Speaker
Description
Future lepton colliders such as CEPC and FCC-ee are capable of producing trillions of Z-bosons. Such Tera-Z factories can discover new elementary particles with couplings to the Z-boson several orders of magnitude smaller than current bounds, and could also measure the new particles' properties in detail. Using simple analytic estimates, we quantify how the discovery reach and measurement precision in long-lived particle searches depend on the number of Z-bosons and on the detector dimensions, allowing a quick sensitivity assessment for a given design. Under optimistic assumptions, long-lived particles such as heavy neutral leptons and axion-like particles could be produced in the millions and billions, respectively, effectively turning future lepton colliders into exotics factories.
