Sneutrino Dark Matter via pseudoscalar X-funnel meets Inverse Seesaw

TL;DR

This paper explores sneutrino dark matter within an inverse seesaw model, highlighting the role of a pseudoscalar mediator in annihilation processes and demonstrating compatibility with current detection constraints.

Contribution

It introduces a novel mechanism where a pseudoscalar X-funnel enables sneutrino annihilation, providing analytic formulas and parameter estimates for this process.

Findings

Sneutrino dark matter can efficiently annihilate via the pseudoscalar X-funnel.

Direct detection cross section is well below current experimental limits.

Indirect detection signals are close to current observational bounds.

Abstract

In this paper we study sneutrino dark matter in a recently proposed supersymmetric electroweak-scale inverse seesaw model, in which the majority of the sneutrino dark matter particle is a mixture of the right-handed sneutrino $\tilde{N}^c$ and the singlet field $\tilde{S}$. The scalar field $X$ responsible for the generation of neutrino masses can simultaneously play a crucial role for sneutrino annihilation in the early Universe via the pseudoscalar mediator $A_X$ into neutrinos. We focus here on the dominant annihilation channels and provide all the formulas together with analytic estimates in order to identify the relevant parameters. Furthermore, we show that the direct detection scattering cross section is many orders of magnitude below the current limits, and estimate the indirect detection annihilation rate, which is only a few orders of magnitude below the current limits.