Gravitino Dark Matter and general neutralino NLSP

TL;DR

This paper investigates gravitino dark matter with various neutralino NLSPs, analyzing decay channels, BBN constraints, and collider detection prospects in a model-independent framework.

Contribution

It provides a comprehensive, model-independent analysis of gravitino DM with different neutralino NLSPs, including decay channels and experimental constraints.

Findings

BBN constraints vary for Higgsino and Wino NLSPs compared to Bino

Certain parameter space regions remain viable for gravitino DM

Potential collider signatures depend on NLSP type

Abstract

We study the scenario of gravitino DM with a general neutralino NLSP in a model independent way. We consider all neutralino decay channels and compare them with the most recent BBN constraints. We check how those bounds are relaxed for a Higgsino or a Wino NLSP in comparison to the Bino neutralino case and look for possible loopholes in the general MSSM parameter space.We determine constraints on the gravitino and neutralino NLSP mass and comment on the possibility of detecting these scenarios at colliders.