Dark Matter Phenomenology of SM and Enlarged Higgs Sectors Extended with Vector Like Leptons

Abstract

We will investigate the scenario in which the Standard Model (SM) Higgs sector and its 2-doublet extension (called the Two Higgs Doublet Model or 2HDM) are the "portal" for the interactions between the Standard Model and a fermionic Dark Matter (DM) candidate. The latter is the lightest stable neutral particle of a family of vector-like leptons (VLLs). We will provide an extensive overview of this scenario combining the constraints purely coming from DM phenomenology with more general constraints like Electro-weak Precision Tests (EWPT) as well as with collider searches. In the case that the new fermionic sector interacts with the SM Higgs sector, constraints from DM phenomenology force the new states to lie above the TeV scale. This requirement is relaxed in the case of 2HDM. Nevertheless, strong constraints coming from Electroweak Precision Tests (EWPT) and the Renormalization Group Equations (RGEs) limit the impact of VLFs on collider phenomenology.

32 pages, 12 figures

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• The Waning of the WIMP? A Review of Models, Searches, and Constraints
• Dark Matter through the Higgs portal
• Prospects for vectorlike leptons at future proton-proton colliders
• Multistep Strongly First Order Phase Transitions from New Fermions at the TeV Scale
• 2HDM portal for Singlet-Doublet Dark Matter
• Model-independent constraints with extended dark matter EFT
• Predictions for Muon Electric and Magnetic Dipole Moments from $h\to {\mu }^{+}{\mu }^{-}$ in Two-Higgs-Doublet Models with New Leptons
• The Two Scales of New Physics in Higgs Couplings
• Dark Matter and Collider Searches in $S_3$-Symmetric 2HDM with Vector Like Leptons
• The Higgs boson decay into ZZ decaying to identical fermion pairs
• The Two Scales of New Physics in Loop-Induced Higgs Couplings
• Signals for vector-like leptons in an $S_3$-symmetric 2HDM at ILC
• Simplified Dark Matter Models