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

作　　者：柳国丽 王飞 王雯宇 杨金民 

机构地区：[1]School of Physics,Zhengzhou University [2]CAS Key Laboratory of Theoretical Physics,Institute of Theoretical Physics,Chinese Academy of Sciences [3]College of Applied Science,Beijing University of Technology [4]School of Physics,University of Chinese Academy of Sciences [5]Department of Physics,Tohoku University

出　　处：《Chinese Physics C》2018年第3期87-93,共7页中国物理C（英文版）

基　　金：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 R&D Program of Ministry of Science and Technology of China(2017YFA0402200-04)

摘　　要：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.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.

关 键 词：DAMPE dark matter Froggatt-Nielsen mechanism Sommerfeld enhancement 

分 类 号：O572.2[理学—粒子物理与原子核物理]