Search for long-lived charginos based on a disappearing-track signature in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector

CERN-LHC. This paper presents a search for direct electroweak gaugino or gluino pair production with a chargino nearly mass-degenerate with a stable neutralino. It is based on an integrated luminosity of 36.1 fb$^{-1}$ of $pp$ collisions at $\sqrt{s}$ = 13 TeV collected by the ATLAS experiment at the LHC. The final state of interest is a disappearing track accompanied by at least one jet with high transverse momentum from initial-state radiation or by four jets from the gluino decay chain. The use of short track segments reconstructed from the innermost tracking layers significantly improves the sensitivity to short chargino lifetimes. The results are found to be consistent with Standard Model predictions. Exclusion limits are set at 95% confidence level on the mass of charginos and gluinos for different chargino lifetimes. For a pure wino with a lifetime of about 0.2 ns, chargino masses up to 460 GeV are excluded. For the strong production channel, gluino masses up to 1.65 TeV are excluded assuming a chargino mass of 460 GeV and lifetime of 0.2 ns. For the strong production channel, gluino masses up to 1.65 TeV are excluded assuming a chargino mass of 460 GeV and lifetime of 0.2 ns.

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Imported on November 17, 2025
Last update November 17, 2025
Keywords
  • cmenergies: 13000.0-13000.0
  • observables: ACCEFF
  • observables: Cross-section upper limits
  • observables: N
  • observables: Upper limits
  • observables: Efficiency
  • observables: Exclusion limit
  • observables: Cutflow
  • observables: ACC
  • observables: Systematic uncertainties
  • SUSY
  • Supersymmetry
  • Disappearing Track
  • Proton-Proton Scattering
  • P P --> GLUINO GLUINO X
  • P P --> GAUGINO GAUGINO X
Defined In https://doi.org/10.1007/JHEP06(2018)022
Author Morad Aaboud
More Authors
Georges Aad
Brad Abbott
Ovsat Abdinov
Baptiste Abeloos
Syed Haider Abidi
Ossama AbouZeid
Nicola Abraham
Halina Abramowicz
Henso Abreu
Repository Name INSPIRE-HEP
Source Creation February 17, 2025
Source Modified March 26, 2025
Language Deutsch
Publication Year 2017-12-11