Improved measurement of neutrino oscillation parameters by the NOvA experiment
Date
2022-08-03Author
Acero, Mario A.
Adamson, P.
Aliaga L.
Meyer, Holger
Muether, Mathew
Roy, P.
Solomey, Nickolas
Metadata
Show full item recordCitation
The, N. C., Acero, M. A., Adamson, P., Aliaga, L., Anfimov, N., Antoshkin, A., . . . Zwaska, R. (2022). Improved measurement of neutrino oscillation parameters by the NOvA experiment. Physical Review D, 106(3), 032004. https://doi.org/10.1103/PhysRevD.106.032004
Abstract
We present new
ν
μ
→
ν
e
,
ν
μ
→
ν
μ
,
¯
ν
μ
→
¯
ν
e
, and
¯
ν
μ
→
¯
ν
μ
oscillation measurements by the NOvA experiment, with a 50% increase in neutrino-mode beam exposure over the previously reported results. The additional data, combined with previously published neutrino and antineutrino data, are all analyzed using improved techniques and simulations. A joint fit to the
ν
e
,
ν
μ
,
¯
ν
e
, and
¯
ν
μ
candidate samples within the 3-flavor neutrino oscillation framework continues to yield a best-fit point in the normal mass ordering and the upper octant of the
θ
23
mixing angle, with
Δ
m
2
32
=
(
2.41
±
0.07
)
×
10
−
3
eV
2
and
sin
2
θ
23
=
0.5
7
+
0.03
−
0.04
. The data disfavor combinations of oscillation parameters that give rise to a large asymmetry in the rates of
ν
e
and
¯
ν
e
appearance. This includes values of the charge parity symmetry (CP) violating phase in the vicinity of
δ
CP
=
π
/
2
which are excluded by
>
3
σ
for the inverted mass ordering, and values around
δ
CP
=
3
π
/
2
in the normal ordering which are disfavored at
2
σ
confidence.
Description
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.