A 2HDM for the g-2 and Dark Matter

TL;DR

This paper proposes a Two Higgs Doublet Model with an Abelian gauge symmetry to explain the muon g-2 anomaly and provide a viable light dark matter candidate, aligning with recent experimental results.

Contribution

It introduces a novel 2HDM framework that simultaneously addresses the muon g-2 anomaly and dark matter, consistent with current experimental constraints.

Findings

The model explains the muon g-2 discrepancy within 4.2σ significance.

It provides a viable light dark matter candidate compatible with existing bounds.

The framework aligns with recent FERMILAB and Brookhaven results.

Abstract

The Muon g-2 experiment at FERMILAB has confirmed the muon anomalous magnetic moment anomaly with an error bar 15% smaller and a different central value compared with the previous Brookhaven result. The combined results from FERMILAB and Brookhaven show a difference with theory at a significance of $4.2\sigma$, strongly indicating the presence of new physics. In light of this new result, we discuss a Two Higgs Doublet model augmented by an Abelian gauge symmetry that can simultaneously accommodate a light dark matter candidate and $(g-2)_\mu$, in agreement with existing bounds.