X-ray line from the dark transition electric dipole

被引：22

作者：

Geng, Chao-Qiang ^{[1
]}

Huang, Da

Tsai, Lu-Hsing

机构：

[1] Chongqing Univ Posts & Telecommun, Chongqing 400065, Peoples R China

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2014年 / 08期

关键词：

Beyond Standard Model; Cosmology of Theories beyond the SM; MATTER; SIGNAL;

D O I：

10.1007/JHEP08(2014)086

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

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-ay 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.

引用

页数：16

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