论文标题
CP违反在混合和振荡与准脱位中微子的诱导和振荡中
CP violation in mixing and oscillations for leptogenesis with quasi-degenerate neutrinos
论文作者
论文摘要
我们研究了具有准脱位中微子的男性生成模型的CP违规来源。我们的方法是在中微子振荡的量子场理论模型中使用重新归一化的繁殖器，并密切关注单位性要求。从以这种方式获得的Lepton数字违反过程的概率，我们得出了Lepton不对称时间演变的源项。源术语的贡献可以通过违反CP的混合，振荡和两者之间的干扰来识别。鉴于此源项在初始或最终状态中不涉及具有不稳定粒子的过程，因此它也不需要计算中微子的数量密度，因此不得执行实际中间状态的减法。在平衡中，由于单位性和CPT不变性的要求，源项为无效，这是由于在混合和振荡中违反CP的术语之间取消了。计算是在简单的标量玩具模型中完成的，并且在质量差的衰减宽度中，重新召集的传播器在一阶中对对角线进行对角线。我们还对干扰术语的效果发表评论，这在我们工作的顺序上很温和，但随着堕落的增加似乎变得越来越重要。
We study the sources of CP violation for baryogenesis models with quasi-degenerate neutrinos. Our approach is to use the renormalized propagator in a quantum field theory model of neutrino oscillations, paying close attention to unitarity requirements. From the probabilities of lepton number violating processes obtained in this way, we derive a source term for the time evolution of the lepton asymmetry. The source term has contributions that can be identified with CP violation from mixing, oscillations and interference between both. Given that this source term does not involve processes with unstable particles in the initial or final states, neither does it require to calculate number densities of neutrinos, no subtraction of real intermediate states must be performed. In equilibrium the source term is null, as demanded by unitarity and CPT invariance, due to a cancellation between the terms coming from CP violation in mixing and oscillations. The calculations are done in a simple scalar toy model, and the resummed propagator is diagonalized at first order in the decay widths over the mass difference. We also comment on the effect of the interference term, which is mild at the order we work, but seems to become more important with increasing degeneracy.
