Improved constraints on neutrino mixing from the T2K experiment with
3.13×1021
protons on target
3.13×1021
protons on target
File(s)
Published version
Author(s)
Type
Journal Article
Abstract
The T2K experiment reports updated measurements of neutrino and antineutrino oscillations using both appearance and disappearance channels. This result comes from an exposure of
14.9
(
16.4
)
×
1
0
20
protons on target in neutrino (antineutrino) mode. Significant improvements have been made to the neutrino interaction model and far detector reconstruction. An extensive set of simulated data studies have also been performed to quantify the effect interaction model uncertainties have on the T2K oscillation parameter sensitivity. T2K performs multiple oscillation analyses that present both frequentist and Bayesian intervals for the Pontecorvo-Maki-Nakagawa-Sakata parameters. For fits including a constraint on
sin
2
θ
13
from reactor data and assuming normal mass ordering T2K measures
sin
2
θ
23
=
0.53
+
0.03
−
0.04
and
Δ
m
2
32
=
(
2.45
±
0.07
)
×
10
−
3
eV
2
c
−
4
. The Bayesian analyses show a weak preference for normal mass ordering (89% posterior probability) and the upper
sin
2
θ
23
octant (80% posterior probability), with a uniform prior probability assumed in both cases. The T2K data exclude CP conservation in neutrino oscillations at the
2
σ
level.
14.9
(
16.4
)
×
1
0
20
protons on target in neutrino (antineutrino) mode. Significant improvements have been made to the neutrino interaction model and far detector reconstruction. An extensive set of simulated data studies have also been performed to quantify the effect interaction model uncertainties have on the T2K oscillation parameter sensitivity. T2K performs multiple oscillation analyses that present both frequentist and Bayesian intervals for the Pontecorvo-Maki-Nakagawa-Sakata parameters. For fits including a constraint on
sin
2
θ
13
from reactor data and assuming normal mass ordering T2K measures
sin
2
θ
23
=
0.53
+
0.03
−
0.04
and
Δ
m
2
32
=
(
2.45
±
0.07
)
×
10
−
3
eV
2
c
−
4
. The Bayesian analyses show a weak preference for normal mass ordering (89% posterior probability) and the upper
sin
2
θ
23
octant (80% posterior probability), with a uniform prior probability assumed in both cases. The T2K data exclude CP conservation in neutrino oscillations at the
2
σ
level.
Date Issued
2021-06-16
Date Acceptance
2021-05-07
Citation
Physical Review D, 2021, 103 (11), pp.1-59
ISSN
2470-0010
Publisher
American Physical Society (APS)
Start Page
1
End Page
59
Journal / Book Title
Physical Review D
Volume
103
Issue
11
Copyright Statement
© 2021 The Author(s). Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
License URL
Sponsor
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Identifier
https://journals.aps.org/prd/abstract/10.1103/PhysRevD.103.112008
Grant Number
ST/K001604/1
ST/S001174/4
Subjects
hep-ex
hep-ex
Publication Status
Published
Article Number
112008
Date Publish Online
2021-06-16