AI 中文总结
该研究在SMEFT框架下探究sphalerogenesis机制，引入七个CP破坏八维算符，发现其中五个可解释宇宙重子不对称性，且单圈产生的八维算符贡献可与六维算符相当，凸显圈阶计数的重要性。
AI 中文摘要
我们研究在标准模型有效场论（SMEFT）框架内，一种名为 sphalerogenesis 的重子生成机制能否解释观测到的宇宙重子不对称性。该场景中，重子不对称性通过电弱（EW）类 sphaleron 转变的 CP 不对称退耦产生。我们引入七个由希格斯二重态和 SU(2)_L 规范场构成的 CP 破坏八维算符，证明其中五个算符可单独解释观测到的重子不对称性，且满足对撞机或电子电偶极矩测量的实验约束。我们进一步研究存在 CP 破坏六维算符时这些算符的影响，发现当八维算符在单圈产生时，其贡献可与六维算符的贡献相当，表明圈阶计数在 sphalerogenesis 中与正则质量维度计数同样重要。
英文摘要
We investigate whether a baryogenesis mechanism known as sphalerogenesis can account for the observed baryon asymmetry of the Universe within the Standard Model effective field theory. In this scenario, the baryon asymmetry is generated through the $CP$-asymmetric decoupling of electroweak (EW) sphaleron-like transitions. We introduce seven $CP$-violating dimension-8 operators constructed from the Higgs doublet and the $SU(2)_L$ gauge fields and show that five of them can individually account for the observed baryon asymmetry with satisfying experimental constraints from colliders or electron electric dipole moment measurements. We further study their impact in the presence of a $CP$-violating dimension-6 operator. We find that the dimension-8 contributions can be comparable to the dimension-6 contribution when the dimension-8 operators are generated at one loop, demonstrating that loop-order counting can be as important as canonical mass-dimension counting in sphalerogenesis.
Comments18 pages, 3 figures
