T2K neutrino oscillation experiment

The T2K experiment is a second generation neutrino oscillation experiment using the existing Super-Kamiokande experiment as the main detector. The new Japanese nuclear physics facility being built at Tokai, on Japan's east coast, has a high-power 50 GeV proton synchrotron originally intended to produce beams for neutron scattering and high energy nuclear physics. The aim of T2K is to use this high-intensity proton beam to generate an intense muon neutrino beam aimed approximately at Super-Kamiokande (a slightly off-axis geometry is used to produce a more monochromatic beam).

The primary aim of the T2K experiment is to measure sin²q₂₃ to an accuracy of +0.01, the 2-3 mass squared difference to an accuracy of 10^-4 eV, and the as yet unmeasured mixing angle sin²q₁₃ to an accuracy of approximately 0.01 (depending on the values of other parameters). This performance is about an order of magnitude better than currently running experiments.

A T2K-LAr working group (restricted access) was initiated in November 2004 in order to prepare an Expression of Interest (EOI) for a 100 ton liquid Argon TPC detector at the future 2km position at the T2K experiment in Japan.

A document was sent in May 2005 to the NuSAG committee in USA.

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