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Improved measurement of neutrino oscillation parameters by the NOvA experiment

M. A. Acero et al. (The NOvA Collaboration)
Phys. Rev. D 106, 032004 – Published 3 August 2022
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Abstract

We present new νμνe, νμνμ, ν¯μν¯e, and ν¯μν¯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 νe, νμ, 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 θ23 mixing angle, with Δm322=(2.41±0.07)×103eV2 and sin2θ23=0.570.04+0.03. The data disfavor combinations of oscillation parameters that give rise to a large asymmetry in the rates of νe and ν¯e appearance. This includes values of the charge parity symmetry (CP) violating phase in the vicinity of δCP=π/2 which are excluded by >3σ for the inverted mass ordering, and values around δCP=3π/2 in the normal ordering which are disfavored at 2σ confidence.

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  • Received 19 August 2021
  • Accepted 27 April 2022

DOI:https://doi.org/10.1103/PhysRevD.106.032004

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.

Published by the American Physical Society

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Particles & Fields

Viewpoint

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Long-Baseline Neutrino Experiments March On

Published 3 August 2022

Long-baseline neutrino experiments are paving the way for the solution of two outstanding puzzles in neutrino physics—mass ordering and charge-parity violation.

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Vol. 106, Iss. 3 — 1 August 2022

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