Goldstini and the Z-peaked ATLAS excess

by Alberto Mariotti (VUB Brussels)

Thursday 29 Oct 2015, 14:00 → 15:00 Europe/Zurich

4/2-011 - TH common room (CERN)

I will first review the 3-sigma Z-peaked excess recently reported by the ATLAS collaboration and its possible interpretation in supersymmetric models. I will then discuss basic aspects of scenarios with multiple supersymmetry breaking sectors in gauge mediation. In particular I will explain how the low energy spectrum presents in this case extra light fermionic degrees of freedom, the pseudo-goldstini. I will derive their radiatively induced mass and describe their interactions with the MSSM particles. I will then show how a simplified model in the MSSM with pseudo-goldstini can accommodate the Z-peaked ATLAS excess without conflicting with other existing LHC searches.