【Press Release】“Rival” neutrino experiments NOvA and T2K publish first joint analysis | ICRR | Institute for Cosmic Ray Research University of Tokyo

The T2K experiment in Japan and the NOvA experiment in the United States conducted a joint analysis and published their first results in the journal Nature. Although the ordering of the three neutrino masses is still unknown, their results show that depending on this ordering, the magnitude of CP symmetry violation—a difference in behavior between particles and antiparticles—would be strongly constrained.

T2K in Japan (left) and NOvA in the United States (right) are both long-baseline experiments: they each shoot an intense beam of neutrinos that passes through both a near detector close to the neutrino source and a far detector hundreds of kilometers away. Both experiments compare data recorded in each detector to learn about neutrinos’ behavior and properties.

Original publication
S.Abubakar et al. (NOvA and T2K collaboration) (2025): Joint neutrino oscillation analysis of data from the T2K and NOvA experiments, Nature 646, 818–824, October 23, 2025
DOI: https://doi.org/10.1038/s41586-025-09599-3

　See the next PDF for further details.