Measurement of the Neutrino Mixing Angle θ23 in NOvA


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.




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: Acesso em: 16 maio 2023.