Search for CP Violation in Neutrino and Antineutrino Oscillations by the T2K Experiment with 2.2 × 10^21 Protons on Target

Date

2018

Authors

Abe, K.
Akutsu, R.
Ali, A.
Amey, J.
Andreopoulos, C.
Anthony, L.
Antonova, M.
Aoki, S.
Ariga, A.
Ashida, Y.

Journal Title

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Volume Title

Publisher

Physical Review Letters

Abstract

The T2K experiment measures muon neutrino disappearance and electron neutrino appearance in accelerator-produced neutrino and antineutrino beams. With an exposure of 14.7 ( 7.6 ) × 10 20 protons on target in the neutrino (antineutrino) mode, 89 ν e candidates and seven anti- ν e candidates are observed, while 67.5 and 9.0 are expected for δ C P = 0 and normal mass ordering. The obtained 2 σ confidence interval for the C P -violating phase, δ C P , does not include the C P -conserving cases ( δ C P = 0 , π ). The best-fit values of other parameters are sin 2 θ 23 = 0.52 6 + 0.032 − 0.036 and Δ m 2 32 = 2.463 + 0.071 − 0.070 × 10 − 3     eV 2 / c 4 .

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Citation

Abe, K., Akutsu, R., Ali, A., Amey, J., Andreopoulos, C., Karlen, D., … Zykova, A. (2018). Search for CP Violation in Neutrino and Antineutrino Oscillations by the T2K Experiment with 2.2×1021 Protons on Target. Physical Review Letters, 121(17), 1-9. https://doi.org/10.1103/PhysRevLett.121.171802.