Resurrecting Sneutrino ($\tilde{\nu}_L$) Dark Matter in light of Neutrino Mass and LUX

TL;DR

This paper proposes an extension to the MSSM with triplets to make the left-handed sneutrino a viable dark matter candidate, compatible with neutrino masses and current detection constraints.

Contribution

It introduces a triplet extension to the MSSM that enables sneutrino dark matter to have the correct relic abundance and evade direct detection limits.

Findings

Sneutrino mass range 370-550 GeV can produce the correct relic abundance.

Triplet extension generates small Majorana neutrino masses.

Model satisfies current Xenon100 and LUX direct detection constraints.

Abstract

In the minimal supersymmetric standard model (MSSM) the lightest superpartner of the left-handed neutrinos is ruled out of being a candidate of dark matter because of its large elastic cross-section with the nucleus mediated via Z-boson. We resurrect it by extending the MSSM with two triplets with opposite hypercharge. The addition of the triplets not only play a role in generating small Majorana masses for the left-handed active neutrinos but also make the lightest sneutrino a viable candidate for dark matter. We then discuss the relevant parameter space in details which can give rise to the right amount of (thermal) relic abundance as well as satisfy the current direct detection constraints from Xenon100 and LUX. We find that sneutrino dark matter with mass 370-550 GeV can give rise to right thermal relic abundance while co-annihilating with the bino-like neutralino.