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

2014

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

Lee, Hyun Min

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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 fermion-portal coupling to the SM charged fermions.

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