Probing Direct and Indirect Unitarity Violation in Future Accelerator Neutrino Facilities

Abstract

The possible existence of light and heavy sterile neutrinos may give rise to direct and indirect unitarity violation of the $3\times 3$ lepton mixing matrix respectively. In the current work we study the potential of future accelerator neutrino facilities in probing the unitarity violation effects. Taking DUNE, T2HK and a low-energy Neutrino Factory (LENF) as working examples of future accelerator neutrino facilities, we study the distinct effects of direct and indirect unitarity violation on the discovery reach of the leptonic CP violation and precision measurements of ${\theta }_{23}$ in the three neutrino framework. In addition, constraints on the additional mixing parameters of direct and indirect unitarity violation are also discussed. Finally, we stress that the combination of experiments with different oscillation channels, different neutrino beams and different detector techniques will be an effective solution to the parameter degeneracy problem and give the robust measurement of leptonic CP violation even if the direct and indirect unitarity violation are taken into account.

19 pages, 6 figures

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Cited by in corpus (6)

• Non-standard interactions in SMEFT confronted with terrestrial neutrino experiments
• Precision measurements and tau neutrino physics in a future accelerator neutrino experiment
• Exploring the new physics phases in 3+1 scenario in neutrino oscillation experiments
• Baseline and other effects for a sterile neutrino at DUNE
• Sterile sector impacting the correlations and degeneracies among mixing parameters at the Deep Underground Neutrino Experiment
• New physics from oscillations at the DUNE near detector, and the role of systematic uncertainties