Atmospheric Mass-Squared Splitting at Sub-Percent Precision as a $CPT$ Symmetry Probe
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| Format: | Preprint |
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2026
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| author | Ngoc, T. V. Cao, S. Quyen, P. T. |
| author_facet | Ngoc, T. V. Cao, S. Quyen, P. T. |
| contents | In this paper, we present an improved test of $CPT$ symmetry in the neutrino sector by analyzing the atmospheric mass-squared splittings, $Δm^2_{31}$ and $Δ\overline{m}^2_{31}$, using on-going JUNO and future DUNE and Hyper-Kamiokande experiments. Our study focuses on the discrepancy $δ_{ν\overlineν}(Δm^2_{31}) = Δm^2_{31} - Δ\overline{m}^2_{31}$, achieving unprecedented precision by exploiting the high statistics and reduced systematic uncertainties of these facilities. The combined analysis yields a sensitivity to $CPT$ violation at the level of $2\times 10^{-5}~\text{eV}^2$ at $3σ$ confidence level, representing a $60\%$ improvement over the joint T2K-NO$ν$A-JUNO analysis. These results highlight the crucial role of multi-experiment synergies in testing fundamental symmetries of nature. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2601_07269 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Atmospheric Mass-Squared Splitting at Sub-Percent Precision as a $CPT$ Symmetry Probe Ngoc, T. V. Cao, S. Quyen, P. T. High Energy Physics - Phenomenology High Energy Physics - Experiment In this paper, we present an improved test of $CPT$ symmetry in the neutrino sector by analyzing the atmospheric mass-squared splittings, $Δm^2_{31}$ and $Δ\overline{m}^2_{31}$, using on-going JUNO and future DUNE and Hyper-Kamiokande experiments. Our study focuses on the discrepancy $δ_{ν\overlineν}(Δm^2_{31}) = Δm^2_{31} - Δ\overline{m}^2_{31}$, achieving unprecedented precision by exploiting the high statistics and reduced systematic uncertainties of these facilities. The combined analysis yields a sensitivity to $CPT$ violation at the level of $2\times 10^{-5}~\text{eV}^2$ at $3σ$ confidence level, representing a $60\%$ improvement over the joint T2K-NO$ν$A-JUNO analysis. These results highlight the crucial role of multi-experiment synergies in testing fundamental symmetries of nature. |
| title | Atmospheric Mass-Squared Splitting at Sub-Percent Precision as a $CPT$ Symmetry Probe |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2601.07269 |