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

TL;DR

This paper explores how extended Higgs sectors and vector-like leptons influence dark matter interactions, with constraints from phenomenology, precision tests, and collider searches shaping the viable parameter space.

Contribution

It provides a comprehensive analysis of dark matter phenomenology in models with extended Higgs sectors and vector-like leptons, highlighting the impact of various experimental constraints.

Findings

Dark matter interactions via Higgs portals require new states above TeV scale in SM Higgs sector.

Two Higgs Doublet Model relaxes some constraints, allowing lighter new states.

Electroweak precision tests and RGEs significantly limit collider phenomenology of 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.