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The NOvA experiment has seen a 4.4σ signal of e appearance in a 2 GeVμ beam at a distance of 810 km. Using 12.33×1020 protons on target delivered to the Fermilab NuMI neutrino beamline, the experiment recorded 27 μe candidates with a background of 10.3 and 102μμ candidates. This new antineutrino data are combined with neutrino data to measure the parameters |Δm 2 32 | = 2.48 +0.11 -0.06 x 10 -3 eV2 / c4 and sin2 θ23 in the ranges from (0.53- 0.60) and (0.45-0.48) in the normal neutrino mass hierarchy. The data exclude most values near δ CP = π / 2 for the inverted mass hierarchy by more than 3 σ and favor the normal neutrino mass hierarchy by 1.9σ and θ23 values in the upper octant by 1.6σ .

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APA Citation

Acero, M. A., Adamson, P., Aliaga, L., T. Alion, V. Allakhverdian, S. Altakarli, N. Anfimov, A. Antoshkin, A. Aurisano, Back, A., C. Backhouse, Baird, M., N. Balashov, Baldi, P., B. Bambah, Bashar, S., Bays, K., Bending, S., Bernstein, R. H., & Bhatnagar, V. (2019). First measurement of neutrino oscillation parameters using neutrinos and antineutrinos by NOvA. Physical Review Letters, 123(15).