Classification of anomaly-free 2HDMs with a gauged U(1)' symmetry

TL;DR

This paper provides a comprehensive classification of eleven anomaly-free two-Higgs-doublet models with a gauged U(1)' symmetry, highlighting new models and analyzing their experimental viability.

Contribution

It offers the first complete survey of anomaly-free 2HDMs with U(1)' symmetry, including previously unexplored models, serving as a catalog for future research.

Findings

Identified eleven anomaly-free 2HDMs with U(1)' symmetry.

Analyzed experimental bounds on these models.

Highlighted models with potential phenomenological interest.

Abstract

Two-Higgs-doublet models (2HDMs) with a flavored U(1)' gauge symmetry are a popular extension to the Standard Model (SM), yet they currently lack a complete survey. In this paper, we present a full classification of anomaly-free 2HDMs within the SM fermion content, resulting in a total of eleven distinct models. Four of these are relatively well-studied, while the rest either partially, or entirely, lack previous treatment. We study these textures under a variety of experimental bounds, focusing mainly on the previously unexplored models. This work is intended to act as a catalog to models worth considering in greater detail.