Journal of High Energy Physics

, 2019:141 | Cite as

Light dark matter showering under broken dark U(1) — revisited

  • Junmou ChenEmail author
  • Pyungwon Ko
  • Hsiang-nan Li
  • Jinmian Li
  • Hiroshi Yokoya
Open Access
Regular Article - Theoretical Physics


It was proposed recently that different chiralities of the dark matter (DM) fermion under a broken dark U(1) gauge group can lead to distinguishable signatures at the LHC through shower patterns, which may reveal the mass origin of the dark sector. We study this subject further by examining the dark shower of two simplified models, the dubbed Chiral Model and the Vector Model. We derive a more complete set of collinear splitting functions with power corrections, specifying the helicities of the initial DM fermion and including the contribution from an extra degree of freedom, the dark Higgs boson. The dark shower is then implemented with these splitting functions, and the new features resulting from its correct modelling are emphasized. It is shown that the DM fermion chirality can be differentiated by measuring dark shower patterns, especially the DM jet energy profile, which is almost independent of the DM energy.


Jets QCD Phenomenology 


Open Access

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Copyright information

© The Author(s) 2019

Authors and Affiliations

  • Junmou Chen
    • 1
    Email author
  • Pyungwon Ko
    • 1
    • 2
  • Hsiang-nan Li
    • 4
  • Jinmian Li
    • 3
  • Hiroshi Yokoya
    • 2
  1. 1.School of PhysicsKorean Institute for Advanced StudySeoulKorea
  2. 2.Quantum Universe CenterKorean Institute for Advanced StudySeoulKorea
  3. 3.College of Physical Science and TechnologySichuan UniversityChengduChina
  4. 4.Institute of PhysicsAcademia SinicaTaipeiRepublic of China

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