Collider search of light dark matter model with dark sector decay

Abstract We explore the possibility that dark matter relic density is not produced by a thermal mechanism directly, but decay of other heavier dark-sector particles which themselves can be freeze-out mechanism. Using concrete model with light from sector decay, we study collider signature associated Higgs production processes. find future lepton colliders could better place to probe this kind than hadron such as LHC. Also, factory center-of-mass energy 250 GeV has potential resolve 350 GeV.