Baryogenesis from L -violating Higgs-doublet decay in the density-matrix formalism
Baryogenesis from L -violating Higgs-doublet decay in the density-matrix formalism
复制标题
DOI：
10.1103/physrevd.96.015031
复制
发表时间：
2017-04
影响因子：
5
通讯作者：
T. Hambye;D. Teresi
中科院分区：
文献类型：
--
作者：
T. Hambye;D. Teresi
我们在密度矩阵形式中计算希格斯双峰衰变为右手（RH）中微子和标准模型轻子所产生的重子不对称性。重点放在总轻子数不守恒衰变所产生的重子不对称性上。从相应的演化方程的推导及其积分中，我们发现这种贡献与参数空间的大部分完全相关。这证实了最近在带有热修正的CP破坏衰变形式中发现的结果，并特别表明轻子数破坏过程不仅对于高尺度轻子生成很重要，而且当RH中微子质量在GeV范围内时也很重要。对于汤川耦合的大值，我们还发现，总轻子数违规部分的强冲刷通常比通常的 RH 中微子振荡风味部分温和得多。
We compute in the density-matrix formalism the baryon asymmetry generated by the decay of the Higgs doublet into a right-handed (RH) neutrino and a Standard Model lepton. The emphasis is put on the baryon asymmetry produced by the total lepton-number violating decay. From the derivation of the corresponding evolution equations, and from their integration, we find that this contribution is fully relevant for large parts of the parameter space. This confirms the results found recently in the CP-violating decay formalism with thermal corrections and shows in particular that the lepton-number violating processes are important not only for high-scale leptogenesis but also when the RH-neutrino masses are in the GeV range. For large values of the Yukawa couplings, we also find that the strong washout is generically much milder for this total lepton-number violating part than for the usual RH-neutrino oscillation flavour part.