PoS - Proceedings of Science
Volume 364 - European Physical Society Conference on High Energy Physics (EPS-HEP2019) - Searches for New Physics
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
Z.P. Arrubarrena Tame*  on behalf of the ATLAS Collaboration
Full text: pdf
Pre-published on: June 16, 2020
Published on: November 12, 2020
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 $t\bar{t}$ 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.
DOI: https://doi.org/10.22323/1.364.0623
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