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Researchers propose a new method using soft microdisplaced tracks to detect Higgsinos, a type of supersymmetric particle, in an unexplored mass region. This strategy could reveal Higgsinos at the Large Hadron Collider (LHC).

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Area of Science:

  • Particle Physics
  • High Energy Physics
  • Supersymmetry Searches

Background:

  • Higgsino particles are a key target in Large Hadron Collider (LHC) experiments.
  • An unexplored region exists beyond the LEP Higgsino mass limit with specific mass splittings (0.3-1 GeV) between neutral and charged Higgsinos.
  • This mass spectrum is predicted by many supersymmetric models and is currently unprobed by existing search strategies.

Purpose of the Study:

  • To propose a novel search strategy for Higgsinos in the currently uncharted mass region.
  • To address the gap in experimental searches for Higgsinos with small mass splittings.
  • To enhance the sensitivity of LHC experiments to specific supersymmetric particle scenarios.

Main Methods:

  • Utilizing a soft microdisplaced track signature in conjunction with monojet event selection.
  • Developing a method to discriminate Higgsino decay signals from Standard Model backgrounds.
  • Analyzing data from LHC Run2 and High-Luminosity LHC (HL-LHC) upgrades.

Main Results:

  • The proposed strategy is sensitive to Higgsino masses up to approximately 180 GeV (LHC Run2) and 250 GeV (HL-LHC).
  • This sensitivity is achieved for a charged-neutral Higgsino mass splitting of around 0.5 GeV.
  • The method effectively distinguishes Higgsino signals from background noise.

Conclusions:

  • The new search strategy effectively probes the unexplored Higgsino mass region.
  • This approach significantly enhances the potential for discovering Higgsinos at the LHC.
  • The findings have important implications for supersymmetry model building and experimental searches.