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

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.