Higgs CP Violation from Vectorlike Quarks

TL;DR

This paper investigates CP violation in the Higgs sector caused by vectorlike quarks, highlighting unique interactions in the hWW channel and constraints from rare B decays and electric dipole moments.

Contribution

It introduces a model where vectorlike quarks induce Higgs CP violation primarily in the hWW channel, providing new experimental avenues for detection.

Findings

Higgs CP violation occurs mainly in the hWW channel.

Rare B decays impose strong constraints on CP violation.

Electric dipole moments also limit the CP violating effects.

Abstract

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.