Journal Article

Indirect searches for sterile neutrinos at a high-luminosity Z-factory

Orloff, J., Abada, A., De Romeri, V., Teixeira, A. M., Monteil, S.

2015

Overview

A bstract 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 ν MSM. 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.

• Publisher: Springer Berlin Heidelberg,Springer Nature B.V
• Subject: Classical and Quantum Gravitation / Elementary Particles / High energy physics / Physics / Physics and Astronomy / Quantum Field Theories / Quantum Field Theory / Quantum Physics / Regular Article - Theoretical Physics / Relativity Theory / String Theory