论文标题
无菌中微子门户暗物质$ν$ thdm
Sterile Neutrino Portal Dark Matter in $ν$THDM
论文作者
论文摘要
在本文中，我们提出了$ν$ thdm的无菌中微子门户暗物质。该模型可以自然地产生中微子质量，而中性粒子标量双线$φ_ν$和TEV量表周围的无菌中微子$ n $。在Dark Sector中进一步引入了以$ z_2 $对称的对称，一个Dirac Fermion Singlet $χ$和一个标量曲目$ ϕ $。无菌中微子$ n $是DM和SM之间的介体。根据耦合强度，DM可以是w imp或fimp。对于WIMP场景，将DM歼灭成$ NN $是满足各种界限的关键渠道，可以在间接检测实验中对其进行测试。对于FIMP场景，除了冻结机制直接生产DM外，NLSP后期衰减的贡献也很重要。当无菌中微子比黑暗区域重时，由于无菌和轻中微子之间的小混合角，NLSP长期存在。考虑了自由流长度，CMB，BBN和中微子实验的约束。
In this paper, we propose the sterile neutrino portal dark matter in $ν$THDM. This model can naturally generate tiny neutrino mass with the neutrinophilic scalar doublet $Φ_ν$ and sterile neutrinos $N$ around TeV scale. Charged under a $Z_2$ symmetry, one Dirac fermion singlet $χ$ and one scalar singlet $ϕ$ are further introduced in the dark sector. The sterile neutrinos $N$ are the mediators between the DM and SM. Depending on the coupling strength, the DM can be either WIMP or FIMP. For the WIMP scenario, pair annihilation of DM into $NN$ is the key channel to satisfy various bounds, which could be tested at indirect detection experiments. For the FIMP scenario, besides the direct production of DM from freeze-in mechanism, contributions from late decay of NLSP is also important. When sterile neutrinos are heavier than the dark sector, NLSP is long-lived due to tiny mixing angle between sterile and light neutrinos. Constrains from free-streaming length, CMB, BBN and neutrino experiments are considered.
