Majorana Dark Matter and Neutrino mass in a singlet-doublet extension of the Standard Model
Abstract
A minimal extension of the Standard Model (SM) by a vector-like fermion doublet and three right handed (RH) singlet neutrinos is proposed in order to explain dark matter and tiny neutrino mass simultaneously. The DM arises as a mixture of the neutral component of the fermion doublet and one of the RH neutrinos, both assumed to be odd under an imposed Z2 symmetry. Being Majorana in nature, the DM escapes from Z-mediated direct search constraints to mark a significant difference from singlet-doublet Dirac DM. The other two Z2 even heavy RH neutrinos give rise masses and mixing of light neutrinos via Type-I Seesaw mechanism. Relic density and direct search allowed parameter space for the model is investigated through detailed numerical scan.
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