Neutralino Dark Matter in the USSM

TL;DR

This paper explores how extending supersymmetric models with additional Higgs and gauge bosons affects neutralino dark matter properties, including relic abundance and detection prospects.

Contribution

It derives Feynman rules and calculates dark matter relic abundance and detection rates in the USSM, highlighting differences from minimal models.

Findings

USSM states significantly alter neutralino dark matter characteristics

Relic abundance calculations show notable deviations from minimal models

Direct detection rates vary substantially in the extended model

Abstract

This paper provides a comprehensive discussion of neutralino dark matter within classes of extended supersymmetric models referred to as the USSM containing one additional SM singlet Higgs plus an extra $Z'$, together with their superpartners the singlino and bino'. These extra states of the USSM can significantly modify the nature and properties of neutralino dark matter relative to that of the minimal (or even next-to-minimal) supersymmetric standard models. We derive the Feynman rules for the USSM and calculate the dark matter relic abundance and direct detection rates for elastic scattering in the USSM for interesting regions of parameter space where the largest differences are expected.