Explaining DAMPE results by dark matter with hierarchical lepton-specific Yukawa interactions

Guoli Liu; Fei Wang; Wenyu Wang; Jin-Min Yang

doi:10.1088/1674-1137/42/3/035101

Chinese Physics C> 2018, Vol. 42> Issue(3) : 035101 DOI: 10.1088/1674-1137/42/3/035101

Explaining DAMPE results by dark matter with hierarchical lepton-specific Yukawa interactions

Guoli Liu ^1,2 ,
Fei Wang ^1,2,, ,
Wenyu Wang ³ ,
Jin-Min Yang ^2,4,5

1.
School of Physics, Zhengzhou University, Zhengzhou 450000, China
2.
CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China
3.
College of Applied Science, Beijing University of Technology, Beijing 100124, China
4.
CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China
5.
School of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
6.
Department of Physics, Tohoku University, Sendai 980-8578, Japan

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Abstract：
We propose to interpret the DAMPE electron excess at 1.5 TeV through scalar or Dirac fermion dark matter (DM) annihilation with doubly charged scalar mediators that have lepton-specific Yukawa couplings. The hierarchy of such lepton-specific Yukawa couplings is generated through the Froggatt-Nielsen mechanism, so that the dark matter annihilation products can be dominantly electrons. Stringent constraints from LEP2 on intermediate vector boson production can be evaded in our scenarios. In the case of scalar DM, we discuss one scenario with DM annihilating directly to leptons and another scenario with DM annihilating to scalar mediators followed by their decays. We also discuss the Breit-Wigner resonant enhancement and the Sommerfeld enhancement in the case where the s-wave annihilation process is small or helicity-suppressed. With both types of enhancement, constraints on the parameters can be relaxed and new ways for model building can be opened in explaining the DAMPE results.
- DAMPE ,
- dark matter ,
- Froggatt-Nielsen mechanism ,
- Sommerfeld enhancement

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Guoli Liu, Fei Wang, Wenyu Wang and Jin-Min Yang. Explaining DAMPE results by dark matter with hierarchical lepton-specific Yukawa interactions[J]. Chinese Physics C, 2018, 42(3): 035101. doi: 10.1088/1674-1137/42/3/035101

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Received: 2017-12-15

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Supported by National Natural Science Foundation of China (11105124, 11105125, 11375001, 11675147, 11675242), the Open Project Program of State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences (Y5KF121CJ1), the Innovation Talent project of Henan Province (15HASTIT017), the Young-Talent Foundation of Zhengzhou University, the CAS Center for Excellence in Particle Physics (CCEPP), the CAS Key Research Program of Frontier Sciences and a Key RD Program of Ministry of Science and Technology of China (2017YFA0402200-04)

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沈阳化工大学材料科学与工程学院沈阳 110142

Explaining DAMPE results by dark matter with hierarchical lepton-specific Yukawa interactions

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Explaining DAMPE results by dark matter with hierarchical lepton-specific Yukawa interactions

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