Searching for Supersymmetry with two same-sign leptons, multi-jets plus missing transverse energy in ATLAS at sqrt{s}= 10 TeV

A search for R-parity conserving supersymmetry using the ATLAS detector is presented. The final state under study includes two same-charge leptons, two jets, and missing transverse energy. We propose a data-driven method to estimate the number of Standard Model background events, and its discovery potential is assessed assuming an integrated luminosity of 200 pb$^{-1}$ and a center of mass energy of 10 TeV.