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The $ZZ\gamma$ triple neutral gauge couplings are absent in the StandardModel (SM) at the tree level. They receive no contributions from dimension-6effective operators, but can arise from effective operators of dimension-8. Westudy the scale of new physics associated with such dimension-8 operators thatcan be probed by measuring the reaction $e^+e^-\to Z\gamma$, followed by $Z \to\ell\bar{\ell},\nu\bar{\nu}$ decays, at future $e^+e^-$ colliders including theILC, CEPC, FCC-ee and CLIC. We demonstrate how angular distributions of thefinal state mono-photon and leptons can play a key role in suppressing SMbackgrounds. We further show that using electron/positron beam polarizationscan significantly improve the signal sensitivities. We find that thedimension-8 new physics scale can be probed up to the multi-TeV region at suchlepton colliders.

Probing the Scale of New Physics in the $ZZ\gamma$ Coupling at $e^+e^-$ Colliders