Hiding neutrinoless double beta decay in the minimal seesaw mechanism
Hiding neutrinoless double beta decay in the minimal seesaw mechanism
复制标题
在最小跷跷板机制中隐藏无中微子双β衰变
DOI：
10.1103/physrevd.103.015014
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发表时间：
2021
影响因子：
5
通讯作者：
Tanaka Kazuki
中科院分区：
文献类型：
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作者：
Asaka Takehiko;Ishida Hiroyuki;Tanaka Kazuki
我们提出了一种可能性，中微子双β衰变可以隐藏在最小的跷跷板机制，其中标准模型是由两个右手中微子，具有分级质量结构的扩展。在这个框架中，轻子数是违反由于大量马约拉纳中微子。特别是，我们调查的情况下，较重的右手中微子是足够重的衰变解耦，而较轻的是轻到足以比典型的费米动量尺度的核，并给出了相当大的贡献衰变。在特定的混合元条件下，较轻的右手中微子对无中微子双β衰变的有效质量有显著的破坏性贡献，抑制甚至掩盖了双β衰变的有效质量。在这种情况下，较轻的右手中微子与普通中微子的混合元素的味道结构的预测取决于活跃中微子的Majorana破坏相。
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 Majoranaviolating phase of active neutrinos.