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Collider signatures of goldstini in gauge mediation

By Riccardo Argurio, Karen De Causmaecker, Gabriele Ferretti, Alberto Mariotti, Kentarou Mawatari and Yoshitaro Takaesu

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.Comment: v2: analysis of the stau LOSP scenario added, sections rearranged, and Introduction and Conclusions rewritten to include the added scenario. Version to appear in JHE

Topics: High Energy Physics - Phenomenology
Publisher: 'Springer Science and Business Media LLC'
Year: 2012
DOI identifier: 10.1007/JHEP06(2012)096
OAI identifier: oai:arXiv.org:1112.5058

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