论文标题
无菌中微子在$μν$ SSM和暗物质中的现象学含义
Phenomenological implications of sterile neutrinos in the $μν$SSM and dark matter
论文作者
论文摘要
我们分析了无菌中微子在$μν$ SSM框架中的作用，在$μν$ SSM的框架中，右手中微子的存在为$μ$ - 和$ν$ - 超对称性的问题提供了同时解决方案。我们采用一种简约的方法，重现光中微子的质量，并在树层上使用两个右手中微子作为SEESAW机制的一部分混合角度。第三个右中微子对三个活跃的中微子的质量没有显着贡献，表现为无菌中微子，质量为kev $ -Mev。此外，大约$ 10 $ kev的无菌中微子可能是暗物质的良好候选者，其终生大于宇宙时代。特别是，三体衰变对活性中微子造成了对其寿命的主要贡献。对伽马和活性中微子的一环衰减是亚域的，但与天体物理X射线等观测值有关。我们发现$μν$ SSM的参数空间的区域，具有不同的无菌中微子质量值，不仅满足了这些约束，而且还满足了来自Higgs扇区的对撞机的约束。
We analyze the role of sterile neutrinos in the framework of the $μν$SSM, where the presence of right-handed neutrinos provides a simultaneous solution to $μ$- and $ν$-problems in supersymmetry. We adopt a minimalistic approach, reproducing light neutrino masses and mixing angles at tree level using just two right-handed neutrinos as part of the seesaw mechanism. A third right-handed neutrino does not contribute significantly to the mass of the three active ones, behaving as a sterile neutrino with a mass in the range keV$-$MeV. Furthermore, a sterile neutrino of about $10$ keV can be a good candidate for dark matter with a lifetime larger than the age of the Universe. In particular, the three-body decay to active neutrinos gives the dominant contribution to its lifetime. The one-loop decay to gamma and active neutrino is subdominant, but relevant for observations such as astrophysical X-rays. We find regions of the parameter space of the $μν$SSM, with different values of the sterile neutrino mass, fulfilling not only these constraints but also collider constraints from the Higgs sector.
