Sub-GeV Atmospheric Neutrinos and CP Violation in DUNE

Area of Science:

• Particle Physics
• Astrophysics
• Neutrino Physics

Background:

• Studying atmospheric neutrinos provides insights into fundamental particle physics.
• Liquid argon time projection chambers offer unique capabilities for detecting low-energy events.

Purpose of the Study:

• To utilize liquid argon time projection chambers for sub-GeV atmospheric neutrino analysis.
• To determine the leptonic CP-violating phase (δCP) using atmospheric neutrinos.
• To explore the impact of sub-GeV atmospheric neutrino flux on other physics areas.

Main Methods:

• Employing the event topology and reconstruction capabilities of liquid argon time projection chambers.
• Detecting low-energy recoiled protons to measure neutrino interactions.
• Analyzing sub-GeV atmospheric neutrino data.

Main Results:

• The proposed analysis can exclude a range of δCP values beyond the 3σ level.
• This method provides a determination of δCP independent of accelerator neutrino measurements.

Conclusions:

• Sub-GeV atmospheric neutrinos offer a novel avenue for probing CP violation in the lepton sector.
• Accurate determination of atmospheric neutrino flux has implications for supernova neutrino detection and dark matter searches.