Cogenesis in a universe with vanishing $B-L$ within a gauged $U(1)_x$ extension

Understand

We consider a gauged $U(1)_x$ extension of the standard model and of the minimal supersymmetric standard model where the dark matter fields are charged under $U(1)_x$ and carry lepton number while the standard model fields and fields of the minimal supersymmetric standard model are neutral under $U(1)_x$.

• We consider leptogenesis in this class of models with all fundamental interactions having no violation of lepton number, and the total $B-L$ in the universe vanishes.
• Such leptogenesis leads to equal and opposite lepton numbers in the visible sector and in the dark sector, and thus also produces asymmetric dark matter.
• Part of the lepton numbers generated in the leptonic sector subsequently transfer to the baryonic sector via sphaleron interactions.