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Measurement of the Neutrino Mixing Angle theta(23) in NOvA
Adamson, P. Jiu, J. Nelson, Jeffrey K. Radovic, A. Vahle, Patrici L.
Adamson, P.
Jiu, J.
Nelson, Jeffrey K.
Radovic, A.
Vahle, Patrici L.
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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2017-04-10
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1701.05891.pdf
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Physics
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https://doi.org/10.1103/PhysRevLett.118.151802