Muon Energy Estimations at $NO\nu A$

Muon energy reconstruction plays a key role in the muon neutrino disappearance analysis in the $NO\nu A$ experiment. We now employ three different methods to estimate the energy of muons in the $NO\nu A$ detectors: range, calorimetry and multiple scattering. Each of them takes advantage of the properties of the $NO\nu A$ detectors and yields a different resolution for muon energy. Given the distinct approaches of these methods, events for which each of them has better resolution, respectively, have different characteristics. As a consequence, each can be applied to those events for which its resolution is higher. The three techniques are presented and compared.