Generating X-ray lines from annihilating dark matter

@article{Dudas2014GeneratingXL,
  title={Generating X-ray lines from annihilating dark matter},
  author={E. Dudas and Lucien Heurtier and Y. Mambrini},
  journal={Physical Review D},
  year={2014},
  volume={90},
  pages={035002}
}
We propose different scenarios where a keV dark matter annihilates to produce a monochromatic signal. The process is generated through the exchange of a light scalar of mass of order 300 keV - 50 MeV coupling to photon through loops or higher dimensional operators. For natural values of the couplings and scales, the model can generate a gamma-ray line which can fit with the recently identified 3.5 keV X-ray line. 
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X-Ray Lines from Dark Matter Annihilation at the keV Scale.
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3.55 keV line in minimal decaying dark matter scenarios
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X-ray lines and self-interacting dark matter
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