Speaker
Description
Recent advancement in Neutrino Oscillation study has reached the precision era and hence a highly precise measurement of $\theta_{23}$ mixing angle takes a prime role to address long-standing flavor problems by ruling out different theoretical mass models. Two highly promising future long-baseline experiments DUNE and T2HK can serve us to pin down the atmospheric neutrino oscillation parameters with significantly high precision. The latest global fit analyses of world oscillation data under 3$\nu$-paradigm show 1.6$\sigma$ indications for lower $\theta_{23}$ octant and favor normal mass ordering (NMO) at 2.5$\sigma$ hint. In this work, we find that, the individual performance of DUNE [5 yrs $\nu$ + 5 yrs $\bar{\nu}$] and T2HK [2.5 yrs $\nu$ + 7.5 yrs $\bar{\nu}$] can improve relative 1$\sigma$ precision on $\sin^2\theta_{23}$ ($\Delta m^2_{31}$) of current canvas of global oscillation data significantly. Further the combined performance of DUNE and T2HK enhances the present fit by a factor of 7.64 (5.45). We show that DUNE (T2HK) can resolve octant of $\theta_{23}$ at 5 (4.42)$\sigma$ confidence level with the present global neutrino oscillation data. We also show the possible correlations and degeneracies among $\sin^2\theta_{23}$, $\Delta m^2_{31}$ in the neutrino, antineutrino, and their combined modes. It is remarkable that the combined antineutrino data of DUNE and T2HK can exclude the wrong octant solution at 3$\sigma$ C.L but cannot attain the same in the neutrino mode.
| Session | Neutrino Physics |
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