Search for electroweak production of charginos and neutralinos in final states with three leptons and missing transverse momentum with the ATLAS experiment

Supersymmetry, or SUSY, is a viable extension to the Standard Model, and resolves important limitations latter such as those arising from the hierarchy problem. It introduces new particle states which may be produced at the ATLAS experiment 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, the electroweak production of weakly interacting sparticles may become the key mechanism to search for beyond-the-Standard-Model physics at the LHC. A new search for electroweak production of charginos and neutralinos decaying to final states with three light leptons – electrons or muons – and missing transverse momentum is presented, based on the analysis of the full Run-2 data sample collected with the ATLAS experiment. Results are interpreted is the context of R-parity-conserving simplified models in which charginos and neutralinos undergo decays via the intermediate production of W and Z bosons or W and Higgs (h) bosons. These new results significantly extend previously published constraints on relevant sparticle masses.