期刊
PHYSICAL REVIEW D
卷 92, 期 11, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.92.115002
关键词
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资金
- Max Planck Society [MANITOP]
We analyze a simple extension of the standard model where the dark matter particle is a Dirac fermion that is a mixture of a singlet and an SU(2) doublet. The model contains only four free parameters: the singlet and the doublet masses and two new Yukawa couplings. Direct detection bounds in this model are very strong and require the dark matter particle to be singletlike. As a result, its relic density has to be obtained via coannihilations with the doublet. We find that the dark matter mass should be below 750 GeV, the singlet-doublet mass difference cannot exceed 9%, and direct detection experiments offer the best chance to probe this scenario. Finally, we also show that this model can effectively arise in well-motivated extensions of the standard model.
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