# A variant two-Higgs doublet model with a new Abelian gauge symmetry

## TL;DR

This paper proposes a two-Higgs doublet model with a new Abelian gauge symmetry that explains the muon g-2 anomaly, provides a dark matter candidate, and remains consistent with flavor and collider constraints.

## Contribution

It introduces a novel variant of the two-Higgs doublet model with a broken Abelian gauge symmetry, addressing muon g-2 and dark matter in a unified framework.

## Key findings

- The model can explain the muon anomalous magnetic moment.
- Dark matter interacts via Higgs portal and Z' boson.
- Strong constraints from dark matter direct detection.

## Abstract

We consider a two-Higgs doublet model extended with a broken Abelian gauge symmetry under which all Standard Model (SM) quarks, fourth generation fermions and a new SM-singlet scalar boson are charged. Such a setup is shown to be able to accommodate the muon anomalous magnetic dipole moment while being consistent with existing constraints of flavor-violating decays of charged leptons and Z boson. The new scalar boson offers a suitable dark matter candidate that interacts with the SM particles via the Higgs portal and the $Z'$ boson associated with the new gauge symmetry. The dark matter direct detection bound is found to impose a strong constraint on the new gauge coupling.