Intense Neutrino Beams and Leptonic CP Violation

Effects of the Leptonic CP violating phase, δ, on 3 generation neutrino oscillation rates and asymmetries are discussed. A figure of merit argument is used to show that our ability to measure the phase δ is rather insensitive to the value of θ13 (for ) as well as the detector distance (for very long oscillation baselines). Using a study of νμ→νϵ oscillations for BNL-Homestake (2540 km) we show that a conventional horn focused wide band neutrino beam generated by an intense 1–2 MW proton source combined with a very large water Cherenkov detector (250–500 kton) should be able to determine δ to about ±15° in 5×107 sec. of running. In addition, such an effort would also measure the other oscillation parameters with high precision. Similar findings apply to a Fermilab-Homestake (1280 km) baseline. We also briefly discuss features of Superbeams, Neutrino Factories and Beta-Beams.