Probing non-unitary neutrino mixing via long-baseline neutrino oscillation experiments based at J-PARC

Abstract

This paper investigates the capability of long-baseline experiments, which are making use of neutrinos that are coming from Japan Proton Accelerator Research Complex (J-PARC), in establishing the unitarity of active-neutrino mixing by ruling out the non-unitary mixing scheme as a function of true values of CP-violating phase ${\delta }_{\mathrm{CP}}$. It is found that T2HK can establish unitarity of active neutrino mixing at above 2$\sigma$ C.L. irrespective of neutrino mass hierarchy and true value of ${\delta }_{CP}$, if non-unitary (NU) parameter ${\alpha }_{21}$ is of the order of $10^{-2}$. Further, this paper is also discuss the bound on NU parameter in 21 sector and sensitivity limit of these experiments in determining NU parameter. It is found that the bounds on $\left({\alpha }_{21}/2\right)$ are 0.028, 0.0026, 0.005 at 2$\sigma$ C.L. respectively for T2K, T2HK, and T2HKK. Moreover, it is also found that the sensitivity limit of T2HK on NU parameter is far better than that of both T2HKK and T2K.

19 pages, 9 figures

References in corpus (11)

• Unitarity of the Leptonic Mixing Matrix
• Non-Standard Neutrino Interactions with Matter from Physics Beyond the Standard Model
• Non-unitarity of the leptonic mixing matrix: Present bounds and future sensitivities
• Non-unitary neutrino mixing and CP violation in the minimal inverse seesaw model
• Lepton flavor violation in low-scale seesaw models: SUSY and non-SUSY contributions
• Testing non-unitarity of neutrino mixing matrices at neutrino factories
• Neutrino Oscillation Physics Potential of the T2K Experiment
• Current and Future Neutrino Oscillation Constraints on Leptonic Unitarity
• Non-unitary neutrino mixing in short and long-baseline experiments
• Probing CP violation with T2K, NO$\nu$A and DUNE in the presence of non-unitarity
• Global oscillation data analysis on the $3\nu$ mixing without unitarity

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• Leptonic neutral-current probes in a short-distance DUNE-like setup
• Lepton-flavor changing decays and non-unitarity in the inverse seesaw mechanism
• Effects of virtual Majorana neutrinos on charged Lepton Flavor Violation decays from a seesaw variant with radiatively induced light neutrino masses
• Testing lepton non-unitarity with the next generation of Germanium-based CE$\nu$NS reactor experiments