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Search for Flavor-Changing Neutral Currents in Top-Quark Decays t→Zq in pp Collisions at √s=8 TeV
Baringer, Philip S. Bean, Alice Benelli, Gabriele Sanders, Stephen J. Stringer, Robert W.
Baringer, Philip S.
Bean, Alice
Benelli, Gabriele
Sanders, Stephen J.
Stringer, Robert W.
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Abstract
A 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.
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2013-12-15
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American Physical Society
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Baringer, Philip S., Alice Bean, Gabriele Benelli, Stephen J. Sanders, and Robert W. Stringer. "Search for Flavor-Changing Neutral Currents in Top-Quark Decays T→Zq in Pp Collisions at S√=8 TeV." American Physical Society 112.17 (2014). http://dx.doi.org/10.1103/PhysRevLett.112.171802