On the determination of the leptonic CP phase
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The combination of data from long-baseline and reactor oscillation experiments leads to a preference of the leptonic CP phase δ CP in the range between π and 2π. We study the statistical significance of this hint by performing a Monte Carlo simulation of the relevant data. We find that the distribution of the standard test statistic used to derive confidence intervals for δ CP is highly non-Gaussian and depends on the unknown true values of θ 23 and the neutrino mass ordering. Values of δ CP around π/2 are disfavored at between 2σ and 3σ, depending on the unknown true values of θ 23 and the mass ordering. Typically the standard χ 2 approximation leads to over-coverage of the confidence intervals for δ CP. For the 2-dimensional confidence region in the (δ CP, θ 23) plane the usual χ 2 approximation is better justified. The 2-dimensional region does not include the value δ CP = π/2 up to the 86.3% (89.2%) CL assuming a true normal (inverted) mass ordering. Furthermore, we study the sensitivity to δ CP and θ 23 of an increased exposure of the T2K experiment, roughly a factor 12 larger than the current exposure and including also anti-neutrino data. Also in this case deviations from Gaussianity may be significant, especially if the mass ordering is unknown.
KeywordsNeutrino Physics CP violation
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