Probing CP Violation with Neutrino Disappearance Alone.

Area of Science:

• Particle Physics
• Neutrino Physics
• CP Violation

Background:

• Probing CP violation in the lepton sector is crucial for understanding matter-antimatter asymmetry.
• Long-baseline neutrino experiments, particularly in appearance mode, are the current standard for this investigation.

Purpose of the Study:

• To explore the feasibility of discovering CP violation using only neutrino disappearance measurements.
• To assess the potential of combining data from electron neutrino and muon neutrino disappearance experiments.

Main Methods:

• Utilizing data from the JUNO experiment for electron neutrino disappearance.
• Combining JUNO data with simulated data from DUNE or Hyper-Kamiokande for muon neutrino disappearance.
• Analyzing combined datasets to determine sensitivity to CP violation.

Main Results:

• Demonstrated that CP violation can be discovered solely through disappearance experiments.
• Achieved a maximum sensitivity of 1.6σ for CP violation discovery with 6 years of JUNO and 13 years of DUNE data.
• Showed that certain CP-violating phase values (δ) can be disfavored by >3σ.

Conclusions:

• Neutrino disappearance experiments, when combined, offer a viable alternative for probing CP violation.
• This approach provides complementary insights to traditional appearance mode experiments.
• Future analyses can refine sensitivity and explore a wider range of CP-violating parameters.