학술논문
Measurement of the Neutrino Mixing Angle θ23 in NOvA
Document Type
article
Author
Adamson, P; Aliaga, L; Ambrose, D; Anfimov, N; Antoshkin, A; Arrieta-Diaz, E; Augsten, K; Aurisano, A; Backhouse, C; Baird, M; Bambah, BA; Bays, K; Behera, B; Bending, S; Bernstein, R; Bhatnagar, V; Bhuyan, B; Bian, J; Blackburn, T; Bolshakova, A; Bromberg, C; Brown, J; Brunetti, G; Buchanan, N; Butkevich, A; Bychkov, V; Campbell, M; Catano-Mur, E; Childress, S; Choudhary, BC; Chowdhury, B; Coan, TE; Coelho, JAB; Colo, M; Cooper, J; Corwin, L; Cremonesi, L; Cronin-Hennessy, D; Davies, GS; Davies, JP; Derwent, PF; Desai, S; Dharmapalan, R; Ding, P; Djurcic, Z; Dukes, EC; Duyang, H; Edayath, S; Ehrlich, R; Feldman, GJ; Frank, MJ; Gabrielyan, M; Gallagher, HR; Germani, S; Ghosh, T; Giri, A; Gomes, RA; Goodman, MC; Grichine, V; Group, R; Grover, D; Guo, B; Habig, A; Hartnell, J; Hatcher, R; Hatzikoutelis, A; Heller, K; Himmel, A; Holin, A; Hylen, J; Jediny, F; Judah, M; Kafka, GK; Kalra, D; Kasahara, SMS; Kasetti, S; Keloth, R; Kolupaeva, L; Kotelnikov, S; Kourbanis, I; Kreymer, A; Kumar, A; Kurbanov, S; Lang, K; Lee, WM; Lin, S; Liu, J; Lokajicek, M; Lozier, J; Luchuk, S; Maan, K; Magill, S; Mann, WA; Marshak, ML; Matera, K; Matveev, V; Méndez, DP; Messier, MD; Meyer, H; Miao, T
Source
Physical Review Letters. 118(15)
Subject
Language
Abstract
This Letter reports new results on muon neutrino disappearance from NOvA, using a 14 kton detector equivalent exposure of 6.05×10^{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 θ_{23} mixing (θ_{23}=π/4). Assuming the normal mass hierarchy, we find Δm_{32}^{2}=(2.67±0.11)×10^{-3} eV^{2} and sin^{2}θ_{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 2.6σ significance.