Measurement of the neutrino mixing angle θ23 in NOvA

Baird, M, Blackburn, T, Davies, J P, Hartnell, J, Mendez Mendez, D P, Tamsett, M, Vinton, L and Zamorano, B (2017) Measurement of the neutrino mixing angle θ23 in NOvA. Physical Review Letters, 118 (15). a151802 1-7. ISSN 0031-9007

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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 Δm232=(2.67±0.11)×10−3  eV2 and sin2θ23 at the two statistically degenerate values 0.404 +0.030−0.022 and 0.624 +0.022−0.030, both at the 68% confidence level. Our data disfavor the maximal mixing scenario with 2.6σ significance.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Experimental Particle Physics Research Group
Subjects: Q Science > QC Physics
Depositing User: Billy Wichaidit
Date Deposited: 22 Jun 2017 09:14
Last Modified: 16 Nov 2020 16:15

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Project NameSussex Project NumberFunderFunder Ref
Probing Fundamental Physics with Antineutrinos at the NOvA ExperimentG0949EUROPEAN UNION307395