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Collider signatures of goldstini in gauge mediation

par Argurio, Riccardo ;De Causmaecker, Karen;Mariotti, Alberto;Mawatari, Kentarou;Takaesu, Yoshitaro
Référence The journal of high energy physics (Online), 2012, 6, 96
Publication Publié, 2012-06-18

Article révisé par les pairs

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Résumé :

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 Ο(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. © 2012 SISSA.