Confronting dark fermion with a doubly charged Higgs in the left-right symmetric model

TL;DR

This paper investigates fermionic dark matter within a left-right symmetric model, analyzing its relic density, detection prospects, and potential signals of doubly charged Higgs particles at colliders.

Contribution

It introduces vector-like doublets to the model, ensuring dark matter stability and exploring collider signatures of doubly charged Higgs decays into dark sector particles.

Findings

Parameter space compatible with relic density and detection constraints identified.

Potential collider signals of doubly charged Higgs in multilepton final states analyzed.

Model predicts observable signatures at LHC and ILC for certain parameters.

Abstract

We consider a fermionic dark matter (DM) in the left-right symmetric framework by introducing a pair of vector-like (VL) doublets in the particle spectrum. The stability of the DM is ensured through an unbroken $\mathcal{Z}_2$ symmetry. We explore the parameter space of the model compatible with the observed relic density and direct and indirect detection cross sections. The presence of charged dark fermions opens up an interesting possibility for the doubly charged Higgs signal at LHC and ILC. The signal for the doubly charged scalar decaying into the dark sector is analyzed in multilepton final states for a few representative parameter choices consistent with DM observations.