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# A fermionic portal to vector dark matter from a new gauge sector

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Record type: UNSPECIFIED

## Abstract

We present a class of new physics scenarios wherein the Standard Model (SM) is extended with a new $SU(2)_D$ dark gauge sector. These frameworks typically include a $\mathbb{Z}_2$ parity under which states transforming non-trivially under $SU(2)_D$ have different parity assignments. After spontaneous breaking of the $SU(2)_D$ symmetry via a new scalar doublet, the ensuing massive vector bosons with non-zero D-isospin are Dark Matter (DM) candidates. Non-renormalisable kinetic mixing in the gauge sector or a Higgs portal are not required to connect the dark sector to the SM. We introduce instead a Vector-Like (VL) fermion doublet of $SU(2)_D$, the members of which are singlets of the SM Electro-Weak (EW) gauge group, which mediates the interactions between the dark sector and the SM itself. This class of Fermion Portal Vector DM (FPVDM) allows multiple realisations, depending on the properties of the the VL partner and the scalar potential. As a practical example, here, we discuss in detail a realisation involving a VL top partner assuming no mixing between the two scalars of the theory. We then provide bounds from collider and astroparticle observables. The origin of the $\mathbb{Z}_2$ symmetry in this class of models can be justified in the form of a dark EW sector or through an underlying composite structure. The new class of FPVDM models we suggest here has a large number of phenomenological applications depending on the mediator properties and can be used for collider and non-collider studies alike, some of which we outline here for future studies.

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2204.03510v1 - Author's Original

Accepted/In Press date: 7 April 2022
Keywords: hep-ph

## Identifiers

Local EPrints ID: 472299
URI: http://eprints.soton.ac.uk/id/eprint/472299
PURE UUID: ed71dac6-bf75-4bfe-8b68-3c0d43c3bfe7
ORCID for Alexander Belyaev: orcid.org/0000-0002-1733-4408
ORCID for Stefano Moretti: orcid.org/0000-0002-8601-7246

## Catalogue record

Date deposited: 30 Nov 2022 18:00

## Contributors

Author: Aldo Deandrea
Author: Stefano Moretti
Author: Luca Panizzi
Author: Nakorn Thongyoi