Stringent constraint on CPT violation with the synergy of T2K-II, NO$\nu$A extension, and JUNO

Abstract

Neutrino oscillation experiments have measured precisely the mass-squared differences of three neutrino mass eigenstates, and three leptonic mixing angles by utilizing both neutrino and anti-neutrino oscillations. The possible CPT violation may manifest itself in the difference of neutrino and anti-neutrino oscillation parameters, making these experiments promising tools for testing CPT invariance. We investigate empirically the sensitivity of the CPT test via the difference in mass-squared splittings ($\Delta m_{31}^2-\Delta {\overline{m}}_{31}^2$) and in leptonic mixing angles (${\sin }^2{\theta }_{23}-{\sin }^2{\overline{\theta }}_{23}$) with the synergy of T2K-II, NO$\nu$A extension, and JUNO experiments. If the CPT symmetry is found to be conserved, the joint analysis of the three experiments will be able to establish limits of $|\Delta m_{31}^2-\Delta {\overline{m}}_{31}^2|$ < $5.3\times 10^{-3}{\text{eV}}^2$ and $|{\sin }^2{\theta }_{23}-{\sin }^2{\overline{\theta }}_{23}|$ < $0.10$ at 3$\sigma$ C. L. on the possible CPT violation. We find that with ($\Delta m_{31}^2-\Delta {\overline{m}}_{31}^2$), the dependence of the statistical significance on the relevant parameters to exclude the CPT conservation is marginal, and that, if the difference in the best-fit values of $\Delta m_{31}^2$ and $\Delta {\overline{m}}_{31}^2$ measured by MINOS(+) and NO$\nu$A persists as the true, the combined analysis will rule out the CPT conservation at 4$\sigma$ C. L.. With the (${\sin }^2{\theta }_{23}-{\sin }^2{\overline{\theta }}_{23}$), the statistical significance to exclude CPT invariance depends strongly on the true value of ${\theta }_{23}({\overline{\theta }}_{23})$. In case of maximal mixing of ${\theta }_{23}$, the CPT conservation will be excluded at 3$\sigma$ C. L. or more if the difference in the best-fit values of ${\theta }_{23}$ and ${\overline{\theta }}_{23}$ remains as the true.

arXiv comment10 pages, 10 figures

References in corpus (21)

• Data Tables for Lorentz and CPT Violation
• The T2K Experiment
• Simulation of long-baseline neutrino oscillation experiments with GLoBES
• 2020 Global reassessment of the neutrino oscillation picture
• New features in the simulation of neutrino oscillation experiments with GLoBES 3.0
• Constraint on the Matter-Antimatter Symmetry-Violating Phase in Neutrino Oscillations
• Measurement of Neutrino and Antineutrino Oscillations Using Beam and Atmospheric Data in MINOS
• CPT-odd Resonances in Neutrino Oscillations
• Sub-percent Precision Measurement of Neutrino Oscillation Parameters with JUNO
• CPT Violation and the Nature of Neutrinos
• Precision constraints for three-flavor neutrino oscillations from the full MINOS+ and MINOS data set
• Medium effects for terrestrial and atmospheric neutrino oscillations
• The Earth Mantle-Core Effect in Matter-Induced Asymmetries for Atmospheric Neutrino Oscillations
• Neutrinos, DUNE and the world best bound on CPT invariance
• Extrinsic CPT Violation in Neutrino Oscillations in Matter
• CPT Tests: Kaon vs Neutrinos
• Extrinsic and Intrinsic CPT Asymmetries in Neutrino Oscillations
• Physics potentials with a combined sensitivity of T2K-II, NO$\nu$A extension and JUNO
• T2K measurements of muon neutrino and antineutrino disappearance using $3.13\times 10^{21}$ protons on target
• Fake CPT Violation in Disappearance Neutrino Oscillations
• CPT and CP, an entangled couple

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