Aspects of Non-minimal Gauge Mediation

TL;DR

This paper studies non-minimal gauge mediation models predicting mass hierarchies between gauginos and scalars, analyzing their phenomenology, cosmological constraints, and collider signals, highlighting differences from minimal models.

Contribution

It provides a comprehensive analysis of semi-direct gauge mediation, including mass calculations and phenomenological implications, emphasizing the breaking of GUT relations and NLSP diversity.

Findings

Mass hierarchies between gauginos and scalars are predicted.

GUT relation of gaugino masses is broken in these models.

Gluino NLSP scenarios relax cosmological constraints.

Abstract

A large class of non-minimal gauge mediation models, such as (semi-)direct gauge mediation, predict a hierarchy between the masses of the supersymmetric standard model gauginos and those of scalar particles. We perform a comprehensive study of these non-minimal gauge mediation models, including mass calculations in semi-direct gauge mediation, to illustrate these features, and discuss the phenomenology of the models. We point out that the cosmological gravitino problem places stringent constraints on mass splittings, when the Bino is the NLSP. However, the GUT relation of the gaugino masses is broken unlike the case of minimal gauge mediation, and an NLSP other than the Bino (especially the gluino NLSP) becomes possible, relaxing the cosmological constraints. We also discuss the collider signals of the models.