论文标题
中微子和$ z'$现象学中的无异常$ \ mathbf {u}（1）$扩展：高维操作员的作用
Neutrino and $Z'$ phenomenology in an anomaly-free $\mathbf{U}(1)$ extension: role of higher-dimensional operators
论文作者
论文摘要
我们考虑一个无异常的$ \ mathrm {u}（1）$带有三个右中微子（RHNS）和两个复杂标量的标准模型扩展，其中充电分配排除了中微子的所有树级质量项。考虑到这种设置反过来只是一种低能的有效理论，我们介绍了较高的术语{\ em a la} froggatt-nielsen自然会产生微小的中微子质量。事实证明，其中一个RHN非常轻，因此构成了$ z'$的主要衰减模式，因此放松了LHC Dilepton Resonance搜索约束。这个非常有生命的终生能与宇宙的年龄相比或更大，因此，可以解释暗物质的不可忽略的部分。
We consider an anomaly-free $\mathrm{U}(1)$ extension of the Standard Model with three right-handed neutrinos (RHNs) and two complex scalars, wherein the charge assignments preclude all tree-level mass terms for the neutrinos. Considering this setup, in turn, to be only a low-energy effective theory, we introduce higher-dimensional terms {\em a la} Froggatt-Nielsen to naturally generate tiny neutrino masses. One of the RHNs turns out to be very light, thereby constituting the main decay mode for the $Z'$ and hence relaxing the LHC dilepton resonance search constraints. This very RHN has a lifetime comparable to or bigger than the age of the Universe, and, hence, could account for a non-negligible fraction of the dark matter.
