Journal
PHYSICAL REVIEW D
Volume 90, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.90.035002
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Funding
- French ANR TAPDMS [ANR-09-JCJC0146]
- Spanish MICINN's Consolider-Ingenio Programme [CSD2009-00064]
- European Union FP7 ITN INVISIBLES (Marie Curie Actions) [PITN- GA-2011- 289442]
- ERC advanced Grants MassTeV and Higgs@LHC
- Alexander von Humboldt foundation
- DESY-Hamburg
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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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