Large $t\to cZ$ as a Sign of Vector-Like Quarks in Light of the $W$ Mass

@inproceedings{Crivellin2022LargeC,
  title={Large \$t\to cZ\$ as a Sign of Vector-Like Quarks in Light of the \$W\$ Mass},
  author={Andreas Crivellin and Matthew Kirk and Teppei Kitahara and Federico Mescia},
  year={2022}
}
The rare flavour changing top quark decay t → cZ is a clear sign of new physics and experimentally very interesting due to the huge number of top quarks produced at the LHC. However, there are few (viable) models which can generate a sizable branching ratio for t → cZ – in fact vector-like quarks seem to be the only realistic option. In this paper, we investigate all three representations (under the Standard Model gauge group) of vector-like quarks ( U , Q 1 and Q 7 ) that can generate a sizable… 
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