Physics potential of T2KK: An extension of the T2K neutrino oscillation experiment with a far detector in Korea

Abstract

We study physics potential of placing a far detector in the east coast of Korea, where the off-axis beam from J-PARC at Tokai village for the T2K project has significant intensity at a few GeV range. In particular we examine the capability of determining the mass hierarchy pattern and the CP phase of the lepton-flavor-mixing matrix when a 100 kt water Cerenkov detector is placed at various locations in Korea for the off-axis beam (OAB) of 2.5 deg. and 3 deg. at the Super-Kamiokande site. The best results are found for a combination of 3 deg. OAB at SK (L = 295 km) and 0.5 deg. OAB at L = 1000km, where the mass hierarchy pattern can be determined at 3-σlevel for sin^2 2θ_{RCT} \simgt 0.05 (0.06) when the hierarchy is normal (inverted), after 5 years of running (5 \times 10^{21}POT). We also find that the leptonic CP phase, δ_{MNS}, can be constrained uniquely, without invoking anti-neutrino beams, as long as the mass hierarchy pattern is determined. Those results are obtained by assuming that the charged current quasi-elastic events can be separated from the other backgrounds with high efficiency, the neutrino energy can be reconstructed with a hundred MeV uncertainty, and the earth matter density along the baseline can be determined with 3% accuracy.

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• Non-standard interactions and the CP phase measurements in neutrino oscillations at low energies
• Leptonic CP violation: zero, maximal or between the two extremes
• Sensitivity of the T2HKK experiment to the non-standard interaction
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• Sensitivities and synergies of DUNE and T2HK
• Probing Nonstandard Neutrino Physics by Two Identical Detectors with Different Baselines
• The earth matter effects in neutrino oscillation experiments from Tokai to Kamioka and Korea
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• Physics potential of the ESS$\nu$SB
• Sensitivity of T2KK to the non-standard interaction in propagation
• Solving the degeneracy of the lepton-flavor mixing angle theta_atm by the T2KK two detector neutrino oscillation experiment
• Optimized Two-Baseline Beta-Beam Experiment
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