Effects of BSMs on θ_23 determination

We investigate the prospects for determining the octant of θ_23 in the future long baseline oscillation experiments. We present our results as contour plots on the (θ_23-45^∘, δ)–plane, where δ is the CP phase, showing the true values of θ_23 for which the octant can be experimentally determined at 3σ, 2σ and 1σ confidence level, in particular, the impact of the non-unitarity of neutrino mixing.