Neutrino vs. Antineutrino Oscillation Parameters at DUNE and Hyper-Kamiokande

TL;DR

This paper assesses how upcoming neutrino experiments DUNE and Hyper-Kamiokande can test CPT symmetry by comparing neutrino and antineutrino oscillation parameters, potentially revealing new physics beyond the standard model.

Contribution

It provides a detailed analysis of the sensitivity of DUNE and Hyper-Kamiokande to CPT violation and their ability to distinguish neutrino and antineutrino oscillation parameters.

Findings

Both experiments can probe new levels of CPT-violation.

They can determine neutrino and antineutrino mass hierarchies and CP phases.

Potential to establish CPT-invariance violation if it exists.

Abstract

Testing, in a non-trivial, model-independent way, the hypothesis that the three-massive-neutrinos paradigm properly describes nature is among the main goals of the current and the next generation of neutrino oscillation experiments. In the coming decade, the DUNE and Hyper-Kamiokande experiments will be able to study the oscillation of both neutrinos and antineutrinos with unprecedented precision. We explore the ability of these experiments, and combinations of them, to determine whether the parameters that govern these oscillations are the same for neutrinos and antineutrinos, as prescribed by the CPT-theorem. We find that both DUNE and Hyper-Kamiokande will be sensitive to unexplored levels of leptonic CPT-violation. Assuming the parameters for neutrino and antineutrinos are unrelated, we discuss the ability of these experiments to determine the neutrino and antineutrino mass-hierarchies, atmospheric-mixing octants, and CP-odd phases, three key milestones of the experimental neutrino physics program. Additionally, if the CPT-theorem is violated in nature in a way that is consistent with all present neutrino and antineutrino oscillation data, we find that DUNE and Hyper-Kamiokande have the potential to ultimately establish CPT-invariance violation.