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Improved constraints on neutrino mixing from the T2K experiment with $\mathbf{3.13\times10^{21}}$ protons on target
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arxiv 2101.03779 v3 pith:2SN3K2J4 submitted 2021-01-11 hep-ex
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abstract
The T2K experiment reports updated measurements of neutrino and antineutrino oscillations using both appearance and disappearance channels. This result comes from an exposure of $14.9~(16.4) \times 10^{20}$ protons on target in neutrino (antineutrino) mode. Significant improvements have been made to the neutrino interaction model and far detector reconstruction. An extensive set of simulated data studies have also been performed to quantify the effect interaction model uncertainties have on the T2K oscillation parameter sensitivity. T2K performs multiple oscillation analyses that present both frequentist and Bayesian intervals for the PMNS parameters. For fits including a constraint on \ssqthonethree from reactor data and assuming normal mass ordering T2K measures $\sin^2\theta_{23} = 0.53^{+0.03}_{-0.04}$ and $\Delta{}m^2_{32} = (2.45 \pm 0.07) \times 10^{-3}$ eV$^{2}$c$^{-4}$. The Bayesian analyses show a weak preference for normal mass ordering (89% posterior probability) and the upper $\sin^2\theta_{23}$ octant (80% posterior probability), with a uniform prior probability assumed in both cases. The T2K data exclude CP conservation in neutrino oscillations at the $2\sigma$ level.
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Cited by 3 Pith papers
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In neutrino-portal dark matter, ignoring internal dark-sector interactions during freeze-in can underestimate the final relic abundance by 30–95%.
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hep-ph 2025-07 conditional novelty 5.0 of 10
A closed-form rephasing-invariant expression for the Dirac CP phase and a first-order expansion show charged-lepton mixing can shift the phase by up to about 30 degrees, within the expected reach of DUNE and T2HK.
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On T-Invariance Violation in Neutrino Oscillations and Matter Effects
hep-ph 2024-12 accept novelty 4.0 of 10
Matter-induced T-invariance violation in neutrino oscillations requires an asymmetric matter potential along the neutrino path, and for Earth-bound experiments the effect is numerically tiny.
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