On the Suppression of the Dark Matter-Nucleon Scattering Cross Section in the SE$_6$SSM

TL;DR

This paper explores a modified E6-inspired supersymmetric model where dark matter consists of gravitino and neutral exotic fermion, resulting in a suppressed dark matter-nucleon scattering cross section below current experimental limits.

Contribution

It introduces a new variant of the SE6SSM with dual dark matter candidates that significantly reduces the scattering cross section compared to previous models.

Findings

Dark matter-nucleon cross section is below current experimental limits.

The model supports two dark matter candidates: gravitino and neutral exotic fermion.

Suppression of scattering cross section is achieved through specific model modifications.

Abstract

In the E6 inspired $U(1)_N$ extension of the minimal supersymmetric (SUSY) standard model (MSSM) a single discrete $\tilde{Z}^{H}_2$ symmetry permits suppressing rapid proton decay and non-diagonal flavour transitions. If matter parity and $\tilde{Z}^{H}_2$ symmetry are preserved this SUSY model (SE4-6$SSM) may involve two dark matter candidates. In this article we study a new modification of the SE6SSM in which the cold dark matter is composed of gravitino and the lightest neutral exotic fermion. We argue that in this case the dark matter-nucleon scattering cross section can be considerably smaller than the present experimental limit.