New constraints on oscillation parameters from νe appearance and νμ disappearance in the NOvA experiment

We present updated results from the NOvA experiment for ν_μ→ν_μ and ν_μ→ν_e oscillations from an exposure of 8.85 ×10²⁰ 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 ν_μ disappearance and ν_e appearance gives the best-fit point as normal mass hierarchy, Δ m₃₂²=2.44 ×10^-3 eV²/c⁴ , sin²θ₂₃=0.56 , and δ_CP=1.21 π . The 68.3% confidence intervals in the normal mass hierarchy are Δ m₃₂² ∈[2.37 ,2.52 ]×10^-3 eV²/c⁴ , sin²θ₂₃ ∈[0.43 ,0.51 ]∪[0.52 ,0.60 ], and δ_CP∈[0 ,0.12 π ]∪[0.91 π ,2 π ]. The inverted mass hierarchy is disfavored at the 95% confidence level for all choices of the other oscillation parameters.