Search for Electroweak Production of Charginos and Sleptons Decaying into Final States with Two Leptons and Missing Transverse Momentum at LHC Run 2 with the ATLAS Detector

A search for the electroweak production of charginos and sleptons decaying into final states with two electrons and/or muons is presented. The analysis is based on 139 fb$^{–1}$ of proton-proton collision data recorded by the ATLAS experiment at the Large Hadron Collider (LHC) at $\sqrt s = 13$ TeV. Three R-parity-conserving scenarios are considered: the direct production of lightest chargino pairs with decays mediated by either W bosons or sleptons and the direct production of slepton pairs. No significant deviations from the Standard Model expectations are observed and limits at 95% Confidence Level (CL) are set on the masses of the relevant supersymmetric particles in each of these scenarios.