The T2K (Tokai-to-Kamioka) experiment is a long-baseline oscillation experiment situated in Japan.  A high intensity muon neutrino beam is sent from the JPARC proton accelerator complex in Tokai to the SuperKamiokande detector, 295 km away.
The T2K collaboration has recently firmly established the observation of the appearance of electron neutrinos from a muon neutrino beam with a significance of 7.3σ. Furthermore T2K has become the world leading experiment concerning the measurement of the mixing angle