SUSY signatures at ATLAS

In this report recent studies made to understand the capability to discover and measure properties of supersymmetric particles with the ATLAS detector at LHC are presented. In the first part we discuss the characteristic signatures of supersymmetric models in the stau coannihilation and focus point regions of minimal Supergravity parameter space. We focus on signatures involving lepton and heavy quark invariant mass endpoints and ditau signatures involving soft taus, and identify the challenges which such signatures present for the experiment and reconstruction algorithms. In the second part we discuss the characteristic signatures of supersymmetric models with light stop squarks. We focus on heavy quark signatures and discuss the prospects for measurement of supersymmetric particle masses in different scenarios.