Speaker
Description
Heavy neutral leptons (HINLs) provide a minimal and testable origin of neutrino masses and cangenerate the baryon asymmetry through low-scale leptogenesis. Their small active sterile mixinghowever, makes much of the theoretically motivated parameter space inaccessible to existing experimentsWe show that a future high-energy muon facility can operate as a heavy-neutrino factory and muon colliderWe study four complementary search modes: HNL production in muon decays, a high-energy muonbeam dump, an atmospheric beam dump using the Earth as a target, and deep-inelastic productionat a muon-ion collider. These searches probe HINL masses from below the muon mass to approximately 100 GeVand improve sensitivity to muon-flavor mixing by several orders of magnitude. A substantial partof the parameter space compatible with the type-I seesaw and Akhmedov-Rubakov-Smirov leptogenesis becomes experimentaly accessible.