CP violation in scatterings, three body processes and the Boltzmann equations for leptogenesis
CP violation in scatterings, three body processes and the Boltzmann equations for leptogenesis
复制标题
散射中的 CP 破坏、三体过程和轻子发生的玻尔兹曼方程
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
E. Roulet
中科院分区：
文献类型：
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作者：
E. Nardi;J. Racker;E. Roulet
我们得到的玻尔兹曼方程的leptogenesis包括衰变和散射过程的两个和三个体的初始或最终状态。我们给出了违反散射不对称性的CP的显式计算。我们分析了它们在leptogenesis中可能产生的影响，并讨论了它们在衰变不对称性方面的近似表达式的有效性。在初始重中微子密度消失的情况下，在散射中包含CP不对称性可以强制抵消早期产生的轻子不对称性和后期产生的不对称性。我们认为，大量的冲刷是至关重要的破坏这种取消，我们表明，在政权中的冲刷是特别弱，包括CP违反散射产生减少轻子不对称的最终值。在强冲刷机制中，散射中包含CP破坏仍然导致高温下轻子不对称性的显著增强;然而，由于这些机制的特征与早期条件无关，轻子不对称性的最终值保持大致不变。
We obtain the Boltzmann equations for leptogenesis including decay and scattering processes with two and three body initial or final states. We present an explicit computation of the CP violating scattering asymmetries. We analyze their possible impact in leptogenesis, and we discuss the validity of their approximate expressions in terms of the decay asymmetry. In scenarios in which the initial heavy neutrino density vanishes, the inclusion of CP asymmetries in scatterings can enforce a cancellation between the lepton asymmetry generated at early times and the asymmetry produced at later times. We argue that a sizeable amount of washout is crucial for spoiling this cancellation, and we show that in the regimes in which the washouts are particularly weak, the inclusion of CP violation in scatterings yields a reduction in the final value of the lepton asymmetry. In the strong washout regimes the inclusion of CP violation in scatterings still leads to a significant enhancement of the lepton asymmetry at high temperatures; however, due to the independence from the early conditions that is characteristic of these regimes, the final value of the lepton asymmetry remains approximately unchanged.