An Improved Measurement of Neutrino Oscillation Parameters by the NOvA Experiment

Abstract

We present new ${\nu }_{\mu }\to {\nu }_e$, ${\nu }_{\mu }\to {\nu }_{\mu }$, ${\overline{\nu }}_{\mu }\to {\overline{\nu }}_e$, and ${\overline{\nu }}_{\mu }\to {\overline{\nu }}_{\mu }$ oscillation measurements by the NOvA experiment, with a 50% increase in neutrino-mode beam exposure over the previously reported results. The additional data, combined with previously published neutrino and antineutrino data, are all analyzed using improved techniques and simulations. A joint fit to the ${\nu }_e$, ${\nu }_{\mu }$, ${\overline{\nu }}_e$, and ${\overline{\nu }}_{\mu }$ candidate samples within the 3-flavor neutrino oscillation framework continues to yield a best-fit point in the normal mass ordering and the upper octant of the ${\theta }_{23}$ mixing angle, with $\Delta m_{32}^2=(2.41\pm 0.07)\times 10^{-3}$ eV${}^2$ and ${\sin }^2{\theta }_{23}=0.57_{-0.04}^{+0.03}$. The data disfavor combinations of oscillation parameters that give rise to a large asymmetry in the rates of ${\nu }_e$ and ${\overline{\nu }}_e$ appearance. This includes values of the CP-violating phase in the vicinity of ${\delta }_{\text{CP}}=\pi /2$ which are excluded by $>3\sigma$ for the inverted mass ordering, and values around ${\delta }_{\text{CP}}=3\pi /2$ in the normal ordering which are disfavored at 2$\sigma$ confidence.

11 pages, 6 figures. Supplementary material attached (7 figures)

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