Taming flavour violation in the Inverse Seesaw
Abstract The Inverse Seesaw mechanism remains one of the most attractive explanations for the lightness of neutrino masses, allowing for natural low-scale realisations. We consider the prospects of a simple extension via 3 generations of sterile fermions — the so called ISS(3) — in what concerns num...
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SpringerOpen
2025-04-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP04(2025)027 |
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| author | Jonathan Kriewald Ana M. Teixeira |
| author_facet | Jonathan Kriewald Ana M. Teixeira |
| author_sort | Jonathan Kriewald |
| collection | DOAJ |
| description | Abstract The Inverse Seesaw mechanism remains one of the most attractive explanations for the lightness of neutrino masses, allowing for natural low-scale realisations. We consider the prospects of a simple extension via 3 generations of sterile fermions — the so called ISS(3) — in what concerns numerous lepton flavour observables. In order to facilitate a connection between the Lagrangian parameters and low-energy data, we systematically develop new parametrisations of the Yukawa couplings. Relying on these new parametrisations to explore the parameter space, we discuss the complementary role of charged lepton flavour violation searches in dedicated facilities, as well as in lepton colliders (FCC-ee and μTRISTAN). Our results reveal the strong synergy of the different indirect searches in probing the distinct flavour sectors of the model. In particular, we show that in the absence of radiative decays ℓ α → ℓ β γ, sizeable rates for Z-penguin dominated observables could hint at a non-trivially mixed and non-degenerate heavy spectrum. |
| format | Article |
| id | doaj-art-936fe27d88074ff8b8d89ef9077d7281 |
| institution | DOAJ |
| issn | 1029-8479 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj-art-936fe27d88074ff8b8d89ef9077d72812025-08-20T03:09:34ZengSpringerOpenJournal of High Energy Physics1029-84792025-04-012025412210.1007/JHEP04(2025)027Taming flavour violation in the Inverse SeesawJonathan Kriewald0Ana M. Teixeira1Jožef Stefan InstitutLaboratoire de Physique de Clermont Auvergne (UMR 6533), CNRS/IN2P3, Université Clermont AuvergneAbstract The Inverse Seesaw mechanism remains one of the most attractive explanations for the lightness of neutrino masses, allowing for natural low-scale realisations. We consider the prospects of a simple extension via 3 generations of sterile fermions — the so called ISS(3) — in what concerns numerous lepton flavour observables. In order to facilitate a connection between the Lagrangian parameters and low-energy data, we systematically develop new parametrisations of the Yukawa couplings. Relying on these new parametrisations to explore the parameter space, we discuss the complementary role of charged lepton flavour violation searches in dedicated facilities, as well as in lepton colliders (FCC-ee and μTRISTAN). Our results reveal the strong synergy of the different indirect searches in probing the distinct flavour sectors of the model. In particular, we show that in the absence of radiative decays ℓ α → ℓ β γ, sizeable rates for Z-penguin dominated observables could hint at a non-trivially mixed and non-degenerate heavy spectrum.https://doi.org/10.1007/JHEP04(2025)027Electroweak Precision PhysicsLepton Flavour Violation (charged)Specific BSM Phenomenology |
| spellingShingle | Jonathan Kriewald Ana M. Teixeira Taming flavour violation in the Inverse Seesaw Journal of High Energy Physics Electroweak Precision Physics Lepton Flavour Violation (charged) Specific BSM Phenomenology |
| title | Taming flavour violation in the Inverse Seesaw |
| title_full | Taming flavour violation in the Inverse Seesaw |
| title_fullStr | Taming flavour violation in the Inverse Seesaw |
| title_full_unstemmed | Taming flavour violation in the Inverse Seesaw |
| title_short | Taming flavour violation in the Inverse Seesaw |
| title_sort | taming flavour violation in the inverse seesaw |
| topic | Electroweak Precision Physics Lepton Flavour Violation (charged) Specific BSM Phenomenology |
| url | https://doi.org/10.1007/JHEP04(2025)027 |
| work_keys_str_mv | AT jonathankriewald tamingflavourviolationintheinverseseesaw AT anamteixeira tamingflavourviolationintheinverseseesaw |