CMS Collaboration2014-07-022014-07-022014CMS Collaboration. "Search for Flavor-Changing Neutral Currents in Top-Quark Decays t → Zq in pp Collisions at √s=8 TeV." <i>Physical Review Letters,</i> 112, (2014) American Physical Society: 171802. http://dx.doi.org/10.1103/PhysRevLett.112.171802.https://hdl.handle.net/1911/76161A search for flavor-changing neutral currents in top-quark decays t→Zq is performed in events produced from the decay chain tt¯→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.engArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.Journal articlehttp://dx.doi.org/10.1103/PhysRevLett.112.171802