Impact of unitarity violation on sensitivity of the leptonic CP phase at Hyper-Kamiokande and DUNE

2025/02/15 by Trzeciak, Ana Maria Garcia, Nunokawa, Hiroshi, Quiroga, Alexander Arguello
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2502.10873

Abstract

We study the impact of unitarity violation on the sensitivity of the leptonic CP phase, δ_CP, considering the next generation of long-baseline neutrino experiments, Hyper-Kamiokande and DUNE. By simulating near and far detectors and assuming different scenarios for non-unitarity, we verify how it can affect the sensitivity to measure the δ _CP violating phase. We also probe the capability of these experiments to constrain the non-unitarity parameters and how their capability could be improved if the impact of non-unitarity at both near and the far detectors were properly taken into account. We find that the Hyper-Kamiokande experiment is robust in the presence of non-unitarity mixing, achieving a sensitivity above 5σ for our all considered cases. On the other hand, DUNE suffers somewhat more impact due to unitarity violation, reaching a sensitivity below 5σ for some values of δ_CP. However, depending on the scenario adopted for non-unitarity, DUNE demonstrates robustness in the sensitivity to δ _CP phase.

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