Prospects and synergies between future atmospheric and long-baseline experiments

In this talk we will discuss the physics reach of the atmospheric neutrino data collected by a future megaton-class neutrino detector. First we will discuss the potentialities of atmospheric neutrinos on general basis, presenting our results in the form of neutrino oscillograms of the Earth: contour plots in the neutrino energy–nadir angle plane. In this context we will analyze in detail the various signatures related to θ13, to the neutrino mass hierarchy, to the octant of θ23 and to the δCP phase which appear for different values of the neutrino energy and baseline. Then we will consider concrete experimental setups, showing that synergic effects exist between atmospheric and longbaseline neutrino data: the combination of the two data sets is much more powerful than the simple sum of the sensitivity of each individual data sample.