Servant Géraldine
DESY, Notkestraße 85, 22607 Hamburg, Germany
II. Institute of Theoretical Physics, University of Hamburg, 22761 Hamburg, Germany.
Philos Trans A Math Phys Eng Sci. 2018 Mar 6;376(2114). doi: 10.1098/rsta.2017.0124.
The origin of the matter-antimatter asymmetry of the universe remains unexplained in the Standard Model (SM) of particle physics. The origin of the flavour structure is another major puzzle of the theory. In this article, we report on recent work attempting to link the two themes through the appealing framework of electroweak (EW) baryogenesis. We show that Yukawa couplings of SM fermions can be the source of CP violation for EW baryogenesis if they vary at the same time as the Higgs is acquiring its vacuum expectation value, offering new avenues for EW baryogenesis. The advantage of this approach is that it circumvents the usual severe bounds from electric dipole moments. These ideas apply if the mechanism explaining the flavour structure of the SM is connected to EW symmetry breaking, as motivated for instance in Randall-Sundrum or Composite Higgs models. We compute the resulting baryon asymmetry for different configurations of the Yukawa coupling variation across the bubble wall and show that it can naturally be of the right order.This article is part of the Theo Murphy meeting issue 'Higgs cosmology'.
在粒子物理学的标准模型（SM）中，宇宙物质 - 反物质不对称的起源仍未得到解释。味结构的起源是该理论的另一个主要难题。在本文中，我们报告了最近的一项工作，该工作试图通过弱电（EW）重子生成这一引人注目的框架将这两个主题联系起来。我们表明，如果标准模型费米子的汤川耦合在希格斯玻色子获得其真空期望值的同时发生变化，那么它们可以成为弱电重子生成中CP破坏的来源，这为弱电重子生成提供了新途径。这种方法的优点是它规避了来自电偶极矩的通常严格限制。如果解释标准模型味结构的机制与弱电对称性破缺相关联，例如在兰德尔 - 桑德鲁姆模型或复合希格斯模型中所设想的那样，那么这些观点就适用。我们计算了汤川耦合在泡壁上不同变化配置所产生的重子不对称性，并表明其大小自然可以是合适的量级。本文是西奥·墨菲会议特刊“希格斯宇宙学”的一部分。
