Fabio Cardillo - Search for supersymmetry in events with two same-sign leptons or three leptons with the ATLAS detector at √s = 13 TeV

Supersymmetry is one of the most studied theories to extend the Standard Model of particles physics. In many supersymmetric models the lightest supersymmetric particle is stable. This particle can be a suitable candidate for dark matter. This talk presents a search for supersymmetric phenomena in final states with two leptons of the same charge or three leptons and jets.

While this event signature is present in different supersymmetric scenarios, SM processes leading to such events have normally very small cross-sections. Therefore, this analysis benefits from a small background in the signal regions leading to a good sensitivity especially in SUSY scenarios with compressed mass spectra. The search was performed with the full dataset collected with the ATLAS detector during the years 2015 and 2016 corresponding to a total integrated luminosity of 36.1 fb-1. No significant excess above the SM prediction is observed. The sensitivity to a big variety of supersymmetric models is illustrated by the interpretation of the results in the context of different SUSY benchmark scenarios.