| Article | |
| Report number | arXiv:2008.04298 ; KCL-PH-TH/2020-28 ; CERN-TH-2020-076 |
| Title | Probing New Physics in Dimension-8 Neutral Gauge Couplings at $e^+e^-$ Colliders |
| Author(s) | Ellis, John (King's Coll. London ; CERN ; NICPB, Tallinn) ; He, Hong-Jian (Tsung-Dao Lee Inst., Shanghai ; Shanghai Jiao Tong U. ; Tsinghua U., Beijing ; Peking U., CHEP) ; Xiao, Rui-Qing (Tsung-Dao Lee Inst., Shanghai ; Shanghai Jiaotong U.) |
| Publication | 2020-10-30 |
| Imprint | 2020-08-10 |
| Number of pages | 25 |
| Note | 43pp, 9 Figs (32 plots) and 4 Tables. v4: refined Fig.9 by adding results of 5/ab integrated luminosity. v3: Only minor refinements to match online version in Science China, selected as "Editor's Focus" and "Cover Article" |
| In: | Sci. China Phys. Mech. Astron. 64 (2021) 221062 |
| DOI | 10.1007/s11433-020-1617-3 (publication) |
| Subject category | hep-ph ; Particle Physics - Phenomenology ; hep-ex ; Particle Physics - Experiment |
| 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 $Z\gamma Z^*$ and $Z\gamma\gamma^*$ vertices with rapid energy dependence $\propto E^5$, which can be probed sensitively via the reaction $e^+e^- \to Z\gamma$. We demonstrate that measuring the nTGCs via the reaction $e^+e^- \to Z\gamma$ followed by $Z \to q\bar{q}$ 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. 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 $e^+e^-Z\gamma$ vertex. |
| Copyright/License | publication: © Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 preprint: (License: arXiv nonexclusive-distrib 1.0) |
Corresponding record in: Inspire
Record created 2020-08-12, last modified 2023-11-10
