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Recent T2K neutrino oscillation results

Research output: Contribution to Journal/MagazineConference articlepeer-review

  • T2K Collaboration
Article number394
<mark>Journal publication date</mark>2019
<mark>Journal</mark>Proceedings of Science
Publication StatusPublished
<mark>Original language</mark>English
Event2019 European Physical Society Conference on High Energy Physics, EPS-HEP 2019 - Ghent, Belgium
Duration: 10/07/201917/07/2019


Conference2019 European Physical Society Conference on High Energy Physics, EPS-HEP 2019


T2K is a long-baseline neutrino oscillation experiment sited in Japan that explores neutrino oscillations via νµ disappearance measurements and νµ → νe 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 δCP. The best-fit results for the mixing angles sin2 θ23 for normal mass ordering and for inverted mass ordering, respectively, are 0.532+0.030−0.037 and 0.532−0.035+0.029, with corresponding mass differences in each case of ∆m232= (2.452+0.071−0.070) ×103 eV2 and ∆m213= (2.432−0.071+0.069) ×103 eV2. The parameter sin2 θ13 was measured to be 0.0268+0.0055−0.0043 (normal ordering) and 0.0300−0.0050+0.0059 (inverted ordering). The 1σ allowed region for δCPis [−2.509,−1.260] for normal ordering. No region of inverted ordering is included in the 1σ confidence level. In both cases, the CP-conserving values of δCP= 0, π have been excluded at the 2σ level. T2K has seen a small preference for normal ordering over inverted ordering with a Bayes factor of 8.0.

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