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The NOvA experiment has made a $4.4\sigma$-significant observation of$\bar\nu_{e}$ appearance in a 2 GeV $\bar\nu_{\mu}$ beam at a distance of 810km. Using $12.33\times10^{20}$ protons on target delivered to the Fermilab NuMIneutrino beamline, the experiment recorded 27 $\bar\nu_{\mu} \rightarrow\bar\nu_{e}$ candidates with a background of 10.3 and 102 $\bar\nu_{\mu}\rightarrow \bar\nu_{\mu}$ candidates. This new antineutrino data is combinedwith neutrino data to measure the oscillation parameters $|\Delta m^2_{32}| =2.48^{+0.11}_{-0.06}\times10^{-3}$ eV$^2/c^4$, $\sin^2 \theta_{23} =0.56^{+0.04}_{-0.03}$ in the normal neutrino mass hierarchy and upper octantand excludes most values near $\delta_{\rm CP}=\pi/2$ for the inverted masshierarchy by more than 3$\sigma$. The data favor the normal neutrino masshierarchy by 1.9$\sigma$ and $\theta_{23}$ values in the upper octant by1.6$\sigma$.

First measurement of neutrino oscillation parameters using neutrinos and antineutrinos by NOvA