Ghostly neutrinos have been caught shape-shifting in a way no one has directly observed before, a particle experiment in Japan has confirmed. The result may open the door to new, exotic physics. Notoriously aloof, neutrinos are nearly massless and scarcely interact with other particles. They come in three flavours - muon, electron and tau - and are believed to be able to flip-flop between these types in a process called oscillation. Most experiments measure the rate of oscillation by starting with one neutrino type and seeing how many of those have disappeared by the time the particles reach a detector.
展开▼
