Summary of golden measurements at a ν-factory

Abstract The precision and discovery potential of a neutrino factory based on muon storage rings is summarized. For three-family neutrino oscillations, we analyze how to measure or severely constrain the angle θ 13 , CP violation, MSW effects and the sign of the atmospheric mass difference Δ m 23 2 . The appearance of “wrong-sign muons” at three reference baselines is considered: 732, 3500 and 7332 km. We exploit the dependence of the signal on the neutrino energy, and include realistic background estimations and detection efficiencies as well. The optimal baseline turns out to be O (3000 km).