Ambiguity of theoretical parameters and CP/T violation in neutrino factories

Considering muon storage rings as sources of neutrino beams, we estimate the number of parent muons and the mass of detectors required to observe the CP-violation effect. The ambiguity of theoretical parameters such as differences of squared masses and mixing angles is taken into account. The requirement becomes smallest when the baseline length is about 1000 km and muon energy is about 10 GeV, and the possibility to observe the CP-violation effect still remains.