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arXiv 1707.02306hep-ph
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电弱重子生成的最小费米子模型

The minimal fermionic model of electroweak baryogenesis

Daniel Egana-Ugrinovic

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30 + 10 pages, 6 figures
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摘要：

提出了费米子诱导的电弱重子生成的极小模型。该模型由一个扩展的标准模型与一个电弱单重态费米子和一对矢量一样的二重态费米子与重正化耦合到希格斯玻色子。一个强的一级相变是由单重态-二重态费米子辐射引起的，而重子不对称性的起源是由于同一组费米子在膨胀的电弱泡壁上的不对称反射。单重态-二重态费米子通过手征对称性稳定在电弱尺度下，而Higgs势通过来自多TeV紫外线完成的阈值修正稳定，该紫外线完成在相变中不起任何重要作用。我们的工作在背景对称性不变量和重子不对称性进行了半经典的分析计算，表明该模型可以有效地产生观察到的重子不对称性的百分比水平值的唯一不变CP违反单重态-二重态部门的阶段。我们包括一个详细的研究电子电偶极矩和电弱精度限制，并为一个典型的基准方案，我们也重铸现有的对撞机的限制，表明该模型是符合所有当前的实验数据。指出在$13 \, \textrm{TeV}$ LHC中，费米子诱导的电弱重子生成具有不可约的现象，因为新的费米子必须处于电弱尺度，具有电弱量子数，并与Higgs强耦合。最有希望的搜索涉及多轻子和最终状态丢失能量的拓扑结构。

英文摘要：

We present the minimal model of electroweak baryogenesis induced by fermions. The model consists of an extension of the Standard Model with one electroweak singlet fermion and one pair of vector like doublet fermions with renormalizable couplings to the Higgs. A strong first order phase transition is radiatively induced by the singlet-doublet fermions, while the origin of the baryon asymmetry is due to asymmetric reflection of the same set of fermions on the expanding electroweak bubble wall. The singlet-doublet fermions are stabilized at the electroweak scale by chiral symmetries and the Higgs potential is stabilized by threshold corrections coming from a multi-TeV ultraviolet completion which does not play any significant role in the phase transition. We work in terms of background symmetry invariants and perform an analytic semiclassical calculation of the baryon asymmetry, showing that the model may effectively generate the observed baryon asymmetry for percent level values of the unique invariant CP violating phase of the singlet-doublet sector. We include a detailed study of electron electric dipole moment and electroweak precision limits, and for one typical benchmark scenario we also recast existing collider constraints, showing that the model is consistent with all current experimental data. We point out that fermion induced electroweak baryogenesis has irreducible phenomenology at the $13 \, \textrm{TeV}$ LHC since the new fermions must be at the electroweak scale, have electroweak quantum numbers and couple strongly with the Higgs. The most promising searches involve topologies with multiple leptons and missing energy in the final state.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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