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.
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
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Pre-published on:
June 16, 2020
Published on:
November 12, 2020
Abstract
DOI: https://doi.org/10.22323/1.364.0623
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Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.