Minimal Vector-like leptonic Dark Matter and Signatures at the LHC

Understand

We propose a minimal vector-like leptonic dark matter (DM) with renormalisable interaction in a beyond the Standard Model (SM) scenario, where the SM is augmented with a vector-like doublet and a singlet leptons.

• The additional fermions are odd under a discrete $Z_2$ symmetry, while the rest of the SM particles are singlets, and thus providing stability to the DM.
• In this scenario, we show that, the DM emerges as an admixture of the neutral component of the vector-like doublet and the singlet leptons.
• The singlet-doublet mixing ($\sin \theta$) plays a crucial role in yielding the correct relic density as well as in obtaining null direct DM search results through an interplay of interactions via $Z$ and Higgs mediation.