  We propose a model which explains the baryon asymmetry of the universe and
dark matter relic density at the same time. In this model, dark matter
candidate is the dark baryon composed by dark quarks. A scalar mediator, which
couples to the standard model leptons and dark quarks, is introduced to
generate the asymmetry of baryon and dark baryon simultaneously. Direct
detection and collider detection of this model are studied. We find that
current underground direct detection experiments and LHC can hardly detect this
model. But future lepton colliders, such as CEPC, have great potential to
detect a large portion of the model parameter space by "displaced lepton jet"
signal.
