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Multilepton and multiphoton signatures of supersymmetry at the LHC

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If you have a question about this talk, please contact Damien George .

Motivated by the absence of any clear signal of physics beyond the Standard Model (SM) at the LHC after Run 1, I will discuss one possible slight hint of new physics and one non-minimal extension of the SM. In the first part of the talk I will provide a tentative explanation of a small excess of multilepton events, observed by the CMS collaboration, by means of a simplified model of gauge mediated supersymmetry breaking (GMSB). In the second part of the talk I will discuss how the standard phenomenology of GMSB can be significantly modified by the non-minimal assumption that supersymmetry is broken in more than one hidden sector. Multiple hidden sectors give rise to light neutral fermions called pseudo-goldstini and due to the extra decay steps they give rise to, where soft photons are emitted, these models give rise to multiphoton plus missing energy signatures. I will compare against existing LHC searches and propose new searches designed to probe these models.

This talk is part of the HEP phenomenology joint Cavendish-DAMTP seminar series.

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