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arXiv 1104.4068hep-ph
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新一代的中微子质量

Neutrino masses from new generations

Alberto Aparici, Juan Herrero-García, Nuria Rius, Arcadi Santamaria

摘要:

我们重新考虑的可能性,马约拉纳质量的三个已知的中微子辐射产生的第四代和一个右手中微子与汤川耦合和马约拉纳质量项。我们发现,所观察到的轻中微子的质量等级是不兼容的低能量的普适性界限在这个最小的情况下,但所有目前的数据可以容纳与五代和两个右手中微子。在这个框架内,我们探讨了目前允许的参数空间区域,并可能导致可观察到的影响,在中微子双β衰变,$μ- e$转换的核和$μ\rightarrow e γ$实验。我们还讨论了在LHC上的探测前景。

英文摘要:

We reconsider the possibility that Majorana masses for the three known neutrinos are generated radiatively by the presence of a fourth generation and one right-handed neutrino with Yukawa couplings and a Majorana mass term. We find that the observed light neutrino mass hierarchy is not compatible with low energy universality bounds in this minimal scenario, but all present data can be accommodated with five generations and two right-handed neutrinos. Within this framework, we explore the parameter space regions which are currently allowed and could lead to observable effects in neutrinoless double beta decay, $μ- e$ conversion in nuclei and $μ\rightarrow e γ$ experiments. We also discuss the detection prospects at LHC.

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