Simplified R-Symmetry Breaking and Low-Scale Gauge Mediation

TL;DR

This paper introduces a simplified approach to R-symmetry breaking in low-scale gauge mediation models, resolving key issues by involving multiple fields, leading to explicit, testable models with very light gravitinos.

Contribution

It proposes a new framework where supersymmetry and R-symmetry breaking are shared between two fields, simplifying model construction and solving previous challenges.

Findings

Models achieve low gravitino mass in the eV range.

Explicit, calculable gauge mediation models are constructed.

The approach is falsifiable and addresses gaugino mass issues.

Abstract

We argue that some of the difficulties in constructing realistic models of low-scale gauge mediation are artifacts of the narrow set of models that have been studied. In particular, much attention has been payed to the scenario in which the Goldstino superfield in an O'Raifeartaigh model is responsible for both supersymmetry breaking and R-symmetry breaking. In such models, the competing problems of generating sufficiently massive gauginos while preserving an acceptably light gravitino can be quite challenging. We show that by sharing the burdens of breaking supersymmetry and R-symmetry with a second field, these problems are easily solved even within the O'Raifeartaigh framework. We present explicit models realizing minimal gauge mediation with a gravitino mass in the eV range that are both calculable and falsifiable.