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Observing the leptonic CP-violation is one of aims in future experiments of the neutrino oscillation. It can be achieved by comparing oscillation probabilities with neutrino beam and its antiparticle one; For example, T2K experiment will measure P (νμ → νe) and P (νμ → νe) precisely in its phase II. Such a comparison is important obviously because it gives a direct observation of the leptonic CPviolation (except the matter effect mimics the CP-violation). It seems, however, the matter of the simple method that the exposure with antineutrino beam needs to be about three times longer than that with neutrino beam because of its smaller detection cross-section; In phase II of T2K experiment, about 6year exposure with νμ is planed after 2year exposure with νμ beam. The smaller cross-section even gives worth S/N ratio. Thus, it seems fruitful to consider other possibilities to see CP-violation. In the scheme of three neutrino oscillation, the CP-violation is controlled by the CP-violating phase δ. If we can know δ is not vanishing, it means a measurement of CPviolation indirectly by assuming three neutrino oscillation. The information about δ is included in P (νμ → νe), but the oscillation probability include θ13 also as the parameter to be determined. That is why we require additionally the measurement of P (νμ → νe), whose parameters to be determined are also δ and θ13, to extract the value of δ. Any oscillation probability, however, can be the additional one as long as it has information on the value of θ13. In this talk , we consider a combination of a superbeam experiment with neutrino beam and a reactor experiment, which is a pure measurement of θ13, to explore the CP-violation in lepton sector. Note that the method have an advantage of speed because the reactor experiment can run parallel to the superbeam ν experiment in contrast with the superbeam ν experiment. Although we can extract the value of δ from the combination of reactor and superbeam ν experiments in principle, a quantitative analysis is necessary for concreteness.

EXPLORING LEPTONIC CP VIOLATION WITH COMBINED ANALYSIS OF REACTOR AND NEUTRINO SUPERBEAM EXPERIMENTS