X-ray Line from the Dark Transition Electric Dipole

TL;DR

This paper proposes a two-component Majorana fermion dark matter model with a transition electric dipole moment that explains the 3.55 keV X-ray line, while satisfying relic abundance and experimental constraints.

Contribution

It introduces a novel dark matter model with hierarchical Yukawa couplings that accounts for the X-ray line and complies with various experimental bounds.

Findings

The model explains the 3.55 keV X-ray line via dark matter decay.

Relic abundance is achieved without fine-tuning due to hierarchical Yukawa couplings.

Constraints from flavor physics, direct detection, and collider searches are satisfied.

Abstract

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.