University of Minnesota
School of Physics & Astronomy
Home > People >


Alec Habig

Measurement of the neutrino mixing angle θ23 in NOvA
P. Adamson et al (The NOvA Collaboration), Physical Review Letters

Download from


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.