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arXiv 2209.03031hep-ph
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轻无菌中微子、左右对称性和$0νββ$衰变

Light Sterile Neutrinos, Left-Right Symmetry, and $0νββ$ Decay

Jordy de Vries, Gang Li, Michael J. Ramsey-Musolf, Juan Carlos Vasquez

摘要:

研究了在相对轻的右手中微子存在下,最小左右对称模型中的无中微子双β($0νββ$)衰变率。利用有效场论方法,我们系统地考虑了模型中的所有贡献以及衰变振幅对右手中微子质量的依赖关系。在I型和II型跷跷板的情况下,我们分析了右手中微子的影响重约10兆电子伏,表明这种效果可以导致检测到$0νββ$衰变在下一代实验中,即使是正常的层次结构和相对较大的右手尺度设置的质量假设右手规范玻色子。最后,我们评论轻右手中微子和强CP问题之间的可能联系。

英文摘要:

We investigate neutrinoless double beta ($0νββ$) decay rates in minimal left-right symmetric models in presence of relatively light right-handed neutrinos. By use of an effective field theory approach, we systematically include all contributions in the model as well as the dependence of the decay amplitude on the masses of right-handed neutrinos. In type-I and type-II seesaw scenarios, we analyze the impact of right-handed neutrinos heavier than about 10 MeV, showing that this effect can lead to a detection of $0νββ$ decay in the next-generation experiments even for the normal hierarchy and a relatively large right-handed scale set by the mass of hypothetical right-handed gauge bosons. Finally, we comment on a possible connection between light right-handed neutrinos and the strong CP problem.

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