https://doi.org/10.1140/epjc/s10052-023-11609-5
Regular Article - Theoretical Physics
Sterile neutrino portal dark matter in 
THDM
1
School of Physics and Physical Engineering, Qufu Normal University, 273165, Qufu, Shandong, China
2
School of Physics and Technology, University of Jinan, 250022, Jinan, Shandong, China
Received:
9
January
2023
Accepted:
10
May
2023
Published online:
22
May
2023
In this paper, we propose the sterile neutrino portal dark matter in THDM. This model can naturally generate tiny neutrino mass with the neutrinophilic scalar doublet 
and sterile neutrinos N around TeV scale. Charged under a 
symmetry, one Dirac fermion singlet 
and one scalar singlet 
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 NLOP is also important. When sterile neutrinos are heavier than the dark sector, NLOP 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.
© The Author(s) 2023
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