Constraints on Oscillation Parameters from ${\nu }_e$ Appearance and ${\nu }_{\mu }$ Disappearance in NOvA

Abstract

Results are reported from an improved measurement of ${\nu }_{\mu }\to {\nu }_e$ transitions by the NOvA experiment. Using an exposure equivalent to $6.05\times 10^{20}$ protons-on-target 33 ${\nu }_e$ candidates were observed with a background of $8.2\pm 0.8$ (syst.). Combined with the latest NOvA ${\nu }_{\mu }$ disappearance data and external constraints from reactor experiments on ${\sin }^{2}2{\theta }_{13}$, the hypothesis of inverted mass hierarchy with ${\theta }_{23}$ in the lower octant is disfavored at greater than $93\%$ C.L. for all values of ${\delta }_{CP}$.

arXiv comment6 pages, 4 figures

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