Measurement of the Neutrino Mixing Angle θ23 in NOvA

NOvA Collaboration

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109 Scopus citations


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.

Original languageEnglish (US)
Article number151802
JournalPhysical Review Letters
Issue number15
StatePublished - Apr 10 2017

ASJC Scopus subject areas

  • General Physics and Astronomy


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