Measurement of the Neutrino Mixing Angle θ23 in NOvA

Adamson, P and Aliaga, L and Ambrose, D and Anfimov, N and Antoshkin, A and Arrieta-Diaz, E and Augsten, K and Aurisano, A and Backhouse, C and Baird, M and Bambah, B A and Bays, K and Behera, B and Bending, S and Bernstein, R and Bhatnagar, V and Bhuyan, B and Bian, J and Blackburn, T and Bolshakova, A and Bromberg, C and Brown, J and Brunetti, G and Buchanan, N and Butkevich, A and Bychkov, V and Campbell, M and Catano-Mur, E and Childress, S and Choudhary, B C and Chowdhury, B and Coan, T E and Coelho, J A B and Colo, M and Cooper, J and Corwin, L and Cremonesi, L and Cronin-Hennessy, D and Davies, G S and Davies, J P and Derwent, P F and Desai, Shantanu and et al, . (2017) Measurement of the Neutrino Mixing Angle θ23 in NOvA. Physical Review Letters, 118 (15). ISSN 0031-9007

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Abstract

This Letter reports new results on muon neutrino disappearance from NOvA, using a 14 kton detector equivalent exposure of 6.05 x 10(20) protons on target from the NuMI beam at the Fermi National Accelerator Laboratory. The measurement probes the muon-tau symmetry hypothesis that requires maximal theta(23) mixing (theta(23) = pi/4). Assuming the normal mass hierarchy, we find Delta m(32)(2) = (2.67 +/- 0.11) x 10(-3) eV(2) and sin(2) theta(23)at the two statistically degenerate values 0.404(-0.022)(+0.030) and 0.624(-0.030)(+0.022), both at the 68% confidence level. Our data disfavor the maximal mixing scenario with 2.6 sigma significance.

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