Abstract
A future high-luminosity Z-factory will offer the possibility to study rare Z decays, as those leading to lepton flavour violating final states. Processes such as Z → ℓ ∓1 ℓ ±2 are potentially complementary to low-energy (high-intensity) observables of lepton flavour violation. In this work we address the impact of new sterile fermions on lepton flavour violating Z decays, focusing on potential searches at FCC-ee (TLEP), and taking into account experimental and observational constraints on the sterile states. We consider a minimal extension of the Standard Model by one sterile fermion state, and two well-motivated frameworks of neutrino mass generation, the Inverse Seesaw embedded into the Standard Model, and the νMSM. Our study shows that sterile neutrinos can give rise to contributions to BR(Z → ℓ ∓1 ℓ ±2 ) within reach of the FCC-ee. We also discuss the complementarity between a high-luminosity Z-factory and low-energy charged lepton flavour violation facilities.
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Abada, A., De Romeri, V., Monteil, S. et al. Indirect searches for sterile neutrinos at a high-luminosity Z-factory. J. High Energ. Phys. 2015, 51 (2015). https://doi.org/10.1007/JHEP04(2015)051
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DOI: https://doi.org/10.1007/JHEP04(2015)051