Volume 364 -
European Physical Society Conference on High Energy Physics (EPS-HEP2019) -
Neutrino Physics

Recent T2K Neutrino Oscillation Results

Full text:
Not available

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.

How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access

Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.