2017/12/31 by Jia Liu, Lian-Tao Wang, Xiao-Ping Wang +1 · 1 citation
Physics and Astronomy · #hep-ph
paper · pdf · doi:10.1103/physrevd.97.095044
published as Phys. Rev. D 97, 095044 (2018) · 42 pages, 16 figures, 2 tables. v2: references added, particle separation improved, minor changes in figures, version matched to the journal
arxiv created 2018/05/11 · arxiv updated 2018/06/06
We investigate the prospects of searching dark sector models via exotic Z-boson decay at future e+ e- colliders with Giga Z and Tera Z options. Four general categories of dark sector models: Higgs portal dark matter, vector portal dark matter, inelastic dark matter and axion-like particles, are considered. Focusing on channels motivated by the dark sector models, we carry out a model independent study of the sensitivities of Z-factories in probing exotic decays. The limits on branching ratios of the exotic Z decay are typically O (10-6 - 10-8.5) for the Giga Z and O (10-7.5 - 10-11) for the Tera Z, and they are compared with the projection for the high luminosity LHC. We demonstrate that future Z-factories can provide its unique and leading sensitivity, and highlight the complementarity with other experiments, including the indirect and direct dark matter search limits, and the existing collider limits. Future Z factories will play a leading role to uncover the hidden sector of the universe in the future.