  We explore CP violating aspects in the Higgs sector of models where new
vectorlike quarks carry Yukawa couplings mainly to the third generation quarks
of the Standard Model. We point out that in the simplest model, Higgs CP
violating interactions only exist in the hWW channel. At low energy, we find
that rare B decays can place similarly strong constraints as those from
electric dipole moments on the source of CP violation. These observations offer
a new handle to discriminate from other Higgs CP violating scenarios such as
scalar sector extensions of the Standard Model, and imply an interesting future
interplay among limits from different experiments.
