Complementarity Between Hyperkamiokande and DUNE in Determining Neutrino Oscillation Parameters

Understand

In this work we investigate the sensitivity to the neutrino mass hierarchy, the octant of the mixing angle $\theta_{23}$ and the CP phase $\delta_{CP}$ in the future long-baseline experiments T2HK and DUNE as well as in the atmospheric neutrino observation at Hyperkamiokande (HK).

• We show for the first time that the sensitivity is enhanced greatly if we combine these three experiments.
• Our results show that the hierarchy sensitivity of both T2HK and HK are limited due to the presence of parameter degeneracy.
• But this degeneracy is removed when T2HK and HK are added together.