Correlations of errors in a CP-violation neutrino factory experiment

An indirect CP-violation neutrino factory experiment is studied, including simultaneous correlations of errors of the six oscillation parameters and a matter effect normalisation parameter, C. It is found that for larger values of θ13 (3°), an uncertainty on the matter effect of the order 5% means that the optimal baseline for measurement of δ is reduced from 3000 to 2000 km. When the background fraction is assumed to be 10−3 the optimal muon energy is also reduced from 50 GeV to around 20 GeV. An experiment with L=2000 km, Eμ=20 GeV is found to be sensitive to non-zero δ down to around θ13≈0.3°.