Singlet scalar Dark Matter in Dark Two Higgs Doublet Model

TL;DR

This paper explores a Dark Two Higgs Doublet Model with an added $U(1)'$ symmetry, proposing a gauge singlet as a dark matter candidate and analyzing the parameter space to match observed relic density.

Contribution

It introduces a novel dark matter candidate within the D2HDM framework and derives constraints linking the masses of the dark matter particle and $Z'$ boson.

Findings

Identifies parameter space consistent with observed relic density.

Establishes a relation between $m_S$ and $m_{Z'}$ for given $ aneta$.

Provides phenomenological constraints on the model.

Abstract

We consider the case of the Dark Two Higgs Doublet Model (D2HDM) where a $U(1)'$ symmetry group and an extra Higgs doublet are added to the Standard Model. This model leads to a gauge singlet particle as an interesting Dark Matter (DM) candidate. We obtain phenomenological constraints to the parameter space of the model considering the one necessary to produce the correct density of thermal relic dark matter $\Omega h^2$. We find a relation between the masses of the DM matter candidate $m_S$ and $m_{Z'}$ that satisfy the relic density for given values of $\tan\beta$.