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

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 Z(2) symmetry. We explore the parameter space of themodel 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.

Automated summary

In this study, a fermionic dark matter is considered in the left-right symmetric framework, where a pair of vector-like doublets are introduced to ensure the stability of the dark matter. The parameter space of the model is explored to accommodate the observed relic density and detection cross sections. The presence of charged dark fermions allows for the possibility of a doubly charged Higgs signal at LHC and ILC, which is analyzed in multilepton final states for representative parameter choices consistent with dark matter observations.