Patterns of Gauge Mediation in Metastable SUSY Breaking

TL;DR

This paper explores how different mechanisms of R-symmetry breaking in metastable SUSY models influence gauge mediation and the resulting MSSM particle spectrum, highlighting the importance of hidden sector dynamics.

Contribution

It analyzes the impact of explicit versus spontaneous R-symmetry breaking on gauge mediation and MSSM phenomenology, providing benchmark models for each scenario.

Findings

Explicit R-symmetry breaking leads to standard gauge mediation with high tan(beta).

Spontaneous R-symmetry breaking results in suppressed R-violating soft terms and large scalar masses.

Hidden sector dynamics significantly influence the MSSM mass spectrum.

Abstract

Supersymmetry breaking in a metastable vacuum allows one to build simple and concrete models of gauge mediation. Generation of gaugino masses requires that R-symmetry be broken in this vacuum. In general, there are two possible ways to break R-symmetry, explicitly or spontaneously. We find that the MSSM phenomenology depends crucially on how this breaking occurs in the Hidden Sector. Explicit R-symmetry breaking models can lead to fairly standard gauge mediation, but we argue that in the context of ISS-type models this only makes sense if B=0 at the mediation scale, which leads to high tan(beta). If on the other hand, R-symmetry is broken spontaneously, then R-symmetry violating soft terms tend to be suppressed with respect to R-symmetry preserving ones, and one is led to a scenario with large scalar masses. These models interpolate between standard gauge mediation and split SUSY models. We provide benchmark points for the two scenarios. They demonstrate that the specific dynamics of the Hidden Sector -- the underlying nature of supersymmetry and R-symmetry breaking -- affects considerably the mass spectrum of the MSSM, and vice versa.