Sneutrino Dark Matter in Gauged Inverse Seesaw Models for Neutrinos

TL;DR

This paper explores a supersymmetric model where a light sneutrino acts as inelastic dark matter, linking neutrino mass generation to dark matter properties and proposing testable detection signals.

Contribution

It introduces a gauged inverse seesaw model with a light sneutrino as inelastic dark matter, connecting neutrino masses to dark matter phenomenology and predicting detectable signals.

Findings

Light sneutrino as inelastic dark matter candidate in the 5-20 GeV range

Predicted differential scattering rate and annual modulation signals for future detectors

Connection between small neutrino Majorana masses and keV-scale mass splitting in dark matter

Abstract

Extending the Minimal Supersymmetric Standard Model (MSSM) to explain small neutrino masses via the inverse seesaw mechanism can lead to a new light supersymmetric scalar partner which can play the role of inelastic dark matter (iDM). It is a linear combination of the superpartners of the neutral fermions in the theory (the light left-handed neutrino and two heavy Standard Model singlet neutrinos) which can be very light with mass in $\sim 5-20$ GeV range, as suggested by some current direct detection experiments. The iDM in this class of models has keV-scale mass splitting, which is intimately connected to the small Majorana masses of neutrinos. We predict the differential scattering rate and annual modulation of the iDM signal which can be testable at future Germanium- and Xenon-based detectors.