Masses and mixings from neutrino beams pointing to neutrino telescopes

We discuss the potential to determine leading oscillation parameters, the value and the sign of Δm231 , as well as the magnitude of sin22θ13 using a conventional wide band neutrino beam pointing to water or ice Cherenkov neutrino detectors known as “neutrino telescopes”. We find that precision measurements of Δm231 and θ23 are possible and that, even though it is not possible to discriminate between charges in the detector, there is a remarkably good sensitivity to the mixing angle θ13 and the sign of Δm231 .