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Natural supersymmetry suggests a light top squark, possibly within the discovery reach of the LHC. These proceedings presents the latest result of an analysis targeting a compressed region of the top squark phase space where the mass difference between the top squark and the lightest neutralino is smaller than the top-quark mass, using pp collision data recorded by the ATLAS detector over the full Run 2 of the LHC. A machine learning technique was employed in the analysis to improve the discrimination of signals from backgrounds dominated by the tt̄ process. No significant deviation from the predicted Standard Model background is observed, and limits at 95% confidence level on the supersymmetric benchmark model are set, excluding top squark masses up to 720 GeV with neutralino masses up to 580 GeV.

Search for direct top squark pair production in the 3-body decay mode with one-lepton final states in √s=13 TeV pp collisions with the ATLAS detector