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

The prospects of measuring the leptonic angles and CP-odd phases at a neutr ino factory are discussed in the scenario of three active plus one sterile neutrino. We consider the nu(mu) --> nu(e) LSND signal. Its associated larg e mass difference leads to observable neutrino oscillations at short (simil ar to 1 km) baseline experiments. Sensitivities to the leptonic angles down to 10(-3) can be easily achieved with a 1 t detector. Longer baseline expe riments (similar to 100 km) with a 1 kt detector can provide very clean tes ts of CP-violation especially through tau lepton detection. (C) 2000 Elsevi er Science B.V. All rights reserved.