Masses and mixings from neutrino beams pointing to neutrino telescopes

We discuss the potential to determine leading oscillation parameters, the v alue and the sign of Deltam(31)(2), as well as the magnitude of si(n)2 2 th eta (13) using a conventional wide band neutrino beam pointing to water or ice Cherenkov neutrino detectors known as "neutrino telescopes". We find th at precision measurements of Deltam(31)(2) and theta (23) 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 theta (13) and the sign of Deltam(31)(2) (C) 2000 Elsevier Science B.V. All righ ts reserved.