Abstract
The Atomiki anomaly can be interpreted as a new light vector boson. If such a new particle exists, it could be a mediator between the Standard Model sector and the dark sector including the dark matter. We discussed some simple effective models with these particles. In the models, the secluded dark matter models are good candidates to satisfy the thermal relic abundance. In particular, we found that the dark matter self-interaction can be large enough to solve the small scale structure puzzles if the dark matter is a fermion.
Highlights
A nuclear experiment in Hungary has reported the observation of a new resonance in the decay of excited 8Be nuclei [1]
The vector boson is referred as the protophobic light vector boson
In the rest of this article, we discuss the models of the real scalar and the Majorana fermion dark matter
Summary
A nuclear experiment in Hungary has reported the observation of a new resonance in the decay of excited 8Be nuclei [1]. The resonance can be interpreted as a new weakly interacting light particle of 16.7 MeV. In the rest of this article, we discuss the models of the real scalar and the Majorana fermion dark matter. Since they are neutral under the new gauge symmetry U(1)X, the models require other particles which mediate the interaction between the dark matter and X. They can be compatible with the thermal relic scenario. The given models are implemented in the explicit models of the protophobic light vector and other models since the dark matter properties are mostly determined in the dark sector
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