This Letter reports new results on muon neutrino disappearance from NOvA, using a 14 kton detector equivalent exposure of 6.05×1020 protons on target from the NuMI beam at the Fermi National Accelerator Laboratory. The measurement probes the muon-tau symmetry hypothesis that requires maximal θ23 mixing (θ23=π/4). Assuming the normal mass hierarchy, we find Δm322=(2.67±0.11)×10-3 eV2 and sin2θ23 at the two statistically degenerate values 0.404-0.022+0.030 and 0.624-0.030+0.022, both at the 68% confidence level. Our data disfavor the maximal mixing scenario with 2.6σ significance.
CITATION STYLE
Adamson, P., Aliaga, L., Ambrose, D., Anfimov, N., Antoshkin, A., Arrieta-Diaz, E., … Zwaska, R. (2017). Measurement of the Neutrino Mixing Angle θ23 in NOvA. Physical Review Letters, 118(15). https://doi.org/10.1103/PhysRevLett.118.151802
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