Dark Matter in a Constrained $E_6$ Inspired SUSY Model

Understand

We investigate dark matter in a constrained $E_6$ inspired supersymmetric model with an exact custodial symmetry and compare with the CMSSM.

• The breakdown of $E_6$ leads to an additional $U(1)_N$ symmetry and a discrete matter parity.
• The custodial and matter symmetries imply there are two stable dark matter candidates, though one may be extremely light and contribute negligibly to the relic density.
• We demonstrate that a predominantly Higgsino, or mixed bino-Higgsino, neutralino can account for all of the relic abundance of dark matter, while fitting a 125 GeV SM-like Higgs and evading LHC limits on new states.