Pseudo-Goldstini in Field Theory

TL;DR

This paper investigates the properties of pseudo-Goldstini arising from two decoupled SUSY-breaking sectors, deriving a universal formula for their mass and exploring implications for collider physics and cosmology.

Contribution

The paper introduces a non-perturbative universal formula for pseudo-Goldstino mass and analyzes its implications within gauge mediation models.

Findings

Pseudo-Goldstino mass is at least around 1 GeV.

Mass can be in the electroweak range even in low scale models.

Potential for novel collider and cosmological phenomena.

Abstract

We consider two SUSY-breaking hidden sectors which decouple when their respective couplings to the visible particles are switched off. In such a scenario one expects to find two light fermions: the Goldstino and the pseudo-Goldstino. While the former remains massless in the rigid limit, the latter becomes massive due to radiative effects which we analyze from several different points of view. This analysis is greatly facilitated by a version of the Goldberger-Treiman relation, which allows us to write a universal non-perturbative formula for the mass. We carry out the analysis in detail in the context of gauge mediation, where we find that the pseudo-Goldstino mass is at least around the GeV scale and can be easily at the electroweak range, even in low scale models. This leads to interesting and unconventional possibilities in collider physics and it also has potential applications in cosmology.