Charged lepton flavor violating decays $Z\to \ell_α\ell_β$ in the inverse seesaw
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arXiv
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| Formato: | Preprint |
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2026
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| _version_ | 1866911421213704192 |
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| author | González-Quiterio, Adrián Novales-Sánchez, Héctor |
| author_facet | González-Quiterio, Adrián Novales-Sánchez, Héctor |
| contents | After confirmation of massiveness and mixing of neutrinos, by neutrino oscillation data, the origin of neutrino mass and the occurrence of charged-lepton-flavor non-conservation in nature have become two main objectives for the physics of elementary particles. Taking inspiration from both matters, we address the decays $Z\to\ell_α\ell_β$, with $\ell_α\ne\ell_β$, thus violating charged-lepton flavor. We calculate the set of contributing one-loop diagrams characterized by virtual neutral leptons, both light and heavy, emerged from the inverse seesaw mechanism for the generation of neutrino mass. By neglecting charged-lepton and light-neutrino masses, and then assuming that the mass spectrum of the heavy neutral leptons is degenerate, we find that a relation $\textrm{Br}\big( Z\to\ell_α\ell_β\big)\propto\big| η_{βα} \big|^2$, with $η$ the matrix describing non-unitarity effects in light-lepton mixing, is fulfilled. Our quantitative analysis, which considers both scenarios of degenerate and non-degenerate masses of heavy neutral leptons, takes into account upper bounds on $η_{μe}$, imposed by current constraints on the decay $μ\to eγ$ from the MEG II experiment, while projected future sensitivity of this experiment is considered as well. We find that, even though current constraints on $Z\to\ell_α\ell_β$, by the ATLAS Collaboration, remain far from inverse-seesaw contributions, improved sensitivity from in-plans machines, such as the Future Circular Collider and the Circular Electron Positron Collider, shall be able to probe this mass-generating mechanism through these decays. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_04168 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Charged lepton flavor violating decays $Z\to \ell_α\ell_β$ in the inverse seesaw González-Quiterio, Adrián Novales-Sánchez, Héctor High Energy Physics - Phenomenology After confirmation of massiveness and mixing of neutrinos, by neutrino oscillation data, the origin of neutrino mass and the occurrence of charged-lepton-flavor non-conservation in nature have become two main objectives for the physics of elementary particles. Taking inspiration from both matters, we address the decays $Z\to\ell_α\ell_β$, with $\ell_α\ne\ell_β$, thus violating charged-lepton flavor. We calculate the set of contributing one-loop diagrams characterized by virtual neutral leptons, both light and heavy, emerged from the inverse seesaw mechanism for the generation of neutrino mass. By neglecting charged-lepton and light-neutrino masses, and then assuming that the mass spectrum of the heavy neutral leptons is degenerate, we find that a relation $\textrm{Br}\big( Z\to\ell_α\ell_β\big)\propto\big| η_{βα} \big|^2$, with $η$ the matrix describing non-unitarity effects in light-lepton mixing, is fulfilled. Our quantitative analysis, which considers both scenarios of degenerate and non-degenerate masses of heavy neutral leptons, takes into account upper bounds on $η_{μe}$, imposed by current constraints on the decay $μ\to eγ$ from the MEG II experiment, while projected future sensitivity of this experiment is considered as well. We find that, even though current constraints on $Z\to\ell_α\ell_β$, by the ATLAS Collaboration, remain far from inverse-seesaw contributions, improved sensitivity from in-plans machines, such as the Future Circular Collider and the Circular Electron Positron Collider, shall be able to probe this mass-generating mechanism through these decays. |
| title | Charged lepton flavor violating decays $Z\to \ell_α\ell_β$ in the inverse seesaw |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2602.04168 |