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.

中文翻译：

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转换驱动的 Leptogenesis：电弱尺度的暗物质和重子发生的可测试理论


暗物质现象和重子不对称性是当今基础物理学中最紧迫的两个问题。转换驱动的冻结已成为生成观察到的暗物质遗迹密度的成功机制。尽管暗物质的耦合非常弱，但它支持暗物质的热化，这与直接和间接探测实验的零结果一致。在这封信中，我们证明了由半有效转换引起的暗物质偏离平衡满足萨哈罗夫的条件，为暗物质和重子不对称性提供了新的解释。具体来说，对于嗜钩模型，我们建立了转换驱动的钩端发生机制。该情景预测接近电弱尺度的暗物质质量，提供可测试的预测，例如 LHC 和未来对撞机的软位移轻子。