Search for CP Violation in Neutrino and Antineutrino Oscillations by the T2K Experiment with 2.2×1021 Protons on Target

Authors

K. Abe, The University of Tokyo
R. Akutsu, The University of Tokyo
A. Ali, Università degli Studi di Padova
J. Amey, Imperial College London
C. Andreopoulos, University of Liverpool
L. Anthony, University of Liverpool
M. Antonova, Universitat de València
S. Aoki, Kobe University
A. Ariga, University of Bern
Y. Ashida, Kyoto University
Y. Azuma, Osaka City University
S. Ban, Kyoto University
M. Barbi, University of Regina
G. J. Barker, University of Warwick
G. Barr, University of Oxford
C. Barry, University of Liverpool
M. Batkiewicz, Henryk Niewodniczanski Institute of Nuclear Physics of the Polish Academy of Sciences
F. Bench, University of Liverpool
V. Berardi, Politecnico di Bari
S. Berkman, The University of British Columbia
R. M. Berner, University of Bern
L. Berns, Tokyo Institute of Technology
S. Bhadra, York University
S. Bienstock, Université de Paris
A. Blondel, Université de Genève
S. Bolognesi, Institut de Recherche sur les Lois Fondamentales de l'Univers
B. Bourguille, Institut de Física d'Altes Energies, Bellaterra
S. B. Boyd, University of Warwick

Document Type

Article

Publication Date

10-24-2018

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)×1020 protons on target in the neutrino (antineutrino) mode, 89 νe candidates and seven anti-νe candidates are observed, while 67.5 and 9.0 are expected for δCP=0 and normal mass ordering. The obtained 2σ confidence interval for the CP-violating phase, δCP, does not include the CP-conserving cases (δCP=0, π). The best-fit values of other parameters are sin2θ23=0.526-0.036+0.032 and Δm322=2.463-0.070+0.071×10-3 eV2/c4.

Publication Source (Journal or Book title)

Physical Review Letters

Recommended Citation

Abe, K., Akutsu, R., Ali, A., Amey, J., Andreopoulos, C., Anthony, L., Antonova, M., Aoki, S., Ariga, A., Ashida, Y., Azuma, Y., Ban, S., Barbi, M., Barker, G., Barr, G., Barry, C., Batkiewicz, M., Bench, F., Berardi, V., Berkman, S., Berner, R., Berns, L., Bhadra, S., Bienstock, S., Blondel, A., Bolognesi, S., Bourguille, B., & Boyd, S. (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) https://doi.org/10.1103/PhysRevLett.121.171802