Can the next collider catch supersymmetric particles that barely decay?

In a leading supersymmetry model (GMSB), the stau—a heavy cousin of the tau lepton—decays so slowly it travels centimeters to meters through a detector before vanishing. This analysis shows how the FCC-ee, a planned high-energy collider, could spot these delayed decays via bent particle tracks and separated decay vertices, offering a new window on physics beyond the standard model.