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Probing the Scale of New Physics in the $ZZ\gamma$ Coupling at $e^+e^-$ Colliders
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abstract
The $ZZ\gamma$ triple neutral gauge couplings are absent in the Standard Model (SM) at the tree level. They receive no contributions from dimension-6 effective operators, but can arise from effective operators of dimension-8. We study the scale of new physics associated with such dimension-8 operators that can 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 the ILC, CEPC, FCC-ee and CLIC. We demonstrate how angular distributions of the final state mono-photon and leptons can play a key role in suppressing SM backgrounds. We further show that using electron/positron beam polarizations can significantly improve the signal sensitivities. We find that the dimension-8 new physics scale can be probed up to the multi-TeV region at such lepton colliders.
Forward citations
Cited by 2 Pith papers
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Consistency of the Standard Model Effective Field Theory
Causality and analyticity of scattering amplitudes imply 27 independent bounds on the dimension-eight bosonic operators of the Standard Model Effective Field Theory.
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Precision measurement of the Z boson to electron neutrino coupling at the future circular colliders
The t-channel W exchange interference in e+e- to nu nu-bar gamma at FCC-ee allows the Z-nu_e coupling to be measured with about 1% statistical error, a factor twenty better than current knowledge.
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