Determining the neutrino mass hierarchy and CP-violation in NOνA with a second off-axis detector

We consider a Super-NOνA-like experimental configuration based on the use of two detectors in a long-baseline experiment as NOνA. We take the far detector as in the present NOνA proposal and add a second detector at a shorter baseline. The location of the second off-axis detector is chosen such that the ratio L/E is the same for both detectors, being L the baseline and E the neutrino energy. We consider liquid argon and water-Čerenkov techniques for the second off-axis detector and study, for different experimental setups, the detector mass required for the determination of the neutrino mass hierarchy, for different values of θ₁₃. We also study the capabilities of such an experimental setup for determining CP-violation in the neutrino sector. Our results show that by adding a second off-axis detector a remarkable enhancement on the capabilities of the current NOνA experiment could be achieved.