Search for flavor changing neutral currents in top quark decays in pp collisions at 8 TeV

The results of a search for flavor changing neutral currents in top quark decays $t\to Zq$ in events with a topology compatible with the decay chain $t \overline{t} \to Wb+Zq \to \ell\nu b +\ell\ell q$ are presented. The search is performed with a data sample corresponding to an integrated luminosity of 19.5 $\text{fb}^{-1}$ of proton-proton collisions at a center-of-mass energy of 8~TeV, collected with the CMS detector at the LHC. The observed number of events are compatible with the standard model prediction and no evidence for flavor changing neutral currents in top quark decays is found. A $t \to Zq$ branching fraction greater than 0.07\% is excluded at the 95\% confidence level.