
A search for flavour changing neutral current (FCNC) processes in top-quark decays by the ATLAS Collaboration is presented. Data collected from pp collisions at the LHC at a centre-of-mass energy of √s = 7 TeV during 2011, corresponding to an integrated luminosity of 2.1 fb-1, were used. A search was performed for top-quark pair-production events, with one top quark decaying through the t → Zq FCNC (q = u, c) channel, and the other through the Standard Model dominant mode t → Wb. Only the decays of the Z boson to charged leptons and leptonic W-boson decays were considered as signal. Consequently, the final-state topology is characterised by the presence of three isolated charged leptons, at least two jets and missing transverse momentum from the undetected neutrino. No evidence for an FCNC signal was found. An upper limit on the t → Zq branching ratio of BR(t → Zq) < 0.73% is set at the 95% confidence level
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Google Scholar:ATLAS Collaboration
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Aad, G.
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Arnal, V.
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Barreiro Alonso, Fernando
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Cantero, J.
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de la Torre, H.
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Peso Malagón, José del
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Glasman Kuguel, Claudia Beatriz
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Labarga Echeverría, Luis Alfonso
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Lagouri, T.
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Llorente Merino, J.
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March, Luis
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Terrón Cuadrado, Juan
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