Datta Arghyajit, Roshan Rishav, Sil Arunansu
Department of Physics, Indian Institute of Technology Guwahati, Assam-781039, India.
Phys Rev Lett. 2021 Dec 3;127(23):231801. doi: 10.1103/PhysRevLett.127.231801.
We show that the type-I seesaw, responsible for generating the light neutrino mass, itself is capable of accommodating one of the three right handed neutrinos as a freeze-in type of dark matter where the required smallness of the associated coupling is connected to the lightness of the (smallest) active neutrino mass. It turns out that (a) the nonthermal production of dark matter having mass ≲O(1) MeV (via decays of W, Z bosons and standard model Higgs) consistent with relic density and (b) its stability determine this smallest active neutrino mass uniquely ∼O(10^{-12}) eV. On the other hand, the study of flavor leptogenesis in this scenario (taking into account the latest neutrino data and Higgs vacuum stability issue) fixes the scale of two other right handed neutrinos.
我们表明，负责产生轻中微子质量的I型跷跷板机制本身能够容纳三个右手型中微子之一作为冻结型暗物质，其中相关耦合所需的微小性与（最小的）活性中微子质量的微小性相关。结果表明，（a）质量≲O(1) MeV的暗物质的非热产生（通过W、Z玻色子和标准模型希格斯玻色子的衰变）与遗迹密度一致，以及（b）其稳定性唯一地确定了这个最小的活性中微子质量约为O(10⁻¹²) eV。另一方面，在这种情况下对味轻子生成的研究（考虑到最新的中微子数据和希格斯真空稳定性问题）确定了另外两个右手型中微子的尺度。
