Multi-Lepton Supersymmetry Searches

We investigate the potential of the ATLAS detector to discover new physics events containing three leptons and missing transverse momentum. Such final states are predicted in a variety of extensions to the Standard Model. In the context of supersymmetric models, they could result from direct production of gaugino pairs. Using Monte Carlo simulations we present the discovery potential for several benchmark Supersymmetry points. We pay particular attention to the case where all strongly interacting sparticles are heavy. We investigate trigger and reconstruction efficiencies and discuss methods for measuring various systematic uncertainties. A solid discovery is expected with an integrated luminosity of the order of several inverse fb. If coloured particles are heavy direct production of gauginos dominates. In such scenarios, discovery would require about an order of magnitude larger luminosity.