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

Abstract : A search for flavor-changing neutral currents in top-quark decays t to Zq is performed in events produced from the decay chain t t-bar to Zq+Wb, where both vector bosons decay leptonically, producing a final state with three leptons (electrons or muons). A dataset collected with the CMS detector at the LHC is used, corresponding to an integrated luminosity of 19.7 inverse femtobarns 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 to Zq branching fraction greater than 0.05% at the 95% confidence level.
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http://hal.in2p3.fr/in2p3-00919538
Contributor : Sylvie Flores <>
Submitted on : Tuesday, December 17, 2013 - 7:34:19 AM
Last modification on : Friday, September 10, 2021 - 1:50:06 PM

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S. Chatrchyan, S. Baffioni, F. Beaudette, P. Busson, C. Charlot, et al.. Search for flavor-changing neutral currents in top-quark decays t to Zq in pp collisions at sqrt(s)=8 TeV. Physical Review Letters, American Physical Society, 2014, 112, pp.171802. ⟨10.1103/PhysRevLett.112.171802⟩. ⟨in2p3-00919538⟩

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