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

John Ellis*, Hong Jian He, Rui Qing Xiao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

56 Citations (Scopus)

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→ 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=(0.25−1) TeV, and up to the range (10–16) TeV at CLIC with 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+eZγ vertex.

Original languageEnglish
Article number221062
JournalScience China: Physics, Mechanics and Astronomy
Volume64
Issue number2
DOIs
Publication statusPublished - Feb 2021

Keywords

  • ee colliders
  • effective field theory
  • neutral triple gauge couplings
  • new physics beyond the standard model

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