Sneutrino cold dark matter, a new analysis: relic abundance and detection rates

TL;DR

This paper reevaluates sneutrinos as dark matter candidates across various supersymmetric models, analyzing relic abundance and detection prospects, and finds that models with right-handed fields are compatible with current experimental bounds.

Contribution

It provides a comprehensive analysis of sneutrino dark matter in extended supersymmetric models, including relic density and detection rates, with new insights into models with right-handed fields.

Findings

Sneutrinos are marginally compatible with experimental bounds in the standard model.

Models with right-handed fields predict detectable sneutrino dark matter.

Predicted indirect detection signals are within current and future experimental sensitivities.

Abstract

We perform a new and updated analysis of sneutrinos as dark matter candidates, in different classes of supersymmetric models. We extend previous analyses by studying sneutrino phenomenology for full variations of the supersymmetric parameters which define the various models. We first revisit the standard Minimal Supersymmetric Standard Model, concluding that sneutrinos are marginally compatible with existing experimental bounds, including direct detection, provided they compose a subdominant component of dark matter. We then study supersymmetric models with the inclusion of right-handed fields and lepton-number violating terms. Simple versions of the lepton-number-violating models do not lead to phenomenology different from the standard case when the neutrino mass bounds are properly included. On the contrary, models with right-handed fields are perfectly viable: they predict sneutrinos which are compatible with the current direct detection sensitivities, both as subdominant and dominant dark matter components. We also study the indirect detection signals for such successful models: predictions for antiproton, antideuteron and gamma-ray fluxes are provided and compared with existing and future experimental sensitivities. The neutrino flux from the center of the Earth is also analyzed.