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arXiv 1104.2465hep-ph
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第四代马约拉纳中微子

Fourth Generation Majorana Neutrinos

Alexander Lenz, Heinrich Päs, Dario Schalla

摘要:

我们研究了轻子扇区中第四个连续产生的可能性。假设中微子是Majorana粒子,从最近的一个证据开始-虽然很弱-第四代中微子从适合弱轻子和介子衰变的非零混合物,我们讨论了无中微子双β衰变,辐射轻子衰变和在强子对撞机上产生的类似符号的双轻子的约束。最后简要介绍了建立第四代中微子质量模型的设想。在这里,我们软化的大层次的中微子质量在一个额外的维模型,将每一代不同的轻子数违反膜没有大的层次。

英文摘要:

We investigate the possibility of a fourth sequential generation in the lepton sector. Assuming neutrinos to be Majorana particles and starting from a recent - albeit weak - evidence for a non-zero admixture of a fourth generation neutrino from fits to weak lepton and meson decays we discuss constraints from neutrinoless double beta decay, radiative lepton decay and like-sign dilepton production at hadron colliders. Also an idea for fourth generation neutrino mass model building is briefly outlined. Here we soften the large hierarchy of the neutrino masses within an extradimensional model that locates each generation on different lepton number violating branes without large hierarchies.

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