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The octant of the atmospheric mixing angle $\theta_{23}$ is stillundetermined by neutrino oscillation experiments. Long-baseline experimentslike NO$\nu$A, T2K and DUNE offer good prospects for determining the octant of$\theta_{23}$. However, their capability to do so may be compromised by thepossible presence of non-unitarity in the leptonic mixing matrix. In thispaper, we study in detail the octant degeneracy with and without non-unitarityat the level of oscillation probabilities and events for these experiments. Wealso analyze their octant sensitivity and discovery reach and show that theyare hampered in the presence of non-unitarity.

Octant of $\theta_{23}$ at long baseline neutrino experiments in the light of Non Unitary Leptonic mixing