Search for flavor changing neutral currents in decays of top quarks

Abstract

We present a search for flavor changing neutral currents in decays of top quarks. The analysis is based on a search for tt∥→ĺll∥+jets (l,ĺ=e,μ) final states using 4.1 fb-1 of integrated luminosity of pp∥ collisions at 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. © 2011 Elsevier B.V.