A fuller flavour treatment of N 2 -dominated leptogenesis
A fuller flavour treatment of N 2 -dominated leptogenesis
复制标题
N 2 主导的轻体发生的更全面风味处理
DOI：
10.1016/j.nuclphysb.2011.10.036
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发表时间：
2012
影响因子：
2.8
通讯作者：
Antusch S
中科院分区：
文献类型：
--
作者：
Antusch S
我们讨论了在迄今为止被忽略的风味依赖性效应存在的情况下，N2 主导的轻子发生，特别是风味耦合矩阵的非对角线条目，该矩阵将分布在不同粒子种类中的总风味不对称性与轻子和希格斯双峰不对称性连接起来。我们推导出最终不对称性的分析公式，包括 N2 衰变阶段以及最轻的右手中微子 N1 冲刷阶段的味道耦合。此外，我们指出，一般来说，部分电子和μ子不对称性（幻影项）可以完全逃脱生产时的冲刷，并且可以通过最轻的RH中微子冲刷产生总的B−L不对称性，从而产生所谓的幻影轻子发生。然而，幻象项与初始 N2 丰度成正比，特别是当初始 N2 丰度为零时，它们消失。考虑到这些新效应中的任何一个，都可以显着改变由次轻的 RH 中微子衰变产生的最终不对称性，为 N2 主导的热轻子发生开辟新的有趣的可能性。
We discuss N2-dominated leptogenesis in the presence of flavour dependent effects that have hitherto been neglected, in particular the off-diagonal entries of the flavour coupling matrix that connects the total flavour asymmetries, distributed in different particle species, to the lepton and Higgs doublet asymmetries. We derive analytical formulae for the final asymmetry including the flavour coupling at the N2-decay stage as well as at the stage of wash-out by the lightest right-handed neutrino N1. Moreover, we point out that in general part of the electron and muon asymmetries (phantom terms), can completely escape the wash-out at the production and a total B−L asymmetry can be generated by the lightest RH neutrino wash-out yielding so-called phantom leptogenesis. However, the phantom terms are proportional to the initial N2abundance and in particular they vanish for initial zero N2-abundance. Taking any of these new effects into account can significantly modify the final asymmetry produced by the decays of the next-to-lightest RH neutrinos, opening up new interesting possibilities for N2-dominated thermal leptogenesis.