CP nonconservation in three-neutrino oscillations

Direct CP tests in neutrino oscillations require comparison of off-diagonal channels ν/sub α/→ν/sub β/ with the CP-conjugate channels nu-bar/sub α/→nu-bar/sub β/ (or with ν/sub β/→ν/sub α/ assuming CPT invariance). For the three-neutrino case, we show that CP-nonconservation effects are identical in all three available channels ν/sub e/bold-arrow-left-rightν/sub μ/, ν/sub μ/bold-arrow-left-rightν/sub tau/, μ/sub tau/bold-arrow-left-rightν/sub e/, and argue that they could be large and measurable in meson factor experiments. Indirect CP tests include the correlation of average probabilities