论文标题
在最小的Seesaw机构中隐藏中微子双β衰减
Hiding neutrinoless double beta decay in the minimal seesaw mechanism
论文作者
论文摘要
我们提出了一种可能性，即中微子双β衰减可以隐藏在最小的Seesaw机制中，其中标准模型由两个具有层次结构的右手中微子扩展。在此框架中，由于大型主要中微子，Lepton数字被违反。尤其是，我们调查了较重的右中微子足够重，可以使衰变脱发，而较轻的中微子比典型的核核量表较轻，而较轻的核中微子则足够轻，并且对衰减产生了可观的贡献。在混合元件的特定条件下，较轻的右手中微子可以产生明显的破坏性贡献，从而抑制甚至隐藏了中微子双β衰变的有效质量。在这种情况下，预测较轻的右中微子与普通中微子的混合元件的风味结构取决于违反活性中微子的主要CP阶段。
We present a possibility that the neutrinoless double beta decay can be hidden in the minimal seesaw mechanism where the standard model is extended by two right-handed neutrinos which have a hierarchical mass structure. In this framework, the lepton number is violated due to the massive Majorana neutrinos. Especially, we investigate the case that the heavier right-handed neutrino is sufficiently heavy to decouple from the decay while the lighter one is lighter enough than the typical Fermi-momentum scale of nuclei and gives a sizable contribution to the decay. Under the specific condition on mixing elements, the lighter right-handed neutrino can give a significant destructive contribution which suppresses or even hides to the effective mass of the neutrinoless double beta decay. In this case, the flavor structure of the mixing element of the lighter right-handed neutrino with ordinary neutrinos is predicted depending on the Majorana CP violating phase of active neutrinos.
