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    Improved measurement of neutrino oscillation parameters by the NOvA experiment

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    Date
    2022-08-03
    Author
    Acero, Mario A.
    Adamson, P.
    Aliaga L.
    Meyer, Holger
    Muether, Mathew
    Roy, P.
    Solomey, Nickolas
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    Citation
    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.
    URI
    https://doi.org/10.1103/PhysRevD.106.032004
    https://soar.wichita.edu/handle/10057/23911
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