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
Journal ISSN
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
.
Description
Keywords
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.