2 research outputs found
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Measurement of the neutrino mixing angle ?23 in NOvA
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 ?23 mixing (?23=p/4). Assuming the normal mass hierarchy, we find ?m232=(2.67±0.11)×10-3??eV2 and sin2?23 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 2.6s significance
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Constraints on oscillation parameters from ?e appearance and ?µ disappearance in NOvA
Results are reported from an improved measurement of ?µ??e transitions by the NOvA experiment. Using an exposure equivalent to 6.05×1020 protons on target, 33 ?e candidates are observed with a background of 8.2±0.8 (syst.). Combined with the latest NOvA ?µ disappearance data and external constraints from reactor experiments on sin22?13, the hypothesis of inverted mass hierarchy with ?23 in the lower octant is disfavored at greater than 93% C.L. for all values of dCP