We present updated results from the NOvA experiment for ${\nu }_{\mu }\to {\nu }_{\mu }$ and ${\nu }_{\mu }\to {\nu }_e$ oscillations from an exposure of $8.85\times {10}^{20}$ protons on target, which represents an increase of 46% compared to our previous publication. The results utilize significant improvements in both the simulations and analysis of the data. A joint fit to the data for ${\nu }_{\mu }$ disappearance and ${\nu }_e$ appearance gives the best-fit point as normal mass hierarchy, $\mathrm{\Delta }{m}_{32}^2=2.44\times {10}^{-3}{\mathrm{eV}}^2/c^4$, ${\sin }^2{\theta }_{23}=0.56$, and ${\delta }_{\mathrm{CP}}=1.21\pi$. The 68.3% confidence intervals in the normal mass hierarchy are $\mathrm{\Delta }{m}_{32}^2\in [2.37,2.52]\times {10}^{-3}{\mathrm{eV}}^2/c^4$, ${\sin }^2{\theta }_{23}\in [0.43,0.51]\cup [0.52,0.60]$, and ${\delta }_{\mathrm{CP}}\in [0,0.12\pi ]\cup [0.91\pi ,2\pi ]$. The inverted mass hierarchy is disfavored at the 95% confidence level for all choices of the other oscillation parameters.

• Received 1 June 2018

DOI:https://doi.org/10.1103/PhysRevD.98.032012

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Published by the American Physical Society