Two dark matter candidates in a doublet-triplet Higgs model

Abstract

We study a Standard Model extension that provides a bicomponent dark matter scenario as well as a mechanism for the generation of left-handed neutrino masses. We extend the Standard Model scalar sector by adding an inert $SU(2)_L$ doublet with hypercharge $Y= 1/2$ and a triplet with hypercharge $Y=0$. These scalars provide dark matter candidates in two dark sectors stabilised by discrete symmetries. We consider the contribution of both candidates to the total relic abundance in order to recover the desert regions in their standard alone cases. In addition, we add an active scalar $SU(2)_L$ triplet with hypercharge $Y=1$ in order to generate light neutrino masses. We analyse the results of dark matter phenomenology for the model and the neutrino mass generation through the type-II seesaw mechanism.