Impact of Active-Sterile Neutrino Mixing on Physics Potential of Long Baseline Neutrino Oscillation Experiments

摘要

89.1 Introduction The discovery of neutrino oscillation in Super-Kamiokande [1], SNO [2], and Kam-LAND [3] experiments can be considered as a first evidence in favour of new physics beyond the Standard Model (SM) of particle physics. Moreover, the three flavor neutrino oscillation framework is very successful in explaining the observed oscillation data, which involves six parameters (three mixing angles: θ_(12), θ_(13), θ_(23), one phase: δ_(CP), and two mass squared differences: Δm~2_(21), Δm231) and considered as a standard picture of flavour transitions of neutrinos. At this point of time, the investigation of neutrino oscillation enters to an era of precision measurement with the measurement of the reactor mixing angle sin~2 2θ_(13) by both reactor (Daya Bay [4], RENO [5], and Double Chooze [6]) and accelerator (T2K [7]) experiments, which opens up a way to determine the current unknowns in 3-flavor framework such as neutrino Mass Hierarchy (MH), CP-violating phase, and the octant of atmospheric mixing angle. The current and future neutrino oscillation experiments are intend to determine these unknowns.