Inert Doublet Model in light of LHC Run I and astrophysical data

TL;DR

This paper analyzes the parameter space of the Inert Doublet Model considering collider and astrophysical constraints, identifying viable regions and proposing benchmark scenarios for LHC searches.

Contribution

It provides a comprehensive analysis of the IDM parameter space with updated constraints and introduces benchmark points for collider experiments.

Findings

Mass degeneracy in dark scalar sector for masses < 200 GeV

Minimal dark scalar mass scale around 45 GeV

Hierarchy with MH > MA is strongly favored

Abstract

We discuss the parameter space of the Inert Doublet Model, a two Higgs doublet model with a dark matter candidate. An extensive set of theoretical and experimental constraints on this model is considered, where both collider as well as astroparticle data limits, the latter in the form of dark matter relic density as well as direct detection, are taken into account. We discuss the effects of these constraints on the parameter space of the model. In particular, we do not require the IDM to provide the full dark matter content of the universe, which opens up additional regions in the parameter space accessible at collider experiments. The combination of all constraints leads to a relatively strong mass degeneracy in the dark scalar sector for masses < 200 GeV, and to a minimal scale ~ 45 GeV for the dark scalar masses. We also observe a stringent mass hierarchy MH > MA. We propose benchmark points and benchmark planes for dark scalar pair-production for the current LHC run being in compliance with all theoretical as well as experimental bounds.