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Searches for strong production of supersymmetric particles with the ATLAS detector

Matteo Greco

TL;DR

The ATLAS SUSY search program investigates strong-production signatures across Run 2 and Run 3 data, targeting stop, charm/top squark, and gluino production with diverse decay topologies. It employs a mix of resolved/boosted topologies, flavor tagging (including $c$-tagging), ISR-based strategies, and multivariate discriminants (NN/BDT) alongside recursive jigsaw reconstruction in select regions. Across five analyses, no significant deviations from the Standard Model are observed, yielding stringent 95% CL exclusions such as $m(\tilde{t}_1) \approx 1.23$ TeV for a massless $\tilde{\chi}_1^0$, $m(\tilde{g}) \approx 2.25$ TeV, and $m(\tilde{t}_1) \approx m(\tilde{c}_1) \approx 0.9$ TeV in specific channels. These results substantially constrain natural and non-minimal SUSY scenarios, guiding future LHC searches and shaping the remaining viable parameter space for strongly produced sparticles.

Abstract

Supersymmetry (SUSY) provides elegant solutions to several open questions in the Standard Model, and searches for SUSY particles are an important component of the LHC physics program. Naturalness arguments favour supersymmetric partners of the gluons and third-generation quarks with masses light enough to be produced at the LHC. With increasing mass bounds on more classical Minimal Supersymmetric Standard Model (MSSM) scenarios other variations of supersymmetry, including non-minimal particle content, become increasingly interesting. This proceeding will present the latest results of searches conducted by the ATLAS experiment at LHC at center of mass energies of $\sqrt{s}=13$ and 13.6 TeV which target gluino and squark production, including stop, in a variety of decay modes.

Searches for strong production of supersymmetric particles with the ATLAS detector

TL;DR

The ATLAS SUSY search program investigates strong-production signatures across Run 2 and Run 3 data, targeting stop, charm/top squark, and gluino production with diverse decay topologies. It employs a mix of resolved/boosted topologies, flavor tagging (including -tagging), ISR-based strategies, and multivariate discriminants (NN/BDT) alongside recursive jigsaw reconstruction in select regions. Across five analyses, no significant deviations from the Standard Model are observed, yielding stringent 95% CL exclusions such as TeV for a massless , TeV, and TeV in specific channels. These results substantially constrain natural and non-minimal SUSY scenarios, guiding future LHC searches and shaping the remaining viable parameter space for strongly produced sparticles.

Abstract

Supersymmetry (SUSY) provides elegant solutions to several open questions in the Standard Model, and searches for SUSY particles are an important component of the LHC physics program. Naturalness arguments favour supersymmetric partners of the gluons and third-generation quarks with masses light enough to be produced at the LHC. With increasing mass bounds on more classical Minimal Supersymmetric Standard Model (MSSM) scenarios other variations of supersymmetry, including non-minimal particle content, become increasingly interesting. This proceeding will present the latest results of searches conducted by the ATLAS experiment at LHC at center of mass energies of and 13.6 TeV which target gluino and squark production, including stop, in a variety of decay modes.
Paper Structure (5 sections, 6 figures)

This paper contains 5 sections, 6 figures.

Table of Contents

  1. Introduction
  2. Search for $\tilde{t}_1$$\tilde{t}_1$ pairs in $tt$+$E_{\text{T}}^{\text{miss}}$ final states
  3. Search for $\tilde{t}_1$$\tilde{t}_1$ pairs in $tc$+$E_{\text{T}}^{\text{miss}}$ final states
  4. Search for $\tilde{t}_1$$\tilde{t}_1$ and $\tilde{c}_1$$\tilde{c}_1$ pairs in $cc$+$E_{\text{T}}^{\text{miss}}$ final states
  5. Gluinos and squarks pair production

Figures (6)

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