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Measurement of the neutrino mixing angle $\theta_{23}$ in NOvA
- Source :
- Phys. Rev. Lett. 118, 151802 (2017)
- Publication Year :
- 2017
-
Abstract
- This Letter reports new results on muon neutrino disappearance from NOvA, using a 14 kton detector equivalent exposure of $6.05\times10^{20}$ protons-on-target from the NuMI beam at the Fermi National Accelerator Laboratory. The measurement probes the muon-tau symmetry hypothesis that requires maximal mixing ($\theta_{23} = \pi/4$). Assuming the normal mass hierarchy, we find $\Delta m^2 = (2.67 \pm 0.11)\times 10^{-3}$ eV$^2$ and $\sin^2 \theta_{23}$ at the two statistically degenerate values $0.404^{+0.030}_{-0.022}$ and $0.624^{+0.022}_{-0.030}$, both at the 68% confidence level. Our data disfavor the maximal mixing scenario with 2.6 $\sigma$ significance.<br />Comment: 7 pages, 3 figures
- Subjects :
- High Energy Physics - Experiment
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. Lett. 118, 151802 (2017)
- Publication Type :
- Report
- Accession number :
- edsarx.1701.05891
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevLett.118.151802