Vector-like Fermions and Higgs Effective Field Theory Revisited

Understand

Heavy vector-like quarks (VLQs) appear in many models of beyond the Standard Model physics.

• Direct experimental searches require these new quarks to be heavy, $\gsim$ 800-1000 GeV.
• We perform a global fit of the parameters of simple VLQ models in minimal representations of $SU(2)_L$ to precision data and Higgs rates.
• An interesting connection between anomalous $Z b {\overline {b}}$ interactions and Higgs physics in VLQ models is discussed.