Measurement of the Neutrino Mixing Angle θ.sub.23./sub. in NOvA

0484233 - FZÚ 2018 RIV US eng J - Článek v odborném periodiku
Adamson, P. - Aliaga, L. - Ambrose, D. - Lokajíček, Miloš - Zálešák, Jaroslav … celkem 181 autorů
Measurement of the Neutrino Mixing Angle θ₂₃ in NOvA.
Physical Review Letters. Roč. 118, č. 15 (2017), s. 1-7, č. článku 151802. ISSN 0031-9007. E-ISSN 1079-7114
Grant CEP: GA MŠMT LM2015068; GA MŠMT(CZ) LG15047
Institucionální podpora: RVO:68378271
Klíčová slova: muon tau * symmetry * mass * hierarchy * neutrino * mixing * NOvA * experimental results
Obor OECD: Particles and field physics
Impakt faktor: 8.839, rok: 2017

This Letter reports new results on muon neutrino disappearance from NOvA, using a 14 kton detector equivalent exposure of 6.05×1020 protons on target from the NuMI beam at the Fermi National Accelerator Laboratory. The measurement probes the muon-tau symmetry hypothesis that requires maximal θ23 mixing (θ23=π/4). Assuming the normal mass hierarchy, we find Δm322=(2.67±0.11)×10-3  eV2 and sin2θ23 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.
Trvalý link: http://hdl.handle.net/11104/0279370