New constraints on oscillation parameters from ${\nu }_e$ appearance and ${\nu }_{\mu }$ disappearance in the NOvA experiment

Abstract

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, $\Delta m_{32}^2=2.44\times 10^{-3}{\mathrm{eV}}^2/c^4$, ${\sin }^2{\theta }_{23}=0.56$, and ${\delta }_{CP}=1.21\pi$. The 68.3% confidence intervals in the normal mass hierarchy are $\Delta m_{32}^2\in [2.37,2.52]\times 10^{-3}{\mathrm{eV}}^2/c^4$, ${\sin }^2{\theta }_{23}\in [0.43,0.51]\cup [0.52,0.60]$, and ${\delta }_{CP}\in [0,0.12\pi ]\cup [0.91\pi ,2\pi ]$. The inverted mass hierarchy is disfavored at the 95% confidence level for all choices of the other oscillation parameters.

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