# Constraints on Oscillation Parameters from $\nu_e$ Appearance and $\nu_\mu$ Disappearance in NOvA

## TL;DR

This paper reports an improved measurement of neutrino oscillation parameters using NOvA data, constraining the neutrino mass hierarchy and mixing angles with high confidence.

## Contribution

The study provides new constraints on the neutrino mass hierarchy and mixing angles by combining $
u_e$ appearance and $
u_$ disappearance data with external reactor experiment results.

## Key findings

- Increased $
u_e$ candidate detection with background estimation.
- Disfavoring of inverted hierarchy with lower octant $ heta_{23}$ at >93% C.L.
- Enhanced constraints on $ heta_{13}$ and $ heta_{23}$ parameters.

## Abstract

Results are reported from an improved measurement of $\nu_\mu \rightarrow \nu_e$ transitions by the NOvA experiment. Using an exposure equivalent to $6.05\times10^{20}$ protons-on-target 33 $\nu_e$ candidates were observed with a background of $8.2\pm0.8$ (syst.). Combined with the latest NOvA $\nu_\mu$ disappearance data and external constraints from reactor experiments on $\sin^22\theta_{13}$, 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 $\delta_{CP}$.