The first T2K beam neutrino event since the earthquake of March 2011 was seen in Super-Kamiokande (T2K’s far detector) on 26th Janaury 2012. It is shown in the event display above, and has a Cherenkov ring produced by a muon in the centre of the image. This muon was produced when a muon neutrino in the T2K beam interacted with a neutron or proton in an oxygen nucleus in the water of Super-Kamiokande. The detection of this event is another major step towards resumption of data taking by T2K, which is due to start in March 2012.
We would like to thank Kamioka Observatory, Institute for Cosmic Ray Research, University of Tokyo for supplying the event display.