The Tokai to Kamioka Experiment (T2K) is based in Japan with collaborators in the U.S., Canada, France, Spain, Italy, Poland, Germany and the United Kingdom. The experiment is investigating neutrino oscillation using the near detector (ND280) located at a distance of 280 meters and the far detector Super Kamiokande (SK) in Kamioka, 295 kilometers away.
The T2K experiment had first indications of muon neutrinos oscillating into electron neutrinos in 2011. This resulted in the T2K collaboration receiving the Fundamental Physics Prize in October 2015. More recently the T2K has measured anti-muon neutrino disappearance oscillations and anti-muon neutrino appearance oscillations into anti-electron neutrinos where it observed 4 event candidates. As of Summer 2016, the low statistics evidence combining the neutrino and the antineutrino appearance oscillation results indicate a deviation from Charge-Parity conservation in neutrino interactions where T2K finds an excess of neutrino oscillation events and a deficit of antineutrino oscillation events.