Towards Measuring the CP-Violating Phase with Atmospheric Neutrinos
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866913134479933440 |
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| author | Beacom, John F. Bell, Nicole F. Dolan, Matthew J. Meighen-Berger, Stephan A. Yim, Ho Man |
| author_facet | Beacom, John F. Bell, Nicole F. Dolan, Matthew J. Meighen-Berger, Stephan A. Yim, Ho Man |
| contents | We propose a new approach to measuring the CP-violating phase in neutrino mixing using atmospheric neutrinos, differing significantly from prior work. We develop an up-down flux ratio for sub-GeV atmospheric neutrinos that incorporates realistic detection effects and reduces systematic uncertainties. For the example of Hyper-Kamiokande -- the first experiment with sufficient atmospheric-neutrino statistics in this energy range -- our approach can surpass the sensitivity of the Tokai to Hyper-Kamiokande (T2HK) long-baseline experiment near $\mathit{δ_\mathrm{CP} = 90^\circ}$ and $\mathit{270^\circ}$. Realizing this potential will require additional, but realistic, work to reduce theoretical uncertainties. Success will provide an important, complementary probe to multi-\$1B accelerator-based experiments. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2605_16721 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Towards Measuring the CP-Violating Phase with Atmospheric Neutrinos Beacom, John F. Bell, Nicole F. Dolan, Matthew J. Meighen-Berger, Stephan A. Yim, Ho Man High Energy Physics - Phenomenology We propose a new approach to measuring the CP-violating phase in neutrino mixing using atmospheric neutrinos, differing significantly from prior work. We develop an up-down flux ratio for sub-GeV atmospheric neutrinos that incorporates realistic detection effects and reduces systematic uncertainties. For the example of Hyper-Kamiokande -- the first experiment with sufficient atmospheric-neutrino statistics in this energy range -- our approach can surpass the sensitivity of the Tokai to Hyper-Kamiokande (T2HK) long-baseline experiment near $\mathit{δ_\mathrm{CP} = 90^\circ}$ and $\mathit{270^\circ}$. Realizing this potential will require additional, but realistic, work to reduce theoretical uncertainties. Success will provide an important, complementary probe to multi-\$1B accelerator-based experiments. |
| title | Towards Measuring the CP-Violating Phase with Atmospheric Neutrinos |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2605.16721 |