Search for Flavor Changing Neutral Currents in Decays of Top Quarks

Tanasijczuk, Andres Jorge;D0;et.al.
(2011) Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 701, p. 313 (2011)

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We present a search for flavor changing neutral currents in decays of top quarks. The analysis is based on a search for tt¯→ℓ′νℓℓ¯+jets ( ℓ,ℓ′=e,μ ) final states using 4.1 fb −1 of integrated luminosity of pp¯ collisions at s=1.96 TeV . We extract limits on the branching ratio B(t→Zq) ( q=u,c quarks), assuming anomalous tuZ or tcZ couplings. We do not observe any sign of such anomalous coupling and set a limit of B<3.2% at 95% C.L.
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Tanasijczuk, A. J., D0, & et al. (2011). Search for Flavor Changing Neutral Currents in Decays of Top Quarks. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 701, 313. https://doi.org/10.1016/j.physletb.2011.06.014 (Original work published 2011)