Search for flavor-changing neutral currents in top-quark decays t -> Zq in pp collisions at root s=8 TeV
Type :
Article
Publication Status :
published
Access :
openAccess
Abstract
A search for flavor-changing neutral currents in top-quark decays t -> Zq is performed in events produced from the decay chain (tt) over bar -> 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.
Source :
Physical Review Letters
Date :
2014-05-02
Volume :
112
Issue :
17
Publisher :
American Physical Society
URI
http://hdl.handle.net/10679/764http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.112.171802
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