A 2HDM for the g-2 and Dark Matter

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.

Comments: 9 pages, 8 figures. Text improved. Bounds from parity violation experiments included. Expanded discussion. References added