Constraining the Neutrino Mixing Matrix via Single-Sector Charged-Lepton Rotations in the JUNO Precision Era
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866915905058897920 |
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| author | Giarnetti, Alessio Marciano, Simone Meloni, Davide |
| author_facet | Giarnetti, Alessio Marciano, Simone Meloni, Davide |
| contents | The unprecedented precision now being achieved in the measurement of the Pontecorvo--Maki--Nakagawa--Sakata (PMNS) lepton mixing matrix opens a new window onto the underlying structure of the neutrino mass matrix and the possibly associated flavor symmetries. In this work, we investigate the constraints imposed on the unitary matrix $U_ν$ that diagonalises the neutrino mass matrix, under the hypothesis that the charged-lepton mixing matrix $U_l$ consists of a single two-by-two rotation in one of the three sectors: (1,2), (1,3), or (2,3). For this analysis, we considered the latest global fit which incorporates the precision measurement of $θ_{12}$ from the JUNO experiment. For each scenario, we also derive analytical expressions for the entries of $U_ν$ in terms of the measured PMNS parameters to obtain compact sum-rule-like formulae. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_29876 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Constraining the Neutrino Mixing Matrix via Single-Sector Charged-Lepton Rotations in the JUNO Precision Era Giarnetti, Alessio Marciano, Simone Meloni, Davide High Energy Physics - Phenomenology High Energy Physics - Theory The unprecedented precision now being achieved in the measurement of the Pontecorvo--Maki--Nakagawa--Sakata (PMNS) lepton mixing matrix opens a new window onto the underlying structure of the neutrino mass matrix and the possibly associated flavor symmetries. In this work, we investigate the constraints imposed on the unitary matrix $U_ν$ that diagonalises the neutrino mass matrix, under the hypothesis that the charged-lepton mixing matrix $U_l$ consists of a single two-by-two rotation in one of the three sectors: (1,2), (1,3), or (2,3). For this analysis, we considered the latest global fit which incorporates the precision measurement of $θ_{12}$ from the JUNO experiment. For each scenario, we also derive analytical expressions for the entries of $U_ν$ in terms of the measured PMNS parameters to obtain compact sum-rule-like formulae. |
| title | Constraining the Neutrino Mixing Matrix via Single-Sector Charged-Lepton Rotations in the JUNO Precision Era |
| topic | High Energy Physics - Phenomenology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2603.29876 |