CP-Violation in a Composite 2-Higgs Doublet Model

TL;DR

This paper investigates CP-violation in a composite two-Higgs-doublet model derived from a specific symmetry breaking pattern, analyzing how complex phases influence the Higgs potential and Yukawa couplings, with potential observable effects.

Contribution

It introduces a novel composite 2-Higgs doublet model based on $SO(6)/[SO(4)\times SO(2)]$ symmetry breaking, analyzing CP-violation sources and their phenomenological implications.

Findings

Significant CP-violation effects can arise even with a single complex phase.

The model predicts distinctive CP-violating observables.

Dependence of CPV on complex phases in fermion interactions is characterized.

Abstract

We study CP-Violation (CPV) in a Composite 2-Higgs Doublet Model (C2HDM) based on the global symmetry breaking $SO(6)/[SO(4)\times SO(2)]$, wherein the strong sector is modeled by a two-site moose structure. Non-trivial complex phases in the interactions involving fermions in both the elementary and strong sectors can induce CPV in the Higgs potential as well as the Yukawa coupling parameters. We compute both of the latter and analyse their dependence upon the aforementioned complex phases. Finally, we discuss physics observables which are distinctive of this model. Even in the simplest case with only one complex phase in the strong sector we can get significant CPV effects.