Magnetic dark matter for the X-ray line at 3.55 keV

  title={Magnetic dark matter for the X-ray line at 3.55 keV},
  author={H. M. Lee},
  journal={Physics Letters B},
  • H. M. Lee
  • Published 2014
  • Physics
  • Physics Letters B
Abstract We consider a decaying magnetic dark matter explaining the X-ray line at 3.55 keV shown recently from XMM-Newton observations. We introduce two singlet Majorana fermions that have almost degenerate masses and fermion–portal couplings with a charged scalar of weak scale mass. In our model, an approximate Z 2 symmetry gives rise to a tiny transition magnetic moment between the Majorana fermions at one loop. The heavier Majorana fermion becomes a thermal dark matter due to the sizable… Expand
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