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. 2022 Apr 4;82(4):290. doi: 10.1140/epjc/s10052-022-10127-0

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© The Author(s) 2022

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Fig. 1 — Feynman diagrams for Higgs boson decay via the kinetic-mixing (left) or Higgs-mixing mechanism (right) [7]. The symbol $h$ represents the Higgs boson, and s represents the dark Higgs boson. The symbol $ε$ represents the kinetic-mixing parameter while $κ$ represents the Higgs-mixing parameter