Search for new physics in high pT like-sign dilepton events at CDF II

Area of Science:

• High Energy Physics
• Particle Physics
• Beyond Standard Model Physics

Background:

• The Standard Model (SM) of particle physics describes fundamental particles and forces.
• Searches for physics beyond the SM are crucial for understanding the universe.
• Doubly charged scalar particles are predicted by some extensions to the SM.

Purpose of the Study:

• To search for new physics phenomena in events featuring two high transverse momentum (pT) leptons of the same electric charge.
• To constrain the properties of hypothetical doubly charged scalar particles (H±±).

Main Methods:

• Analysis of proton-proton collision data collected by a particle detector.
• Integrated luminosity of 6.1 fb⁻¹ was used.
• Selection of events with two high pT leptons carrying the same charge (electrons or muons).

Main Results:

• Observed data are in agreement with Standard Model predictions.
• No significant excess of events attributable to new physics was detected.
• Exclusion limits are placed on the mass of doubly charged scalars (H±±).

Conclusions:

• The search for new physics in same-sign dilepton final states yielded results consistent with the Standard Model.
• Lower limits on the mass of doubly charged scalars decaying to electron-electron, muon-muon, or electron-muon pairs were established at 95% confidence level, ranging from 190 to 245 GeV/c².