Insights into 1-loop corrections to neutrino low-scale type-I seesaw mechanism
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866914455438229504 |
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| author | Miele, Gennaro Morisi, Stefano Peinado, Eduardo Qamar, Kainat |
| author_facet | Miele, Gennaro Morisi, Stefano Peinado, Eduardo Qamar, Kainat |
| contents | The standard type-I seesaw can also be regarded as a low-scale seesaw by using the freedom of the Casas-Ibarra parameterization. In this framework, radiative corrections to the neutrino mass matrix can dominate over the tree-level contribution. We show that a naive use of the Casas-Ibarra parametrization in the presence of 1-loop corrections leads to incorrect predictions for the neutrino oscillation parameters. By using a modified Casas-Ibarra parametrization, in which 1-loop corrections are reabsorbed into the right-handed neutrino mass matrix, we obtain a light neutrino mass matrix consistent with experimental values. On the other hand, we show that physical processes related to right-handed neutrino propagation, such as heavy neutral lepton searches, do not depend on the 1-loop corrections. Moreover, we show that ${\rm Br}(μ\to e γ)$ provides competitive constraints on the parameter space of heavy neutral lepton search experiments for masses above $100$ GeV. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_06345 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Insights into 1-loop corrections to neutrino low-scale type-I seesaw mechanism Miele, Gennaro Morisi, Stefano Peinado, Eduardo Qamar, Kainat High Energy Physics - Phenomenology The standard type-I seesaw can also be regarded as a low-scale seesaw by using the freedom of the Casas-Ibarra parameterization. In this framework, radiative corrections to the neutrino mass matrix can dominate over the tree-level contribution. We show that a naive use of the Casas-Ibarra parametrization in the presence of 1-loop corrections leads to incorrect predictions for the neutrino oscillation parameters. By using a modified Casas-Ibarra parametrization, in which 1-loop corrections are reabsorbed into the right-handed neutrino mass matrix, we obtain a light neutrino mass matrix consistent with experimental values. On the other hand, we show that physical processes related to right-handed neutrino propagation, such as heavy neutral lepton searches, do not depend on the 1-loop corrections. Moreover, we show that ${\rm Br}(μ\to e γ)$ provides competitive constraints on the parameter space of heavy neutral lepton search experiments for masses above $100$ GeV. |
| title | Insights into 1-loop corrections to neutrino low-scale type-I seesaw mechanism |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2604.06345 |