Volume 364 - European Physical Society Conference on High Energy Physics (EPS-HEP2019) - Neutrino Physics
Recent T2K Neutrino Oscillation Results
L. Kormos
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Abstract
T2K is a long-baseline neutrino oscillation experiment sited in Japan that explores neutrino oscillations via $\nu_{\mu}$ disappearance measurements and $\nu_{\mu}\to\nu_{e}\,\,$ appearance measurements. Neutrino mixing angles and mass differences have been measured under the assumption of both of the possible mass orderings, and constraints have been set on the CP-violating phase $\delta_{CP}\,$ . The best-fit results for the mixing angles $\sin^2 \theta_{23}$ for normal mass ordering and for inverted mass ordering, respectively, are $0.532^{+0.030}_{−0.037}$ and $0.532^{+0.029}_{−0.035}$, with corresponding mass differences in each case of $\Delta {\mbox m}_{32}^2$ = $(2.452^{+0.071}_{−0.070} ) \times 10^{−3}$ eV$^2$ and $\Delta {\mbox m}_{13}^2$ = $(2.432^{+0.069}_{−0.071}) \times 10^{−3}$ eV$^2$ . The parameter $\sin^2 \theta_{13}$ was measured to be $0.0268^{+0.0055}_{−0.0043}$ (normal ordering) and $0.0300^{+0.0059}_{−0.0050}$ (inverted ordering). The 1σ allowed region for $\delta_{CP}\,$ is [−2.509, −1.260] for normal ordering. No region of inverted ordering is included in the $1\sigma$ confidence level. In both cases, the CP-conserving values of $\delta_{CP} = 0, \pi$ have been excluded at the $2\sigma$ level. T2K has seen a small preference for normal ordering over inverted ordering with a Bayes factor of 8.0.
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