Compressing the Inert Doublet Model

Abstract

The Inert Doublet Model relies on a discrete symmetry to prevent couplings of the new scalars to Standard Model fermions. This stabilizes the lightest inert state, which can then contribute to the observed dark matter density. In the presence of additional approximate symmetries, the resulting spectrum of exotic scalars can be compressed. Here, we study the phenomenological and cosmological implications of this scenario. We derive new limits on the compressed Inert Doublet Model from LEP, and outline the prospects for exclusion and discovery of this model at dark matter experiments, the LHC, and future colliders.

32 pages, 9 figures. References added; other minor changes to match journal version

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• Observability of Inert Scalars at the LHC
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• Relic density of dark matter in the inert doublet model beyond leading order for the low mass region: 1. Renormalisation and constraints
• Phenomenology of the Inert Doublet Model with a global U(1) symmetry
• Dark matter and electroweak phase transition in the mixed scalar dark matter model
• Revisiting one-loop corrections to the trilinear Higgs boson self-coupling in the Inert Doublet Model
• Relic density of dark matter in the inert doublet model beyond leading order for the low mass region: 3. Annihilation in 3-body final state
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• One-loop Corrections to the Higgs Boson Invisible Decay in the Dark Doublet Phase of the N2HDM
• Searching for GeV-scale Majorana Dark Matter: inter spem et metum
• Minimal Dark Matter in the Local $B-L$ Extension
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• Probing CP Violation in Dark Sector through the Electron Electric Dipole Moment