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arxiv: 1103.4574 · v2 · submitted 2011-03-23 · ✦ hep-ex

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Search for flavor changing neutral currents in decays of top quarks

D0 Collaboration
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classification ✦ hep-ex
keywords quarkssearchanomalouschangingcurrentsdecaysflavorneutral
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We present a search for flavor changing neutral currents in decays of top quarks. The analysis is based on a search for ttbar -> l'null + jets (l, l' = e, mu) final states using 4.1 fb^-1 of integrated luminosity of ppbar collisions at sqrt(s) = 1.96 TeV. We extract limits on the branching ratio B(t -> Zq) (q = u, c quarks), assuming anomalous tuZ or tcZ couplings. We do not observe any sign of such anomalous coupling and set a limit of B < 3.2% at 95% C.L.

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