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30 May 2022 to 4 June 2022
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Can deviation from $\theta_{23} = 45^{\circ}$ be resolved in DUNE?

Not scheduled
Virtual Seoul

Virtual Seoul

Poster Neutrino oscillation Poster


Masoom Singh (Institute of Physics and Utkal University)


The present global analyses of the oscillation data do not agree on the octant in which the best-fit value of $\theta_{23}$ lies. Further, they allow $\sin^{2}\theta_{23}=0.5$ at 3$\sigma$ confidence level. Hence, it is imperative to question at what confidence level maximal 2-3 mixing can be ruled out. We study in detail the performance of DUNE to establish the deviation from maximal $\theta_{23}$. We also discuss the impact of $\sin^{2}\theta_{23} - \Delta m^{2}_{31}$ degeneracy in establishing non-maximal $\theta_{23}$ and show how this degeneracy can be resolved by exploiting the spectral shape information in $\nu$ and $\bar{\nu}$ disappearance events. We find that a 3$\sigma$ (5$\sigma$) determination of non-maximal $\theta_{23}$ is possible in DUNE with an exposure of 336 kt$\cdot$MW$\cdot$years if the true value of $\sin^2\theta_{23} <=0.465~(0.450)$ or $\sin^2\theta_{23} >= 0.554~(0.572)$ for any value of true $\delta_{\mathrm{CP}}$ and true NMO. We also study the individual contributions from appearance and disappearance channels, the impact of systematic uncertainties, and data from both $\nu$ and $\bar\nu$ runs, while analyzing DUNE's sensitivity for the discovery of a non-maximal $\theta_{23}$.

Primary authors

Masoom Singh (Institute of Physics and Utkal University) Prof. Sanjib Kumar Agarwalla (Institute of Physics, Bhubaneswar, HBNI, Mumbai, ICTP, Trieste,) Ritam Kundu (Institute of Physics, HBNI) Suprabh Prakash (The Institute of Mathematical Sciences)

Presentation Materials