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We analyze the sensitivity achievable by the current and near-future water(ice)-Cherenkov atmospheric neutrino experiments in the context of standard three-flavor neutrinos oscillations. In this study, we perform an in-depth analysis of the current shared systematic uncertainties arising from the common flux and neutrino-water interactions. We then implement the systematic uncertainties of each experiment and develop the atmospheric neutrino simulations for Super-Kamiokande (SK), with and without neutron-tagging capabilities (SuperK-Gd), IceCube-Upgrade, and ORCA experiments. A careful review of the synergies and features of these experiments is carried out to examine the potential of a joint analysis of these atmospheric neutrino data in resolving the θ23 octant and the neutrino mass ordering. Finally, we assess the capability to constraint θ13 and the CP -violating phase (δCP ) in the leptonic sector independently from reactor and accelerator neutrino data.

Atmospheric neutrinos have played a crucial role in discovering neutrino oscillations, the only evidence of non-zero neutrino masses. Even now, they contribute significantly to our understanding of neutrino oscillations and mixing in the lepton sector. This talk analyzes the expected sensitivity of current and near-future water(ice)-Cherenkov atmospheric neutrino experiments. In this first in-depth combined atmospheric neutrino analysis, we carefully review the synergies and features of Super-Kamiokande, IceCube-Upgrade, and ORCA to examine the potential of joint analysis. By a detailed study of the current shared systematic uncertainties arising from the shared flux and neutrino-water interactions, and the systematic uncertainties of each experiment, we probe that the octant of 𝜃 23 can be resolved at 99% C.L. and the neutrino mass ordering above 5𝜎 by 2030. Additionally, we assess the capability to constraint 𝜃 13 and the CP-violating phase (𝛿 𝐶 𝑃 ) in the leptonic sector providing vital information for next-generation neutrino oscillation experiments.