Consistency of a gauged two-Higgs-doublet model: Scalar sector

TL;DR

This paper investigates the theoretical consistency and experimental viability of the scalar sector in a gauged two-Higgs-doublet model, focusing on stability, unitarity, and collider constraints.

Contribution

It provides a detailed analysis of vacuum stability, unitarity, and Higgs data constraints on the scalar potential parameters of the model.

Findings

Allowed parameter ranges for the scalar potential are identified.

Vacuum stability and unitarity impose significant constraints.

Higgs measurements restrict the scalar sector significantly.

Abstract

We study the theoretical and phenomenological constraints imposed on the scalar sector of the gauged two Higgs doublet model proposed recently as a variant of the popular inert Higgs doublet model of dark matter. The requirements of tree-level vacuum stability and perturbative unitarity in the scalar sector are analyzed in detail. Furthermore, taking into account the constraints from the 125 GeV Higgs boson measurements at the Large Hadron Collider, we map out the allowed ranges for the fundamental parameters of the scalar potential in the model.