Search for flavor-changing neutral currents in top quark decays at ATLAS

Details Search for flavor-changing neutral currents in top quark decays at ATLAS Search for flavor-changing neutral currents in top quark decays at ATLAS

2012-01-20

arxiv.org/abs/1201.4308v1

Physics

High Energy Physics

High Energy Physics - Experiment

Presented at the 2011 Hadron Collider Physics symposium (HCP-2011), Paris, France, November 14-18 2011, 3 pages, 4 figures

Scientific paper

ATLAS results are presented on a search for flavor-changing neutral currents (FCNC) in top quark decays at the LHC. Events are searched for where a pair of top quarks is produced and one decays through the Standard Model $t \rightarrow Wb$ mode while the other decays through the FCNC mode $t \rightarrow qZ$. Leptonic final states are used in which both the $W$- and $Z$-bosons decay leptonically, yielding final states with three leptons and two jets. The observed events are consistent with the expected backgrounds from Drell-Yan and diboson production and a limit on the FCNC branching ratio of top quarks to $qZ$ is set.

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