Measurements from Supersymmetric Events

We review the techniques used to reconstruct the decay of supersymmetric particles and measure their properties with ATLAS at the LHC, concentrating on strategies to be applied to a data set of integrated luminosity of 1 fb^-1 that can be expected after the first year of operation of the LHC. These techniques are illustrated using several benchmark points chosen in the mSUGRA parameter space, but they are applicable to a broader range of supersymmetric (and other similar) models. The most appropriate methods will be selected and fine-tuned once (and if) signatures consistent with Supersymmetry are established. Supersymmetric cascade decays typically have large transverse missing energy due to the presence of undectected neutralinos, and have characteristic edges and thresholds in the dilepton, dijet and lepton-jet invariant mass distributions. The reconstruction of such edges is the focus of the first part of the paper. The second part of the paper concentrates on the reconstruction of more specific decay channels, involving light stops, staus and Higgs bosons. The final section indicates how sparticle masses and other supersymmetric parameters could be constrained using such measurements.