Right-handed sneutrino as thermal dark matter

TL;DR

This paper proposes a supersymmetric model extension where a right-handed sneutrino acts as a viable thermal dark matter candidate, capable of being detected directly due to its strong coupling with a singlet field.

Contribution

It introduces a new model extending the MSSM with a singlet and right-handed neutrinos, enabling the right-handed sneutrino to serve as detectable thermal dark matter.

Findings

Right-handed sneutrino can be a thermal relic dark matter candidate.

The model predicts a large scattering cross section with nuclei.

Potential for direct detection in upcoming experiments.

Abstract

We study an extension of the MSSM with a singlet S with coupling SH1H2 in order to solve the mu problem as in the NMSSM, and right-handed neutrinos N with couplings SNN in order to generate dynamically electroweak-scale Majorana masses. We show how in this model a purely right-handed sneutrino can be a viable candidate for cold dark matter in the Universe. Through the direct coupling to the singlet, the sneutrino can not only be thermal relic dark matter but also have a large enough scattering cross section with nuclei to detect it directly in near future, in contrast with most of other right-handed sneutrino dark matter models.