Conversion-Driven Leptogenesis: A Testable Theory of Dark Matter and Baryogenesis at the Electroweak Scale

Abstract

The phenomena of dark matter and the baryon asymmetry pose two of the most pressing questions in today's fundamental physics. Conversion-driven freeze-out has emerged as a successful mechanism to generate the observed dark matter relic density. It supports thermalization of dark matter despite its very weak couplings aligning with the null results from direct and indirect detection experiments. In this letter, we demonstrate that the departure from equilibrium of dark matter, induced by semi-efficient conversions, satisfies Sakharov's conditions, providing a novel explanation for both dark matter and the baryon asymmetry. Specifically, for a leptophilic model, we establish the mechanism of conversion-driven leptogenesis. The scenario predicts dark matter masses close to the electroweak scale offering testable predictions, such as soft displaced leptons at the LHC and future colliders.

5 pages + references, 4 figures; v2: presentation improved, references added, matches published version

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Cited by in corpus (8)

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• t-channel dark matter at the LHC -- a whitepaper
• Minimal effective theory for leptogenesis, dark matter, and neutrino masses
• Genesis of baryon and dark matter asymmetries through ultraviolet scattering freeze-in
• Illuminating Scalar Dark Matter Co-Scattering in EFT with Monophoton Signatures
• Cogenesis of visible and dark matter in a scotogenic model
• Reviving $Z^{\prime }$ Portal Dark Matter with Conversion Mechanism
• Dark Matter-Driven Low-Scale Leptogenesis via Neutrino Portal