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

Abstract

The octant of the atmospheric mixing angle ${\theta }_{23}$ is still undetermined by neutrino oscillation experiments. Long-baseline experiments like 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 the possible presence of non-unitarity in the leptonic mixing matrix. In this paper, we study in detail the octant degeneracy with and without non-unitarity at the level of oscillation probabilities and events for these experiments. We also analyze their octant sensitivity and discovery reach and show that they are hampered in the presence of non-unitarity.

18 pages, 3 figures, modified version. Accepted for publication in Phys.Rev.D

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• Probing Direct and Indirect Unitarity Violation in Future Accelerator Neutrino Facilities
• Exploring the Potential of Short-Baseline Physics at Fermilab
• Resolving the atmospheric octant by an improved measurement of the reactor angle
• What measurements of neutrino neutral current events can reveal
• Non-Unitarity at DUNE and T2HK with Charged and Neutral Current Measurements
• Determination of the ${\theta }_{23}$ octant in long baseline neutrino experiments within and beyond the standard model
• Beyond Standard Neutrino Theory