Journal
CHINESE PHYSICS C
Volume 44, Issue 6, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1674-1137/44/6/063106
Keywords
neutral triple gauge coupling; beyond Standard Model; e(+)e(-) colliders
Categories
Funding
- United Kingdom STFC [ST/P000258/1]
- Estonian Research Council via a Mobilitas Pluss grant
- TDLI distinguished visiting fellow programme
- National NSF of China [11675086, 11835005]
- CAS Center for Excellence in Particle Physics (CCEPP)
- National Key RAMP
- D Program of China [2017YFA0402204]
- Shanghai Laboratory for Particle Physics and Cosmology [11DZ2260700]
- Office of Science and Technology, Shanghai Municipal Government [16DZ2260200]
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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(-) -> Z gamma followed by Z -> l (l) over bar, v (v) over bar 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 role 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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