Light Dirac right-handed sneutrino dark matter

TL;DR

This paper proposes that a mostly right-handed Dirac sneutrino can serve as a viable light dark matter candidate, capable of explaining some direct detection signals while remaining consistent with existing experimental constraints.

Contribution

It demonstrates the viability of right-handed Dirac sneutrinos as dark matter and explores their potential to explain direct detection signals within experimental bounds.

Findings

Right-handed Dirac sneutrino can have detectable interactions with nuclei.

Possible explanation for signals observed at CDMS II-Si and CoGeNT.

Remaining parameter space outside XENON100 exclusion limits.

Abstract

We show that mostly right-handed Dirac sneutrino is a viable supersymmetric light dark matter candidate. While the Dirac sneutrino scattering with nuclei is dominantly through the $Z$ boson exchange and is stringently constrained by the invisible decay width of $Z$ boson, it is possible to realize a large enough cross section with nucleon to account for possible signals observed at direct dark matter searches such as CDMS II-Si or CoGeNT. Even if the XENON100 limit is taken into account, a small part of signal region for CDMS II-Si events remains outside the excluded region by XENON100.