Prospects for the detection of heavy charginos and neutralinos with the ATLAS detector at the LHC

The high cross-section for squark and gluino production at the LHC allows to search for rare cascade decays of the squarks, thus giving access to a large spectrum of SUSY sparticles. In the framework of minimal SUGRA we investigate the possibility of detecting the heavier gaugino states $\tchi^0_4$ and $\tchi^\pm_2$ through their decays to sleptons. The characteristic final state signature of two leptons with opposite sign and same flavour allows to discriminate the signal from the dominant SUSY background, yielding a significant reach in the mSUGRA parameter space.\par The shape of the observed signal can be used to extract a measurement of the masses of the heavier gauginos.