Abstract
The NOvA experiment uses the Fermilab NuMI neutrino beam and a newly constructed 14 kt detector to address several open questions in neutrino oscillations including the neutrino mass hierarchy, the precise value of the angle θ23, and the CP-violating phase δCP. The experiment has been running since 2014 and has recently released its first results from an equivalent exposure of 2.74×1020 protons-on-target equal to 8% of the eventual data set. Measurements of νμ→νμ oscillations find Δm322=(2.52−0.18+0.20)×10−3 eV2 and 0.38<sin2θ23<0.65 for the normal neutrino mass hierarchy. The experiment has observed νμ→νe oscillations at 3.3 σ C.L. in this early data and disfavors the inverted neutrino mass hierarchy in the range 0.1π<δCP<0.5π at the 90% C.L.
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