dorsal/arxiv
View SchemaAtmospheric Mass-Squared Splitting at Sub-Percent Precision as a $CPT$ Symmetry Probe
| Authors | T. V. Ngoc, S. Cao, P. T. Quyen |
|---|---|
| Categories | |
| ArXiv ID | 2601.07269vv1 |
| URL | https://arxiv.org/abs/2601.07269 |
| License | http://creativecommons.org/licenses/by/4.0/ |
Abstract
In this paper, we present an improved test of $CPT$ symmetry in the neutrino sector by analyzing the atmospheric mass-squared splittings, $\Delta m^2_{31}$ and $\Delta \overline{m}^2_{31}$, using on-going JUNO and future DUNE and Hyper-Kamiokande experiments. Our study focuses on the discrepancy $\delta_{\nu\overline{\nu}}(\Delta m^2_{31}) = \Delta m^2_{31} - \Delta \overline{m}^2_{31}$, 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 $3\sigma$ confidence level, representing a $60\%$ improvement over the joint T2K-NO$\nu$A-JUNO analysis. These results highlight the crucial role of multi-experiment synergies in testing fundamental symmetries of nature.
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"abstract": "In this paper, we present an improved test of $CPT$ symmetry in the neutrino sector by analyzing the atmospheric mass-squared splittings, $\\Delta m^2_{31}$ and $\\Delta \\overline{m}^2_{31}$, using on-going JUNO and future DUNE and Hyper-Kamiokande experiments. Our study focuses on the discrepancy $\\delta_{\\nu\\overline{\\nu}}(\\Delta m^2_{31}) = \\Delta m^2_{31} - \\Delta \\overline{m}^2_{31}$, 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 $3\\sigma$ confidence level, representing a $60\\%$ improvement over the joint T2K-NO$\\nu$A-JUNO analysis. These results highlight the crucial role of multi-experiment synergies in testing fundamental symmetries of nature.",
"arxiv_id": "2601.07269",
"authors": [
"T. V. Ngoc",
"S. Cao",
"P. T. Quyen"
],
"categories": [
"hep-ph",
"hep-ex"
],
"license": "http://creativecommons.org/licenses/by/4.0/",
"title": "Atmospheric Mass-Squared Splitting at Sub-Percent Precision as a $CPT$ Symmetry Probe",
"url": "https://arxiv.org/abs/2601.07269",
"version": "v1"
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