Search for flavor changing neutral currents in decays of top quarks

Understand

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.