Heavy neutral lepton corrections to SM boson decays: lepton flavour universality violation in low-scale seesaw realisations
| Autor: | Abada, A., Kriewald, J., Pinsard, E., Rosauro-Alcaraz, S., Teixeira, A. M. |
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| Přispěvatelé: | Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique de Clermont (LPC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA) |
| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: |
lepton
flavor lepton flavor universality lepton flavor violation neutrino model FOS: Physical sciences universality violation FCC-ee flavor violation neutrino mass generation boson decay lepton charge seesaw model High Energy Physics - Phenomenology higher-order 1 High Energy Physics - Phenomenology (hep-ph) invisible decay [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] electroweak interaction precision measurement conservation law flavor universality |
| Popis: | We study lepton flavour universality violation in SM boson decays in low-scale seesaw models of neutrino mass generation, also addressing other electroweak precision observables. We compute the electroweak next-to-leading order corrections, which turn out to be important - notably in the case of the invisible decay width of the $Z$ boson, for which the corrections can be as large as the current experimental uncertainty. As a well-motivated illustrative study case, we choose a realisation of the Inverse Seesaw mechanism, and discuss the complementary role of lepton flavour conserving, lepton flavour violating and precision observables, both in constraining and in probing such models of neutrino mass generation. Our findings suggest that invisible $Z$ decays are especially important, potentially at the origin of the most stringent constraints for certain regimes of the Inverse Seesaw (while complying with charge lepton flavour violation and other electroweak precision tests). We also discuss the probing power of the considered observables in view of the expected improvement in experimental precision at FCC-ee. 48 pages, 12 figures, 4 appendices |
| Databáze: | OpenAIRE |
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