Neutrino Masses and Scalar Singlet Dark Matter

TL;DR

This paper introduces a minimal extension to the Standard Model that provides a dark matter candidate and explains tiny neutrino masses, with detailed analysis of experimental constraints and phenomenology.

Contribution

It presents a novel model combining scalar singlet dark matter with neutrino mass generation via higher-dimensional operators.

Findings

Scalar singlet DM remains viable under relic density and direct detection constraints.

Neutrino masses generated through dimension seven operators involving new scalars.

Model constraints from LHC data are discussed.

Abstract

We propose a simple extension of the Standard Model (SM) which has a viable dark matter (DM) candidate, as well as can explain the generation of tiny neutrino masses. The DM is an electroweak (EW) singlet scalar $S$, odd under an imposed exact $Z_2$ symmetry, interacting to SM through `Higgs-portal' coupling, while all other particles are even under $Z_2$. The model also has an EW isospin $3/2$ scalar, $\Delta$ and a pair of EW isospin vector, $\Sigma$ and $\bar{\Sigma}$, responsible for generating tiny neutrino mass via the effective dimension seven operator. Thanks to the additional interactions with $\Delta$, the scalar singlet DM $S$ survives a large region of parameter space by relic density constraints from WMAP/PLANCK and direct search bounds from updated LUX data. Constraints on the model from Large Hadron Collider (LHC) has also been discussed.