In a radiative seesaw model, one-loop contributions from Majorana neutrinos to the ZZh vertex produce CP-conserving anomalous couplings of order 10^{-3} potentially observable at future lepton colliders, while CP-violating effects remain suppressed.
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New physics in the $ZZh$ vertex: One-loop contributions from a radiative seesaw model
In a radiative seesaw model, one-loop contributions from Majorana neutrinos to the ZZh vertex produce CP-conserving anomalous couplings of order 10^{-3} potentially observable at future lepton colliders, while CP-violating effects remain suppressed.