Abstract:

T2K (Tokai-to-Kamioka) is a long-baseline off-axis accelerator neutrino oscillation experiment designed to search for the appearance of electron neutrinos in a muon neutrino beam and to make precision measurements of muon neutrino disappearance. The beam is produced at the J-PARC facility in Tokai, Japan, where it is measured at a baseline of 280m by the ND280 near detectors before traveling 295 km to the far detector, Super-Kamiokande. I will present a first look at muon neutrino disappearance and electron neutrino appearance based on the inaugural T2K Run I, which ended in June 2010.