The existence of dark matter (DM) and the origin of the baryon asymmetry are
persistent indications that the SM is incomplete. More recently, the ATLAS and
CMS experiments have observed an excess of diphoton events with invariant mass
of about 750 GeV. One interpretation of this excess is decays of a new spin-0
particle with a sizable diphoton partial width, e.g. induced by new heavy
weakly charged particles. These are also key ingredients in models cogenerating
asymmetric DM and baryons via sphaleron interactions and an initial particle
asymmetry. We explore what consequences the new scalar may have for models of
asymmetric DM that attempt to account for the similarity of the dark and
visible matter abundances.Comment: 33 pages, 5 figure
