Effect of leptonic CP phase in νμ → νμ oscillations

In the case of large 1-3 mixing angle as sin(2)2 theta(13) = 0.03, we investigate the possibility for measuring the leptonic CP phase by using only nu(mu) -> nu(lambda) oscillations independently of nu(mu)->nu(e) oscillations. As the result, we find that the best setup to measure the CP phase without strongly depending on the uncertainties of the other parameters is around the energy E = 0.43GeV and the baseline length L = 5000km. In this region, the CP phase effect remains even after averaging over the neutrino energy. We also find that there is a CP sensitivity even in the short baseline length L <= 1000km if Delta m(31)(2) is determined with an uncertainty of about 0.1%. In the T2KK experiment, we explore the possibility for measuring the CP phase by using a baseline from Tokai to Kamioka after determining Delta m(31)(2) at the baseline to Korea. As the result, we find that some information of the CP phase can be obtained from the measurements.