Search for Electroweak Production of Charginos and Neutralinos in Multileptonic Final States with the ATLAS Experiment

Supersymmetry, or SUSY, is one of the proposed extensions to the Standard Model, representing a solution to some of its limitations, such as the hierarchy problem. It introduces new particle states which may be produced at the ATLAS experiment, which has been taking data at $\sqrt{s}$~=~13~TeV at the Large Hadron Collider (LHC). Due to existing constraints on the value of the masses of strongly coupled SUSY particles (or "sparticles"), the electroweak production of weakly interacting sparticles may become the key mechanism to search for beyond-the-Standard-Model physics at the LHC. A search for electroweak production of charginos and neutralinos decaying to multileptonic final states using Run~2 data collected with the ATLAS experiment is presented. Results are interpreted is the context of simplified models in which charginos and neutralinos undergo R-parity-conserving decays via intermediate production of gauge and Higgs bosons.