Anomalous $U(1)'$ and Dark Matter

TL;DR

This paper investigates an anomalous $U(1)'$ extension of the MSSM, focusing on the lightest fermionic particles, particularly the XWIMP dark matter candidate, and demonstrates its compatibility with WMAP relic density data.

Contribution

It introduces a modified DarkSUSY package to analyze relic density in an anomalous $U(1)'$ extended MSSM with mixing effects, showing consistency with cosmological observations.

Findings

XWIMP can account for observed dark matter relic density.

Model remains compatible with WMAP data.

Mixing with MSSM neutralinos affects relic density calculations.

Abstract

We have studied the lightest masses in the fermionic sector of an anomalous $U(1)'$ extension of the Minimal Supersymmetric Standard Model (MSSM) inspired by brane constructions. The LSP of this model is an XWIMP (extremely weak interaction particle). We have studied its relic density in the cases in which there is mixing with the neutralinos of the MSSM and in the case in which there is not such mixing. We have showed that this extended model can satisfy the WMAP data. To perform this calculation we have modified the DarkSUSY package.