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

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. The analysis is performed by using the full Run-2 data sample - corresponding to an integrated luminosity $L=139\,fb^{-1}$ - collected with the ATLAS experiment. Results are interpreted in the context of an $R$-parity-conserving simplified model in which charginos and neutralinos decay via the intermediate production of $W$ and $Z$ bosons or $W$ and Higgs ($h$) bosons. The new results significantly extend published constraints on relevant sparticle masses.