Fermionic dark matter and neutrino masses in a $\mathcal{B}-\mathcal{L}$ model

Abstract

In this work we present a common framework for neutrino mass and dark matter. Specifically, we work with a local $\mathcal{B}-\mathcal{L}$ extension of the standard model which has three right-handed neutrinos, $n_{R_i}$, and some extra scalars, $\Phi$, ${\varphi }_i$ besides the standard model fields. The $n_{R_i}$'s have non-standard $\mathcal{B}-\mathcal{L}$ quantum numbers and thus these couple to different scalars. This model has the attractive property that an almost automatic $Z_2$ symmetry acting only on a fermionic field, $n_{R3}$, is present. Taking advantage of this $Z_2$ symmetry, we study both the neutrino mass generation via a natural see-saw mechanism in low energy and the possibility of $n_{R3}$ to be a DM candidate. For this last purpose, we study its relic abundance and its compatibility with the current direct detection experiments.

Comments: 29 pages, 5 figures