Search for Flavor-Changing Neutral Currents in Top-Quark Decays t - GT Zq in pp Collisions at root s=8 TeV
CMS Collaboration (ukupan broj autora: 2201)
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A search for flavor-changing neutral currents in top-quark decays t - GT Zq is performed in events produced from the decay chain (tt) over bar - GT 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, 2014, 112, 17
- BMWF, FWF (Austria), FNRS, FWO (Belgium), CNPq, CAPES, FAPERJ, FAPESP