Collider signatures of goldstini in gauge mediation

TL;DR

This paper explores how multiple goldstini in gauge mediation models produce distinctive collider signatures, especially through LOSP decays into pseudo-goldstini, leading to unique final state spectra.

Contribution

It introduces the collider phenomenology of models with multiple goldstini, focusing on LOSP decays and their distinctive signatures compared to standard gauge mediation.

Findings

LOSP decay modes into pseudo-goldstini can be significant.

Final state spectra are softer and more structured than in standard gauge mediation.

Characteristic signatures depend on LOSP type and pseudo-goldstino mass.

Abstract

We investigate the collider signatures of the multiple goldstini scenario in the framework of gauge mediation. This class of models is characterized by a visible sector (e.g. the MSSM or any extension) coupled by gauge interactions to more than one SUSY breaking sector. The spectrum consists of a light gravitino LSP, behaving as a goldstino, and a number of neutral fermions (the pseudo-goldstini) with a mass between that of the LSP and that of the lightest particle of the observable sector (LOSP). We consider the two situations where the LOSP is either a gaugino-like neutralino or a stau and we assume only one pseudo-goldstino of a mass of O(100) GeV. The coupling of the LOSP to the pseudo-goldstino can be enhanced with respect to those of the gravitino giving rise to characteristic signatures. We show that the decay modes of the LOSP into a SM particle and a pseudo-goldstino can be significant. For both LOSP scenarios we analyze (pseudo)-goldstini production at colliders. Compared to standard gauge mediation the final state spectrum is softer and more structured.