Zeren Simon Wang, Kechen Wang Physical Review D 101, 075046 (2020) https://doi.org/10.1103/PhysRevD.101.075046 Abstract At the Large Hadron Collider (LHC), several far detectors such as FASER and MATHUSLA have been proposed to target the long-lived particles (LLPs) featured with displaced vertices. Naturally one question arises as to the feasibility of installing similar far detectors at future lepton colliders like the CEPC and FCC-ee. Because of the different kinematics of

Kingman Cheung, Zeren Simon Wang Physical Review D 101, 035003 (2020) https://doi.org/10.1103/PhysRevD.101.035003 Abstract We study displaced vertex signatures of long-lived particles (LLPs) from exotic Higgs decays in the context of a Higgs-portal model and a neutral-naturalness model at the circular electron positron collider(CEPC) and future circular collider e^+ e^- (FCC-ee). Such two models feature two representative mass ranges for LLPs, which show very different behavi