학술논문
First measurement of neutrino oscillation parameters using neutrinos and antineutrinos by NOvA
Document Type
article
Author
Acero, MA; Adamson, P; Aliaga, L; Alion, T; Allakhverdian, V; Altakarli, S; Anfimov, N; Antoshkin, A; Aurisano, A; Back, A; Backhouse, C; Baird, M; Balashov, N; Baldi, P; Bambah, BA; Bashar, S; Bays, K; Bending, S; Bernstein, R; Bhatnagar, V; Bhuyan, B; Bian, J; Blackburn, T; Blair, J; Booth, AC; Bour, P; Bromberg, C; Buchanan, N; Butkevich, A; Calvez, S; Campbell, M; Carroll, TJ; Catano-Mur, E; Cedeno, A; Childress, S; Choudhary, BC; Chowdhury, B; Coan, TE; Colo, M; Cooper, J; Corwin, L; Cremonesi, L; Davies, GS; Derwent, PF; Ding, P; Djurcic, Z; Doyle, D; Dukes, EC; Duyang, H; Edayath, S; Ehrlich, R; Elkins, M; Feldman, GJ; Filip, P; Flanagan, W; Frank, MJ; Gallagher, HR; Gandrajula, R; Gao, F; Germani, S; Giri, A; Gomes, RA; Goodman, MC; Grichine, V; Groh, M; Group, R; Guo, B; Habig, A; Hakl, F; Hartnell, J; Hatcher, R; Hatzikoutelis, A; Heller, K; Hewes, J; Himmel, A; Holin, A; Howard, B; Huang, J; Hylen, J; Jediny, F; Johnson, C; Judah, M; Kakorin, I; Kalra, D; Kaplan, DM; Keloth, R; Klimov, O; Koerner, LW; Kolupaeva, L; Kotelnikov, S; Kourbanis, I; Kreymer, A; Kulenberg, Ch; Kumar, A; Kuruppu, CD; Kus, V; Lackey, T; Lang, K; Lin, S; Lokajicek, M
Source
Physical Review Letters. 123(15)
Subject
Language
Abstract
The NOvA experiment has seen a 4.4σ signal of ν[over ¯]_{e} appearance in a 2 GeV ν[over ¯]_{μ} beam at a distance of 810 km. Using 12.33×10^{20} protons on target delivered to the Fermilab NuMI neutrino beamline, the experiment recorded 27 ν[over ¯]_{μ}→ν[over ¯]_{e} candidates with a background of 10.3 and 102 ν[over ¯]_{μ}→ν[over ¯]_{μ} candidates. This new antineutrino data are combined with neutrino data to measure the parameters |Δm_{32}^{2}|=2.48_{-0.06}^{+0.11}×10^{-3} eV^{2}/c^{4} and sin^{2}θ_{23} 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 3σ and favor the normal neutrino mass hierarchy by 1.9σ and θ_{23} values in the upper octant by 1.6σ.