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题名: Sommerfeld enhancements with vector, scalar, and pseudoscalar force carriers
作者: Liu, ZP ;  Wu, YL ;  Zhou, YF
刊名: PHYSICAL REVIEW D
出版日期: 2013
卷号: 88, 期号:9, 页码:96008
关键词: DARK-MATTER ;  ELECTRONS ;  ENERGIES
学科分类: Physics
通讯作者: Liu, ZP (reprint author), Chinese Acad Sci, Inst Theoret Phys, Kavli Inst Theoret Phys China, State Key Lab Theoret Phys, Beijing 100190, Peoples R China.
部门归属: [Liu, Ze-Peng; Wu, Yue-Liang; Zhou, Yu-Feng] Chinese Acad Sci, Inst Theoret Phys, Kavli Inst Theoret Phys China, State Key Lab Theoret Phys, Beijing 100190, Peoples R China; [Wu, Yue-Liang] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
英文摘要: The first AMS-02 measurement confirms the existence of an excess in the cosmic-ray positron fraction previously reported by the PAMELA and Fermi-LAT experiments. If interpreted in terms of thermal dark matter (DM) annihilation, the AMS-02 result still suggests that the DM annihilation cross section in the present day should be significantly larger than that at freeze-out. The Sommerfeld enhancement of the DM annihilation cross section is a possible explanation, which is however subject to the constraints from DM thermal relic density, mainly due to the annihilation of DM particles into force-carrier particles introduced by the mechanism. We show that the effects of the Sommerfeld enhancement and the relic density constraints depend significantly on the nature of the force carrier. Three scenarios where the force carrier is a vector boson, scalar, and pseudoscalar particle are investigated and compared. The results show that for the case with a vector force carrier, the Sommerfeld enhancement can marginally account for the AMS-02 data for the DM particle annihilating into 2 mu final states, while for the scalar force carrier the allowed Sommerfeld enhancement factor can be larger by a factor of 2. For the case with a pseudoscalar force carrier, the Sommerfeld enhancement factor can be very large in the resonance region, and it is possible to accommodate the AMS-02 and Fermi-LAT result for a variety of DM annihilation final states.
资助者: National Basic Research Program of China (973 Program) [2010CB833000]; National Nature Science Foundation of China (NSFC) [10975170, 10821504, 10905084]; Chinese Academy of Science
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000327209200008
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/15232
Appears in Collections:理论物理所2013年知识产出 _期刊论文

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Recommended Citation:
Liu, ZP,Wu, YL,Zhou, YF. Sommerfeld enhancements with vector, scalar, and pseudoscalar force carriers[J]. PHYSICAL REVIEW D,2013,88(9):96008.
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