Hall Lawrence J, Murayama Hitoshi, Perez Gilad
Theoretical Physics Group, Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
Phys Rev Lett. 2005 Sep 9;95(11):111301. doi: 10.1103/PhysRevLett.95.111301.
Electroweak baryogenesis, given a first-order phase transition, does not work in the standard model because the quark Yukawa matrices are too hierarchical. On the other hand, the neutrino mass matrix is apparently not hierarchical. In models with neutrino mass generation at low scales, the neutrino Yukawa couplings lead to large CP violation in the reflection probability of heavy leptons by the expanding Higgs bubble wall, and can generate the observed baryon asymmetry of the universe. The mechanism predicts new vectorlike leptons below the TeV scale and sizable mu --> e processes.
在标准模型中，给定一阶相变的情况下，弱电重子生成机制不起作用，因为夸克汤川矩阵的层级性太强。另一方面，中微子质量矩阵显然没有很强的层级性。在低能标下产生中微子质量的模型中，中微子汤川耦合会导致重轻子在希格斯泡壁膨胀时的反射概率出现大的CP破坏，并能产生观测到的宇宙重子不对称性。该机制预言在TeV能标以下存在新的类矢量轻子以及可观的μ→e过程。
