3.5 keV galactic emission line as a signal from the hidden sector

doi:10.1103/PhysRevD.90.035009

	3.5 keV galactic emission line as a signal from the hidden sector
	Chen, Ning 1,2; Liu, Zuowei 1,2,3; Nath, Pran 4
刊名	PHYSICAL REVIEW D
	2014-08-12
卷号	90
ISSN号	1550-7998
DOI	10.1103/PhysRevD.90.035009
文献子类	Article
英文摘要	An emission line with energy of E similar to 3.5 keV has been observed in galaxy clusters by two experiments. The emission line is consistent with the decay of a dark matter particle with a mass of similar to 7 keV. In this work we discuss the possibility that the dark particle responsible for the emission is a real scalar (rho) which arises naturally in a U(1)(X) Stueckelberg extension of minimal supersymmetric standard model (MSSM). In the MSSM Stueckelberg extension rho couples only to other scalars carrying a U(1)(X) quantum number. Under the assumption that there exists a vectorlike leptonic generation carrying both SU(2)(L) x U(1)(Y) and U(1)(X) quantum numbers, we compute the decay of the rho into two photons via a triangle loop involving scalars. The relic density of the. arises via the decay H-0 -> h(0) + rho at the loop level involving scalars, and via the annihilation processes of the vectorlike scalars into rho + h(0). It is shown that the galactic data can be explained within a multicomponent dark matter model where the 7 keV dark matter is a subdominant component constituting only 1%-10% of the matter relic density, with the rest being supersymmetric dark matter such as the neutralino. Thus, the direct detection experiments remain viable searches for weakly interacting massive particles. The fact that the dark scalar. with no interactions with the standard model particles arises from a Stueckelberg extension of a hidden U(1)(X) implies that the 3.5 keV galactic line emission is a signal from the hidden sector.
WOS关键词	DARK-MATTER ; STUECKELBERG EXTENSION ; BOSONS ; MODELS
语种	英语
出版者	AMER PHYSICAL SOC
WOS记录号	WOS:000341242400003
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/49495]
专题	中国科学院近代物理研究所
通讯作者	Chen, Ning
作者单位	1.Tsinghua Univ, Inst Modern Phys, Beijing 100084, Peoples R China 2.Tsinghua Univ, Ctr High Energy Phys, Beijing 100084, Peoples R China 3.McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada 4.Northeastern Univ, Dept Phys, Boston, MA 02115 USA
推荐引用方式 GB/T 7714	Chen, Ning,Liu, Zuowei,Nath, Pran. 3.5 keV galactic emission line as a signal from the hidden sector[J]. PHYSICAL REVIEW D,2014,90.
APA	Chen, Ning,Liu, Zuowei,&Nath, Pran.(2014).3.5 keV galactic emission line as a signal from the hidden sector.PHYSICAL REVIEW D,90.
MLA	Chen, Ning,et al."3.5 keV galactic emission line as a signal from the hidden sector".PHYSICAL REVIEW D 90(2014).