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This paper discusses the ATLAS potential to study Supersymmetry for the"Focus-Point" region of the parameter space of mSUGRA models. The potential todiscovery a deviation from Standard Model expectations with the first few${fb}^{-1}$ of LHC data was studied using the parametrized simulation of theATLAS detector. Several signatures were considered, involving hard jets, largemissing energy, and either $b$-tagged jets, opposite-sign isolated electron ormuon pairs, or top quarks reconstructed exploiting their fully hadronic decays.With only 1 ${fb}^{-1}$ of data each of these signatures may allow to observean excess of events over Standard Model expectation with a statisticalsignificance exceeding 5 standard deviations. An analytical expression wasderived for the shape of the distribution of the dilepton invariant massarising from the three-body leptonic decay of the neutralinos under thehypothesis of heavy scalars, which is appropriate for the focus-point scenario.The resulting function was used to fit the distribution of the dileptoninvariant mass obtained with simulated LHC data, and to extract the value oftwo kinematic endpoints measuring the $\tilde \chi^0_2 - \tilde \chi^0_1$ andthe $\tilde \chi^0_3 - \tilde \chi^0_1$ mass differences. This information wasused to constrain the MSSM parameter space compatible with the data.

Perspectives for the detection and measurement of Supersymmetry in the focus point region of mSUGRA models with the ATLAS detector at LHC