Measurement of Muon Antineutrino Oscillations with an Accelerator-Produced Off-Axis Beam
Date
2016
Authors
Abe, K.
Andreopoulos, C.
Antonova, M.
Aoki, S.
Ariga, A.
Assylbekov, S.
Autiero, D.
Barbi, M.
Barker, G.J.
Barr, G.
Journal Title
Journal ISSN
Volume Title
Publisher
Physical Review Letters
Abstract
T2K reports its first measurements of the parameters governing the disappearance of
¯
ν
μ
in an off-axis beam due to flavor change induced by neutrino oscillations. The quasimonochromatic
¯
ν
μ
beam, produced with a peak energy of 0.6 GeV at J-PARC, is observed at the far detector Super-Kamiokande, 295 km away, where the
¯
ν
μ
survival probability is expected to be minimal. Using a data set corresponding to
4.01
×
10
20
protons on target, 34 fully contained
μ
-like events were observed. The best-fit oscillation parameters are
sin
2
(
¯
θ
23
)
=
0.45
and
|
Δ
¯
m
2
32
|
=
2.51
×
10
−
3
eV
2
with 68% confidence intervals of
0.38
–
0.64
and
2.26
–
2.80
×
10
−
3
eV
2
, respectively. These results are in agreement with existing antineutrino parameter measurements and also with the
ν
μ
disappearance parameters measured by T2K.
Description
Keywords
Citation
Abe, K., Andreopoulos, C., Antonova, M., Aoki, S., Ariga, A., Karlen, D., … Żmuda, A. (2016). Measurement of Muon Antineutrino Oscillations with an Accelerator-Produced Off-Axis Beam. Physical Review Letters, 116(18), 1-8. https://doi.org/10.1103/PhysRevLett.116.181801.