Phenomenology of heavy neutral gauge boson at muon collider

作     者：Zongyang Lu Honglei Li Zhi-Long Han Zong-Guo Si Liuxin Zhao 

作者机构：School of Physics and TechnologyUniversity of JinanJinan 250022China School of PhysicsShandong UniversityJinan 250100China 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学：物理学、力学、天文学（英文版）)

年 卷 期：2024年第67卷第3期

页      面：60-79页

核心收录：

学科分类：07[理学] 070202[理学-粒子物理与原子核物理] 0702[理学-物理学] 

基　　金：supported by the Natural Science Foundation of Shandong Province (Grant No. ZR2022MA065) the National Natural Science Foundation of China (Grant No. 12235008)。 

主　　题：Z′boson muon collider new physics 

摘      要：Heavy neutral gauge boson Z is proposed in many new physics models.It has rich phenomena at the future muon collider.We study the properties of Z boson with the process of μ^(+)μ^(-)→qq,μ^(+)μ^(-)→l^(+)l^(-),μ^(+)μ^(-)→ ZH and μ^(+)μ^(-)→ W^(+)W^(-).The discrepancy of Z coupling to different types of particles can be shown in the cross section distributions around the resonance peak of various decay modes.Angular distributions of the final quark or lepton in μ^(+)μ^(-)→qq/l^(+)l^(-)process are sensitive to the parameters such as mass of Z and the Z-Z mixing angle.The interaction of new gauge boson coupling to the standard model gauge particles and Higgs boson are also studied through μ^(+)μ^(-)→ ZH→l^(+)l^(-)bb and μ^(+)u^(-)→ W^(+)W^(-)→l^(+)l^(-)v_(l)v_(l).The cross section and the final particles angular distributions with the contribution of Z boson differ from those processes with only standard model particles.A forward-backward asymmetry defined by the angular distribution is provided to show the potential of searching for new physics at the muon collider.Especially,the beam polarization with certain value can effectively enlarge the forward-backward asymmetry.