We present new $\nu_\mu\rightarrow\nu_e$, $\nu_\mu\rightarrow\nu_\mu$, $\overline{ \nu}_\mu\rightarrow\overline{ \nu}_e$, and $\overline{ \nu}_\mu\rightarrow\overline{ \nu}_\mu$ 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 $\Delta m^{ 2}_{ 32} = (2.41\pm0.07)\times 10^{ -3}$ eV$^2$ and $\sin^2\theta_{ 23} = 0.57^{ +0.03}_{ -0.04}$. 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.
Categories: hep-ex