Four species neutrino oscillations at ν-Factory: sensitivity and CP-violation

The prospects of measuring the leptonic angles and CP-odd phases at a neutrino factory are discussed in the scenario of three active plus one sterile neutrino. We consider the νμ → νe LSND signal. Its associated large mass difference leads to observable neutrino oscillations at short (∼ 1 km) baseline experiments. Sensitivities to the leptonic angles down to 10 can be easily achieved with a 1 Ton detector. Longer baseline experiments (∼ 100 km) with a 1 Kton detector can provide very clean tests of CP-violation especially through tau lepton detection.