Large CP violation in charmed baryon decays

Area of Science:

• Particle Physics
• Quantum Chromodynamics
• Cosmic Microwave Background

Background:

• CP violation is crucial for understanding matter-antimatter asymmetry.
• Charmed baryon decays are a promising, yet underexplored, sector for CP violation studies.

Purpose of the Study:

• To provide the first detailed numerical predictions for CP violation in antitriplet charmed baryon decays.
• To explore the potential for observing CP violation in this specific class of particle decays.

Main Methods:

• Utilizing flavor SU(3)_F symmetry to connect CKM-suppressed and leading amplitudes.
• Employing the final state re-scattering framework to model decay processes.
• Relating amplitudes using parameters proportional to λ_b and λ_d.

Main Results:

• Predicted CP violation magnitudes of the order of 10^-3.
• Observed CP violation comparable to that in D⁰→π⁺π^- and K⁺K^- decays.
• Identified significant CP violation effects in antitriplet charmed baryon decays.

Conclusions:

• Charmed baryon decays present a viable new avenue for observing CP violation.
• These findings provide crucial tests for the Standard Model of particle physics.
• The predicted CP violation levels warrant experimental investigation.