AI Article Synopsis
- The NOvA experiment improved measurements of muon neutrino (ν_{μ}) to electron neutrino (ν_{e}) transitions, detecting 33 ν_{e} candidates amid a background of 8.2±0.8.
- Combining this data with recent ν_{μ} disappearance results and reactor experiment constraints,
- the study disfavored the inverted mass hierarchy scenario for neutrino mixing at over 93% confidence level across all values of the CP-violating phase (δ_{CP}).
Article Abstract
Results are reported from an improved measurement of ν_{μ}→ν_{e} transitions by the NOvA experiment. Using an exposure equivalent to 6.05×10^{20} protons on target, 33 ν_{e} candidates are observed with a background of 8.2±0.8 (syst.). Combined with the latest NOvA ν_{μ} disappearance data and external constraints from reactor experiments on sin^{2}2θ_{13}, the hypothesis of inverted mass hierarchy with θ_{23} in the lower octant is disfavored at greater than 93% C.L. for all values of δ_{CP}.
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| http://dx.doi.org/10.1103/PhysRevLett.118.231801 | DOI Listing |
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