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X-ray Line from the Dark Transition Electric Dipole · Around

2014

X-ray Line from the Dark Transition Electric Dipole

Geng, Chao-Qiang, Huang, Da, Tsai, Lu-Hsing

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We study a two-component dark matter (DM) model in which the two Majorana fermionic DM components with nearly degenerate masses are stabilized by an $Z_2$ symmetry and interact with the right-handed muon and tau only via real Yukawa couplings, together with an additional $Z_2$-odd singly-charged scalar.

In this setup, the decay from the heavy DM to the lighter one via the transition electric dipole yields the 3.55 keV X-ray signal observed recently.
The Yukawa couplings in the dark sector are assumed to be hierarchical, so that the observed DM relic abundance can be achieved with the leading s-wave amplitudes without a fine-tuning.
We also consider the constraints from flavor physics, DM direct detections and collider searches, respectively.

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