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

John Ellis; Hong Jian He; Rui Qing Xiao

doi:10.1007/s11433-020-1617-3

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 journal › Article › peer-review

66 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⁺e⁻Zγ vertex.

Original language	English
Article number	221062
Journal	Science China: Physics, Mechanics and Astronomy
Volume	64
Issue number	2
DOIs	https://doi.org/10.1007/s11433-020-1617-3
Publication status	Published - Feb 2021

Keywords

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

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10.1007/s11433-020-1617-3

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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→ 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+e−Zγ vertex.",

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doi = "10.1007/s11433-020-1617-3",

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AB - 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+e−Zγ vertex.

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

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