A new up-down flux ratio for sub-GeV atmospheric neutrinos enables Hyper-Kamiokande to measure the CP-violating phase with sensitivity surpassing T2HK near delta_CP of 90 and 270 degrees.
The sensitivity of liquid scintillator detectors to CP-violation with atmospheric neutrinos
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abstract
The detection of CP violation in neutrino oscillations is one of the most important goals of the next generation of neutrino experiments. Here we study the detectability of the CP-violating phase in the oscillation of atmospheric neutrinos. Liquid scintillator detectors of a few kilotons can probe the low-energy range of the atmospheric neutrino flux. We calculate the expected rate, spectrum, and zenith angle distribution for a typical liquid scintillator detector for different detector sites. We include a typical detector response with different capabilities for flavour identification and a background model. The sensitivity is estimated using a Poisson likelihood analysis.
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Towards Measuring the CP-Violating Phase with Atmospheric Neutrinos
A new up-down flux ratio for sub-GeV atmospheric neutrinos enables Hyper-Kamiokande to measure the CP-violating phase with sensitivity surpassing T2HK near delta_CP of 90 and 270 degrees.