In certain Supersymmetry (SUSY) breaking scenarios, characteristic signatures can be expected which would not necessarily be found in generic SUSY searches for events containing high-pT multi-jets and large missing transverse energy. In this document, the expected response of the ATLAS detector to signatures involving high-pT photons which may or may not appear to point back to the primary collision vertex and long-lived charged sleptons and R-hadrons is presented. Such processes often have the

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... advantage of small Standard Model backgrounds and their observation could provide unique constraints on the different SUSY breaking scenarios. Using these signatures, discovery potentials are estimated for either Gauge-Mediated Supersymmetry Breaking or Split-Supersymmetry scenarios. These studies have been performed using Monte Carlo samples of SUSY and background processes corresponding to integrated luminosity of about 1 fb −1 and √ s = 14 TeV.