Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-10-15
Physics
High Energy Physics
High Energy Physics - Phenomenology
Talk at SEESAW 1979-2004, 23-25 February 2004, KEK. 20 pages, 17 figures
Scientific paper
10.1016/j.nuclphysbps.2004.10.05
The three neutrino model has 9 physical parameters, 3 neutrino masses, 3 mixing angles and 3 CP violating phases. Among them, neutrino oscillation experiments can probe 6 parameters: 2 mass squared differences, 3 mixing angles, and 1 CP phase. The experiments performed so far determined the magnitudes of the two mass squared differences, the sign of the smaller mass squared difference, the magnitudes of two of the three mixing angles, and the upper bound on the third mixing angle. The sign of the larger mass squared difference (the neutrino mass hierarchy pattern), the magnitude of the third mixing angle and the CP violating phase, and a two-fold ambiguity in the mixing angle that dictates the atmospheric neutrino oscillation should be determined by future oscillation experiments. In this talk, I introduce a few ideas of future long baseline neutrino oscillation experiments which make use of the super neutrino beams from J-PARC (Japan Proton Accelerator Research Complex) in Tokai village. We examine the potential of HyperKamiokande (HK), the proposed 1 Mega-ton water Cerenkov detector, and then study the fate and possible detection of the off-axis beam from J-PARC in Korea. We also show that very long baseline experiments with higher energy beams from J-PARC and a water Cerenkov calorimeter detector (BAND) proposed in Beijing can resolve the neutrino mass hierarchy, and lift all the degeneracies in the three neutrino model parameters.
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