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This study introduces a novel method to probe CP violation in top quark and b quark physics using lepton charge identification in top-pair events. The approach offers new constraints on non-standard model physics with current and future Large Hadron Collider data.

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Area of Science:

  • High-energy particle physics
  • Quantum chromodynamics
  • Searches for new physics beyond the Standard Model

Background:

  • Top quarks are fundamental particles in the Standard Model, produced in pairs at the Large Hadron Collider.
  • CP violation is a key phenomenon in particle physics, crucial for understanding the matter-antimatter asymmetry in the universe.
  • Existing methods for probing CP violation in heavy flavor physics have limitations.

Purpose of the Study:

  • To develop and evaluate a new, independent method for measuring CP violation in top quark and b quark decays.
  • To utilize lepton charge information in semileptonic top-pair decays for CP violation studies.
  • To constrain new physics scenarios beyond the Standard Model contributing to CP violation.

Main Methods:

  • Analyzing top-pair production events with at least one semileptonic top decay at the ATLAS and CMS experiments.
  • Identifying the charge of leptons from semileptonic decays to tag the charge of the top and subsequent b quarks.
  • Constructing CP asymmetries based on same-sign and opposite-sign dilepton signatures to probe CP violation in heavy flavor mixing and decays.

Main Results:

  • The proposed method provides a novel way to probe CP violation, independent of previous experimental strategies.
  • Current and near-future Large Hadron Collider data can already be used to constrain non-standard model sources of CP violation.
  • Sensitivity estimates for two CP asymmetries based on dilepton charge combinations have been calculated.

Conclusions:

  • This research opens a new avenue for precision measurements of CP violation in b and c quark physics.
  • The method is applicable to high transverse momentum (pT) processes at the ATLAS and CMS detectors.
  • The technique has the potential to reveal new insights into the fundamental nature of CP violation.