  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
t-bar 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 5.0 inverse
femtobarns of proton-proton collisions at a center-of-mass energy of 7 TeV,
collected with the CMS detector at the LHC. The observed number of events
agrees 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 0.21% is excluded at the 95% confidence level.
