Emergent two-Higgs doublet models

TL;DR

This paper proposes extended gauge symmetry models that naturally produce two-Higgs doublet models with specific features and can address the strong CP problem, offering a theoretical foundation for these common assumptions.

Contribution

It introduces models with extended gauge symmetry that naturally generate two-Higgs doublet models with softly broken Z2 symmetry, CP invariance, and degenerated masses.

Findings

Models derive two-Higgs doublet features naturally.

Models can solve the strong CP problem.

Effective low-energy theories match common assumptions.

Abstract

We investigate origin of three features that are often assumed in analysis of two-Higgs doublet models: (i) softly broken Z2 symmetry, (ii) CP invariant Higgs potential, and (iii) degenerated mass spectra. We extend electroweak gauge symmetry, introducing extra gauge symmetry and extra scalars, and we show that our models effectively derive two-Higgs dou- blet models at low energy which naturally hold the three features. We also find that the models can solve the strong CP problem.