# Singlet-Doublet Fermionic Dark Matter, Neutrino Mass and Collider Signatures

## TL;DR

This paper introduces a minimal extension to the Standard Model adding a scalar triplet and vector-like leptons to simultaneously explain neutrino masses and dark matter, with distinctive collider and direct detection signatures.

## Contribution

It proposes a novel model combining scalar triplet and vector-like leptons to address neutrino mass and dark matter in a unified framework.

## Key findings

- Dark matter is a mixture of vector-like lepton doublet and singlet.
- Higgs-mediated direct detection is promising at Xenon-1T.
- Charged partner particles can produce detectable signatures at LHC.

## Abstract

We propose a minimal extension of the standard model (SM) by including a scalar triplet with hypercharge 2 and two vector-like leptons: one doublet and a singlet, to explain simulatenously the non-zero neutrino mass and dark matter (DM) content of the Universe. The DM emerges out as a mixture of the neutral component of vector-like lepton doublet and singlet, being odd under a discrete $Z_2$ symmetry. After electroweak symmetry breaking the triplet scalar gets an induced vev, which give Majorana masses not only to the light neutrinos but also to the DM. Due to the Majorana mass of DM, the $Z$ mediated elastic scattering with nucleon is forbidden. However, the Higgs mediated direct detection cross-section of the DM gives an excellent opportunity to probe it at Xenon-1T. The DM can not be detected at collider. However, the charged partner of the DM (often next-to-lightest stable particle) can give large dispalced vertex signature at the Large Hadron Collider (LHC).