Searches for Heavy Neutral Leptons at FCC-ee in final states including a muon

Abstract

The sensitivity of the CERN FCC-ee collider to the production of heavy neutral leptons (HNL) is investigated. The study focuses on a simplified model with a single low-mass HNL mixing with a muon, and addresses the fully leptonic and semileptonic decay modes of the HNL. Complete Monte Carlo analyses of signal and background based on a parametrised detector simulation are performed for the FCC-ee run at the $Z$-pole, resulting in an estimate of the intervals of the mixing parameter for which the FCC-ee will have a 95% CL sensitivity as a function of the HNL mass.

arXiv comment24 pages, 18 figures, 3 tables

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• New Particles at the Z-Pole: Tera-Z factories as discovery and precision machines