  We propose a WIMP baryogensis achieved by the annihilation of non-thermally
produced WIMPs from decay of heavy particles, which can result in low reheating
temerature. Dark matter (DM) can be produced non-thermally during a reheating
period created by the decay of long-lived heavy particle, and subsequently
re-annihilate to lighter particles even after the thermal freeze-out. The
re-annihilation of DM provides the observed baryon asymmetry as well as the
correct relic density of DM. We investigate how wahout effects can affect the
generation of the baryon asymmetry and study a model suppressing them. In this
scenario, we find that DM can be heavy enough and its annihilation cross
section can also be larger than that adopted in the usual thermal WIMP
baryogenesis.
