Probing the scale of new physics in the ZZγ coupling at e+e-colliders

John Ellis; Shao Feng Ge; Hong Jian He; Rui Qing Xiao

doi:10.1088/1674-1137/44/6/063106

Probing the scale of new physics in the ZZγ coupling at e⁺e^-colliders

John Ellis, Shao Feng Ge, Hong Jian He^*, Rui Qing Xiao

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

66 Citations (Scopus)

Abstract

The = ZZγ 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 Zγ followed by Z\to\ell\bar\ell,\nu\bar\nu decays, at future e+e- colliders including the CEPC, FCC-ee, ILC and CLIC. We demonstrate how angular distributions of the final-state mono-photon and leptons can play a key rôle in suppressing SM backgrounds. We further demonstrate 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.

Original language	English
Article number	063106
Journal	Chinese Physics C
Volume	44
Issue number	6
DOIs	https://doi.org/10.1088/1674-1137/44/6/063106
Publication status	Published - Jun 2020

Keywords

beyond Standard Model
eecolliders
Neutral triple gauge coupling

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10.1088/1674-1137/44/6/063106

Cite this

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abstract = "The = ZZγ 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 Zγ followed by Z\to\ell\bar\ell,\nu\bar\nu decays, at future e+e- colliders including the CEPC, FCC-ee, ILC and CLIC. We demonstrate how angular distributions of the final-state mono-photon and leptons can play a key r{\^o}le in suppressing SM backgrounds. We further demonstrate 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. ",

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author = "John Ellis and Ge, {Shao Feng} and He, {Hong Jian} and Xiao, {Rui Qing}",

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AU - Xiao, Rui Qing

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AB - The = ZZγ 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 Zγ followed by Z\to\ell\bar\ell,\nu\bar\nu decays, at future e+e- colliders including the CEPC, FCC-ee, ILC and CLIC. We demonstrate how angular distributions of the final-state mono-photon and leptons can play a key rôle in suppressing SM backgrounds. We further demonstrate 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.

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Probing the scale of new physics in the ZZγ coupling at e⁺e^-colliders

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