Search for the Associated Production of Charginos and Neutralinos with the D\O\ detector

A search for associated production of charginos and neutralinos is performed using data recorded with the D\O\ detector at a $p\bar p$ center-of-mass energy of 1.96 TeV at the Fermilab Tevatron Collider. This analysis considers final states with missing transverse energy and three leptons, including hadronic decays of tau leptons. With a dataset corresponding to an integrated luminosity of about 1 ${\rm fb}^{-1}$, the analysis is probing chargino masses beyond existing limits from LEP and previous Tevatron Run II analyses.