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

Chinese Physics C 2020年第6期44卷 55-86页

作者： John Ellis Shao-Feng Ge Hong-Jian He Rui-Qing Xiao Department of Physics Kings College LondonStrandLondon WC2R 2LSUKTheoretical Physics DepartmentCERNCH-1211 Geneva 23SwitzerlandNICPBRävala 1010143 TallinnEstonia Tsung-Dao Lee Institute&School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China Institute of Modern Physics Tsinghua UniversityBeijing 100084China Center for High Energy Physics Peking UniversityBeijing 100871China

The Z Zγtriple neutral gauge couplings are absent in the Standard Model(SM)at the tree *** receive no contributions from dimension-6 effective operators,but can arise from effective operators of *** study the scale of new physics associated with such dimension-8 operators that can be probed by measuring the reaction e^+e^-→Zγ followed by Z→■■,vv decays,at future e^+e^- colliders including the CEPC,FCC-ee,ILC and *** demonstrate how angular distributions of the final-state mono-photon and leptons can play a key rôle in suppressing SM *** further demonstrate that using electron/positron beam polarizations can significantly improve the signal *** find that the dimension-8 new physics scale can be probed up to the multiTeV region at such lepton colliders.

关键词： neutral triple gauge coupling beyond Standard Model e^+e^-colliders

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Probing new physics in dimension-8 neutral gauge couplings at e^+e^-colliders

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Science China(Physics,Mechanics & Astronomy) 2021年第2期64卷 2-26页

作者： John Ellis Hong-Jian He Rui-Qing Xiao Department of Physics Kings College LondonStrandLondonWC2R 2LSUK Theoretical Physics Department CERNCH-1211Geneva 23Switzerland nicpb Rävala 10Tallinn10143Estonia Tsung-Dao Lee Institute&School of Physics and Astronomy Shanghai Key Laboratory for Particle Physics and CosmologyShanghai Jiao Tong UniversityShanghai200240China Institute of Modern Physics and Department of Physics Tsinghua UniversityBeijing100084China Center for High Energy Physics Peking UniversityBeijing100871China

Neutral triple gauge couplings(nTGCs)are absent in the standard model effective theory up to dimension-6 operators,but could arise from dimension-8 effective *** this work,we study the pure gauge operators of dimension-8 that contribute to nTGCs and are independent of the dimension-8 operator involving the Higgs *** show that the pure gauge operators generate both ZγZ^*and Zγγ^*vertices with rapid energy dependence∝E^5,which can be probed sensitively via the reaction e^+e^-→Zγ.We demonstrate that measuring the nTGCs via the reaction e^+e^-→Zγfollowed by Z→qq decays can probe the new physics scales of dimension-8 pure gauge operators up to the range(1-5)TeV at the CEPC,FCC-ee and ILC colliders with s~(1/2)=(0.25-1)TeV,and up to the range(10-16)TeV at CLIC with s~(1/2)=(3-5)TeV,assuming in each case an integrated luminosity of 5 ab~(-1).We compare these sensitivities with the corresponding probes of the dimension-8 nTGC operators involving Higgs doublets and the dimension-8 fermionic contact operators that contribute to the e^+e^-Zγvertex.

关键词： neutral triple gauge couplings new physics beyond the standard model effective field theory e^+e^-colliders

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