Determining the neutrino mass hierarchy andCP-violation inNOνAwith a second off-axis detector

We consider a Super-$\mathrm{NO}\nu \mathrm{A}$-like experimental configuration based on the use of two detectors in a long-baseline experiment as $\mathrm{NO}\nu \mathrm{A}$. We take the far detector as in the present $\mathrm{NO}\nu \mathrm{A}$ 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 ${\theta }_{13}$. 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 $\mathrm{NO}\nu \mathrm{A}$ experiment could be achieved.