22-29 July 2015
Europe/Vienna timezone

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

Jul 23, 2015, 5:00 PM


talk Neutrino Physics Neutrino Physics


Valentina De Romeri (CNRS)


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. 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 one well-motivated framework of neutrino mass generation, the Inverse Seesaw embedded into the Standard Model. The results show 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.

Primary author


Ana M. Teixeira (LPC Clermont) Prof. Asmaa Abada (Laboratoire de Physique Theorique Orsay) Jean Orloff (Université Blaise Pascal - Clermont-Ferrand) Stephane Monteil (Univ. Blaise Pascal Clermont-Fe. II (FR))

Presentation materials