Terrestrial neutrino experiments and the search for leptonic CP violation

Terrestrial neutrino experiments could be the ideal tool to investigate CP violation in the leptonic sector if the θ13angle of the PMNS matrix is sufficiently high. This condition will be tested by several future long-baseline detectors (Phase I experiments). We discuss the interplay among these experiments and possible synergies. It is shown that, without a dedicated ¯ν run, Phase I experiments cannot reach a sensitivity able to ground (or discourage in a definitive manner) the building of the Phase II projects that are aimed at the determination of the leptonic CP phase. In fact, this capability is almost saturated by high energy beams like CNGS, especially for high values of the ratio Δm221/|Δm231|. Moreover, we discuss the interplay between on-peak and off-peak experiments and the constraints to the PMNS matrix in case of early evidence for νμ→ νeoscillations at the athmospheric scale (high θ13). PACS: 14.60.Pq Neutrino mass and mixing.