Measurement of the Neutrino Mixing Angle θ23 in NOvA
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2017
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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 ¼ π=4). Assuming the normal mass hierarchy, we find Δm2
32 ¼ ð2.67 0.11Þ ×
10−3 eV2 and sin2 θ23 at the two statistically degenerate values 0.404þ0.030 −0.022 and 0.624þ0.022 −0.030 , both at the 68%
confidence level. Our data disfavor the maximal mixing scenario with 2.6σ significance.
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ADAMSON, P. et al. Measurement of the Neutrino Mixing Angle θ23 in NOvA. Physical Review Letters, Washington, v. 118, e151802, 2017. DOI: 10.1103/PhysRevLett.118.151802. Disponível em: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.118.151802. Acesso em: 16 maio 2023.