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

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Abstract

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 operators. In 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 doublet. We show that the pure gauge operators generate both ZγZ* and Zγγ* vertices with rapid energy dependence ∝ E5, which can be probed sensitively via the reaction e+e− → Zγ. We demonstrate that measuring the nTGCs via the reaction e+e− → Zγ followed by \(Z\rightarrow q\bar{q}\) 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 \(\sqrt{s}=(0.25-1)\) TeV, and up to the range (10–16) TeV at CLIC with \(\sqrt{s}=(3-5)\) 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−Zγ vertex.

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Author information

Authors and Affiliations

  1. Department of Physics, Kings College London, Strand, London, WC2R 2LS, UK

    John Ellis

  2. Theoretical Physics Department, CERN, CH-1211, Geneva 23, Switzerland

    John Ellis

  3. NICPB, Rävala 10, Tallinn, 10143, Estonia

    John Ellis

  4. Tsung-Dao Lee Institute & School of Physics and Astronomy, Shanghai Key Laboratory for Particle Physics and Cosmology, Shanghai Jiao Tong University, Shanghai, 200240, China

    John Ellis, Hong-Jian He & Rui-Qing Xiao

  5. Institute of Modern Physics and Department of Physics, Tsinghua University, Beijing, 100084, China

    Hong-Jian He

  6. Center for High Energy Physics, Peking University, Beijing, 100871, China

    Hong-Jian He

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  1. John Ellis
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Corresponding authors

Correspondence to John Ellis, Hong-Jian He or Rui-Qing Xiao.

Additional information

We thank Manqi Ruan, Philipp Roloff, Michael Peskin, Tao Han, Tim Barklow and Jie Gao for useful discussions. The work of John Ellis was supported in part by United Kingdom STFC (Grant No. ST/P000258/1), in part by the Estonian Research Council via a Mobilitas Pluss grant, and in part by the TDLI distinguished visiting fellow programme. The work of Hong-Jian He and Rui-Qing Xiao was supported in part by the National Natural Science Foundation of China (Grant Nos. 11675086, and 11835005). Hong-Jian He is also supported in part by the CAS Center for Excellence in Particle Physics (CCEPP), the National Key R&D Program of China (Grant No. 2017YFA0402204), the Key Laboratory for Particle Physics, Astrophysics and Cosmology (Ministry of Education), and by the Office of Science and Technology, Shanghai Municipal Government (Grant No. 16DZ2260200).

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Ellis, J., He, HJ. & Xiao, RQ. Probing new physics in dimension-8 neutral gauge couplings at e+e− colliders. Sci. China Phys. Mech. Astron. 64, 221062 (2021). https://doi.org/10.1007/s11433-020-1617-3

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