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Search for top squark pair production using dilepton final states in collision data collected at .

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Area of Science:

  • High-energy physics
  • Particle physics
  • Supersymmetry searches

Background:

  • Searches for new physics beyond the Standard Model are crucial.
  • Supersymmetry (SUSY) predicts top squarks as partners of top quarks.
  • Top squarks could be produced in proton-proton collisions.

Purpose of the Study:

  • To search for top squarks in a specific final state at the CMS detector.
  • To set exclusion limits on the masses of top squarks and associated supersymmetric particles.
  • To test simplified supersymmetric models.

Main Methods:

  • Analysis of proton-proton collision data at a center-of-mass energy of 13 TeV.
  • Selection of events with two opposite-sign leptons, b-jets, and significant missing transverse momentum.
  • Utilizing transverse mass and missing transverse momentum significance for background rejection.

Main Results:

  • No significant excess of events beyond the Standard Model background was observed.
  • Exclusion limits were placed on the masses of top squarks and neutralinos.
  • Limits were derived for different decay scenarios of the top squark.

Conclusions:

  • The search found no evidence for top squarks in the analyzed data.
  • Exclusion limits were established for top squark masses up to 925 GeV and neutralino masses up to 450 GeV in simplified models.
  • Further constraints were placed on supersymmetric models based on the non-observation of signal.