Search for Supersymmetry in final states with two same-sign leptons, jets and missing transverse momentum with the ATLAS detector in pp collisions at sqrt{s}=8 TeV

A search for the production of supersymmetric particles decaying into final states with jets, missing transverse momentum and two isolated leptons, e or mu, of same sign is presented. The analysis uses a data sample collected during the first half of 2012 that corresponds to a total integrated luminosity of 5.8 fb-1 of sqrt{s}=8 TeV proton-proton collisions recorded with the ATLAS detector at the Large Hadron Collider. No deviation from the Standard Model expectation is observed. Exclusion limits are derived in simplified models in Supersymmetry where the gluino decays via a top squark into t tbar chi01. In those models, gluino masses below 800-- 890 GeV are excluded for neutralino masses up to 360 GeV. In a MSUGRA/CMSSM model, m_{1/2} values are excluded below 270 -- 420 GeV for m_0 values up to 3 TeV.