Abstract
A search for flavor-changing neutral currents in top-quark decays is performed in events produced from the decay chain , 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 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 branching fraction greater than 0.05% at the 95% confidence level.
- Received 15 December 2013
DOI:https://doi.org/10.1103/PhysRevLett.112.171802
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© 2014 CERN, for the CMS Collaboration