Search for flavor-changing neutral currents in top-quark decays t -> Zq in pp collisions at root(s) = 8 TeV

A search for flavor-changing neutral currents in top-quark decays t -> Zq is performed in events produced from the decay chain t(t)over-bar -> Zq+Wb, where both vector bosons decay leptonically, producing a final state with three leptons (electrons or muons). A data set collected with the CMS detector at the LHC is used, corresponding to an integrated luminosity of 19.7  fb-1 of proton-proton collisions at a center-of-mass energy of 8 TeV. No excess is seen in the observed number of events relative to the standard model prediction; thus, no evidence for flavor-changing neutral currents in top-quark decays is found. A combination with a previous search at 7 TeV excludes a t -> Zq branching fraction greater than 0.05% at the 95% confidence level.