A Minimal Dark Matter Model with Vector Like Fermions

We study a simplest viable dark matter model with a SU(2) real singlet scalar, vector-like singlet and a doublet lepton. We find a considerable enhancement in the allowed region of the scalar dark matter parameter space under the influence of the new Yukawa coupling. In particular, the Yukawa coupling associated with the fermion sector profoundly influences the dark matter parameter space, greatly enhancing the regions that comply with the current observed relic density of the Universe.