Dark matter and Collider signals in supersymmetric $U(1)^\prime$ models with non-universal $Z^\prime$ couplings

Understand

We analyse supersymmetric models augmented by an extra $U(1)$ gauge group.

• To avoid anomalies in these models without introducing exotics, we allow for family-dependent $U(1)^\prime$ charges, and choose a simple form for these, dependent on one $U(1)^\prime$ charge parameter only.
• With this choice, $Z^\prime$ decays into di-taus but not di-leptons, weakening considerably the constraints on its mass.
• In the supersymmetric sector, the effect is to lower the singlino mass, allowing it to be the dark matter candidate.