DOIAbstract
The neutrino facility in the Japan Proton Accelerator Research Complex (J-PARC) produces a very intense neutrino beam for the Tokai to Kamioka long-baseline neutrino oscillation exper-iment, T2K. The physics operation of the T2K started in January 2010 and the data taken from the January 2010 to March 2011 period correspond to 1.43 × 1020 protons on target. From analysis of these data, the first nm ne appearance candidates were observed and an indication of sin22u13 = 0 was obtained with 2.5s significance. The T2K aims for a very precise measure-ment of ne appearance and a possible search for CP violation with very large statistics. 1
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