Neutrino mass and the Higgs portal dark matter in the ESSFSM

TL;DR

This paper extends the standard model by adding right-handed neutrinos and a scalar, explaining neutrino masses via the seesaw mechanism and identifying new dark matter candidates consistent with current experimental constraints.

Contribution

It introduces a novel model with specific symmetries that simultaneously addresses neutrino masses and dark matter within an extended standard model framework.

Findings

Neutrino mass-squared differences explained by type-I seesaw.

Viable dark matter candidates identified compatible with experimental data.

New parameter space regions consistent with relic density and detection constraints.

Abstract

We extend the standard model with three right-handed singlet neutrinos and a real singlet scalar. We impose two $Z_2$ and $Z_2^\prime$-symmetries. We explain the tiny neutrino mass-squared differences with two $Z_2$- and $Z_2^\prime$-even right-handed neutrinos using the type-I seesaw mechanism. The $Z_2$-odd fermion and the $Z_2^\prime$-odd scalar can both serve as viable dark matter candidates. We identify new regions in the parameter space which are consistent with relic density of the dark matter, recent direct search experiment LUX-2016, XENON1T-2017 and LHC data.