Résumé
We present a class of dark matter models, in which the dark matter particle is afeebly interacting massive particle (FIMP) produced via the decay of anelectrically charged and/or colored parent particle. Given the feebleinteraction, dark matter is produced via the freeze-in mechanism and the parentparticle is long-lived. The latter leads to interesting collider signatures. Westudy current LHC constrains on our models arsing from searches for heavycharged particles, disappearing tracks, displaced leptons and displacedvertices. We demonstrate not only that collider searches can be a powerful probeof the freeze-in dark matter models under consideration, but that an observationcan lead as well to interesting insights on the reheating temperature and thuson the validity of certain baryogenesis models.