CP-Violating 2HDMs Emerging from 3-3-1 Models

TL;DR

This paper explores CP violation in two-Higgs-doublet models derived from 3-3-1 gauge models, highlighting how extended symmetries introduce new CP phases affecting neutron EDM predictions.

Contribution

It demonstrates how 3-3-1 models lead to distinctive Yukawa structures with new CP phases, impacting neutron EDM calculations and constraining Higgs masses and phases.

Findings

Neutron EDM can be just below current experimental limits.

Charged Higgs mass around a few hundred GeV fits experimental constraints.

New CP phases are of order one, influencing EDM predictions.

Abstract

We investigate CP violating 2 Higgs doublet models as an effective theory emerging from models with an $SU(3)_L \otimes U(1)_X$ gauge symmetry. Because of the extension of the electroweak symmetry, a characteristic structure of Yukawa interactions appears with new CP violating phases at the electroweak scale. In this scenario, the charged Higgs boson loop provides dominant and sizable contributions to the neutron electric dipole moment (nEDM) at one-loop level. We find that the prediction of the nEDM can be slightly smaller than the current upper limit, ${\cal O}(10^{-26})\,e\,\text{cm}$, with the mass of the charged Higgs boson and new CP violating phases to be a few hundred GeV and $\mathcal{O}(1)$, respectively, under the constraints from the meson mixings, the $B \to X_s \gamma$ decay and current LHC data.