Probing neutral triple gauge couplings via Z_(γ)(l+l-y)production at e^(+)e^(-)colliders  

作　　者：Danning Liu Rui-Qing Xiao Shu Li John Ellis Hong-Jian He Rui Yuan 

机构地区：[1]Tsung-Dao Lee Institute,Shanghai Jiao Tong University,Shanghai 201210,China [2]Institute of Nuclear and Particle Physics,School of Physics and Astronomy,Key Laboratory for Particle Astrophysics and Cosmology(MOE),Shanghai Key Laboratory for Particle Physics and Cosmology(SKLPPC),Shanghai Jiao Tong University,Shanghai 200240,China [3]Department of Physics,King’s College London,Strand,London WC2R 2LS,UK [4]Center for High Energy Physics,Peking University,Beijing 100871,China [5]Theoretical Physics Department,CERN,CH-1211 Geneva 23,Switzerland

出　　处：《Frontiers of physics》2025年第1期1-14,共14页物理学前沿(英文版)

摘　　要：Neutral triple gauge couplings(nTGCs)are absent in the Standard Model(SM)and at the dimension-6 level in the Standard Model Effective Field Theory(SMEFT),arising first from dimension-8 operators.As such,they provide a unique window for probing new physics beyond the SM.These dimension-8 operators can be mapped to nTGC form factors whose structure is consistent with the spontaneously-broken electroweak gauge symmetry of the SM.In this work,we study the probes of nTGCs in the reaction e^(+)e^(-)→Z_(γ)with Z→l^(+)l^(-)(l=e,μ)at an e^(+)e^(-)collider.We perform a detector-level simulation and analysis of this reaction at the Circular Electron Positron Collider(CEPC)with collision energy√s=240 GeV and an integrated luminosity of 20 ab−1.We present the sensitivity limits on probing the new physics scales of dimension-8 nTGC operators via measurements of the corresponding nTGC form factors.

关 键 词：anomalous gauge coupling future colliders Zγ effective field theory neutral triple gauge coupling 

分 类 号：O57[理学—粒子物理与原子核物理]