Low-scale Gauge Mediation after LHC Run 2

TL;DR

This paper evaluates low-scale gauge mediation models with very light gravitinos in light of recent LHC data, finding that many such models are now largely excluded due to collider constraints.

Contribution

It provides the first comprehensive analysis of low-scale gauge mediation models with light gravitinos considering the latest collider and cosmological bounds.

Findings

Many perturbatively calculable models are excluded by current LHC data.

Cosmological bounds significantly restrict the parameter space.

Light gravitino models face strong collider constraints.

Abstract

We study low-scale gauge mediated supersymmetry breaking models with a very light gravitino of mass $\mathcal{O}(1)$ eV. The cosmological upper bound on the gravitino mass and the collider constraints on the sparticle masses give a significant impact on such models. We apply the latest results of the LHC to these models and obtain the current constraints. We find that perturbatively calculable classes of low-scale gauge mediation models can be largely excluded.