Primordial Lepton Family Asymmetries in Seesaw Model
Primordial Lepton Family Asymmetries in Seesaw Model
复制标题
DOI：
10.1143/ptp.111.123
复制
发表时间：
2003-08
影响因子：
--
通讯作者：
T. Endoh;T. Morozumi;Zhaohua Xiong
中科院分区：
文献类型：
--
作者：
T. Endoh;T. Morozumi;Zhaohua Xiong
在轻子生成的假设中，重马约拉纳中微子的衰变产生轻子族的不对称性，Ye，Y μ和Yτ。这些不对称性对跷跷板模型中的CP破坏相很敏感。通过求解玻尔兹曼方程，导出了轻子族不对称性的时间演化。考虑一个最小的跷跷板模型，我们显示了如何每个家庭的不对称性变化与一个特定的CP违反阶段。例如，我们发现轻子不对称性由Yμ或Yτ主导的情况，取决于CP破坏相的选择。我们还发现轻子族不对称性Yμ和Yτ的符号相反的情况。它们的绝对值可以大于轻子不对称性的总和，而重子不对称性可能是轻子族不对称性抵消的结果。
In the leptogenesis scenario, decays of heavy Majorana neutrinos generate lepton family asymmetries, Ye ,Y µ and Yτ. These asymmetries are sensitive to CP violating phases in seesaw models. The time evolution of the lepton family asymmetries is derived by solving Boltzmann equations. Considering a minimal seesaw model, we show how each family asymmetry varies with one particular CP violating phase. For instance, we find the case in which the lepton asymmetry is dominated by Yµ or Yτ, depending on the choice of the CP violating phase. We also find the case in which the signs of the lepton family asymmetries Yµ and Yτ are opposite. Their absolute values can be larger than the total lepton asymmetry, and baryon asymmetry may result from the cancellation of the lepton family asymmetries.