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

Abstract

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. The stability of the dark particles is protected by the $U(1{)}_x$ gauge symmetry. A kinetic mixing between the $U(1{)}_x$ and the $U(1{)}_Y$ gauge bosons allows for dissipation of the symmetric component of dark matter. The case when $U(1{)}_x$ is $U(1{)}_{B-L}$ is also discussed for the supersymmetric case. This case is particularly interesting in that we have a gauged $U(1{)}_{B-L}$ which ensures the conservation of $B-L$ with an initial condition of a vanishing $B-L$ in the universe. Phenomenological implications of the proposed extensions are discussed, which include implications for electroweak physics, neutrino masses and mixings, and lepton flavor changing processes such as ${\ell }_i\to {\ell }_j\gamma$. We also briefly discuss the direct detection of the dark matter in the model.

9 pages, 3 figures

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• Annihilation Signals from Asymmetric Dark Matter
• Self-interacting hidden sector dark matter, small scale galaxy structure anomalies, and a dark force
• Minimal nonabelian model of atomic dark matter
• Moduli induced cogenesis of baryon asymmetry and dark matter
• Twin Cogenesis
• A long-lived stop with freeze-in and freeze-out dark matter in the hidden sector
• Sharing but not Caring: Dark Matter and the Baryon Asymmetry of the Universe
• An Analysis of B-L=-2 Operators from Matter-Higgs Interactions in a Class of Supersymmetric SO(10) Models
• Expanding the parameter space of natural supersymmetry
• Baryogenesis and Dark Matter in $U(1)$ Extensions
• Gauge-independent Gravitational Waves from Cogenesis in a $B-L$ Conserving Universe
• A Closer Look in the Mirror: Reflections on the Matter/Dark Matter Coincidence
• Cogenesis of visible and dark matter in type-I Dirac seesaw