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We present new νμ → νe, νμ → νμ, μe, and μμ 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, e, and 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 θ23mixing angle, with Δm232 = (2.41± 0.07) x 10 -3 eV2 and sin2 θ23 = 0.57 +0.03-0.04. The data disfavor combinations of oscillation parameters that give rise to a large asymmetry in the rates of νe and 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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APA Citation

Acero, M. A., Adamson, P., Aliaga, L., Anfimov, N., Antoshkin, A., Arrieta-Diaz, E., Asquith, L., Aurisano, A., Back, A., Backhouse, C., Baird, M., Balashov, N., Baldi, P., Bambah, B. A., Bashar, S., Bays, K., Bernstein, R., Bhatnagar, V., Bhattarai, D., … Zwaska, R. (2022). Improved measurement of neutrino oscillation parameters by the Nova experiment. Physical Review D, 106(3).