# Constraining the Inert Doublet Model using Vector Boson Fusion

## TL;DR

This paper constrains the Inert Doublet Model's parameter space using Vector Boson Fusion searches for invisible Higgs decays, combining collider and dark matter constraints to identify viable regions.

## Contribution

It provides the first comprehensive analysis combining collider and dark matter constraints to limit the Inert Doublet Model parameter space, especially for dark scalar masses below 100 GeV.

## Key findings

- Large parts of the parameter space are ruled out for mH <= 100 GeV.
- Collider constraints exclude some regions not covered by dark matter data.
- Sensitivity of monojet and multilepton searches is discussed.

## Abstract

In this work, we use a recast of the Run II search for invisible Higgs decays within Vector Boson Fusion to constrain the parameter space of the Inert Doublet model, a two Higgs doublet model with a dark matter candidate. When including all known theoretical as well as collider constraints, we find that the above can rule out a relatively large part in the mH-lambda345 parameter space, for dark scalar masses mH <= 100 GeV. Including the latest dark matter constraints, a smaller part of parameter space remains which is solely excluded from the above analysis. We also discuss the sensitivity of monojet searches and multilepton final states from Run II.