Search for SUSY with two same-sign leptons or three leptons and jets at $\sqrt{s} = 13 \text{ TeV}$ with the ATLAS Detector

Supersymmetry (SUSY) is a well motivated extension of the Standard Model (SM) that postulates the existence of a superpartner for each SM particle. A search for strongly produced SUSY particles decaying to a pair of two isolated \textbf{same-sign leptons (SS)} or \textbf{three leptons (3L)} has been carried out using the complete data set collected by the ATLAS experiment in 2015-16 at 13 TeV ($36.5 fb^{-1}$). The analysis benefits from a low SM background and uses looser kinematic requirements compared to other beyond the SM (BSM) searches which increases its sensitivity to scenarios with small mass differences between the SUSY particles, or in which R-parity is not conserved. The results are interpreted in the context of \textbf{R-parity conserving (RPC)} or \textbf{R-parity violating (RPV)} simplified signal models