Estimating JUNO's Sensitivity to Solar Neutrino-to-antineutrino Conversion and Neutrino Magnetic Moments
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| Format: | Preprint |
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2026
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| author | Ventura, C. V. Churata, Saul J. Panibra |
| author_facet | Ventura, C. V. Churata, Saul J. Panibra |
| contents | We investigated JUNO's sensitivity to a possible conversion of solar neutrinos into antineutrinos via the spin-flavor precession (SFP) mechanism, and assessed the implications for constraining the neutrino-magnetic moment (NMM). Using a sensitivity-based framework appropriate for counting experiments with no prior observations, we derive 90\% C.L.\ ensemble-average sensitivities on the solar antineutrino flux for 1.8--16.8 MeV and 8.0--16.8 MeV. For the entire energy window, the results do not improve the restrictions of other experiments; the relevance occurs in the highes-energy window. In this window, we report a flux of $ϕ_{\mathrm{lim}}\le 4.01\times10^{1}\ \mathrm{cm^{-2}\,s^{-1}}$ and a probability of $P_{ν_e\rightarrow\barν_e}\le 2.07\times10^{-5}$, the latter normalized to the ${}^8$B flux above threshold, $Φ_{\rm SSM}(E>8~\mathrm{MeV})$. Assuming transverse solar magnetic fields of $B_\perp=50$ and $100$~kG, the corresponding magnetic-moment sensitivities are $μ_ν\le 7.27\times10^{-11}\,μ_B$ and $3.64\times10^{-11}\,μ_B$ in the high-energy window. These results highlight that JUNO has the potential to achieve sensitivities comparable to the most stringent astrophysical limits; in particular, the high-energy selection (8.0--16.8~MeV) provides a sensitivity that is competitive with current results, while the full-energy window remains primarily limited by near-reactor backgrounds. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2601_03502 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Estimating JUNO's Sensitivity to Solar Neutrino-to-antineutrino Conversion and Neutrino Magnetic Moments Ventura, C. V. Churata, Saul J. Panibra High Energy Physics - Phenomenology We investigated JUNO's sensitivity to a possible conversion of solar neutrinos into antineutrinos via the spin-flavor precession (SFP) mechanism, and assessed the implications for constraining the neutrino-magnetic moment (NMM). Using a sensitivity-based framework appropriate for counting experiments with no prior observations, we derive 90\% C.L.\ ensemble-average sensitivities on the solar antineutrino flux for 1.8--16.8 MeV and 8.0--16.8 MeV. For the entire energy window, the results do not improve the restrictions of other experiments; the relevance occurs in the highes-energy window. In this window, we report a flux of $ϕ_{\mathrm{lim}}\le 4.01\times10^{1}\ \mathrm{cm^{-2}\,s^{-1}}$ and a probability of $P_{ν_e\rightarrow\barν_e}\le 2.07\times10^{-5}$, the latter normalized to the ${}^8$B flux above threshold, $Φ_{\rm SSM}(E>8~\mathrm{MeV})$. Assuming transverse solar magnetic fields of $B_\perp=50$ and $100$~kG, the corresponding magnetic-moment sensitivities are $μ_ν\le 7.27\times10^{-11}\,μ_B$ and $3.64\times10^{-11}\,μ_B$ in the high-energy window. These results highlight that JUNO has the potential to achieve sensitivities comparable to the most stringent astrophysical limits; in particular, the high-energy selection (8.0--16.8~MeV) provides a sensitivity that is competitive with current results, while the full-energy window remains primarily limited by near-reactor backgrounds. |
| title | Estimating JUNO's Sensitivity to Solar Neutrino-to-antineutrino Conversion and Neutrino Magnetic Moments |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2601.03502 |