η_(c)→γl^(+)l^(-)衰变研究  

The Decays ofη_(c)→γl^(+)l^(-)

作　　者：王文欢[1] 谭英华 张振宇[1] 周详[1] WANG Wenhuan;TAN Yinghua;ZHANG Zhenyu;ZHOU Xiang(School of Physics and Technology,Wuhan University,Wuhan 430072,Hubei,China)

机构地区：[1]武汉大学物理科学与技术学院,湖北武汉430072

出　　处：《武汉大学学报（理学版）》2022年第3期227-235,共9页Journal of Wuhan University:Natural Science Edition

基　　金：国家自然科学基金(U2032114)。

摘　　要：在有效场理论和几种不同矢量介子主导(vector meson dominance,VMD)模型的基础上,考虑介子波函数尺寸效应,引入量子色动力学(quantum chromodynamics,QCD)因子,研究了η_(c)→γl^(+)l^(-)的单达利兹衰变;计算了η_(c)衰变到γl^(+)l^(-)(l=e,μ)与双光子的相对衰变宽度,给出了相对微分衰变宽度随轻子对l+l-的不变质量谱的分布,并估计了区分不同模型需要的η_(c)、Jψ、ψ(3686)、h_(c)和B介子事例数。In this paper,based on the effective field theory and several different Vector Meson Dominant(VMD)Models,a quan⁃tum chromodynamics(QCD)factor is introduced because of the size effect of meson wave function,and the decays ofη_(c)→γl+lare studied.We calculate the relative decay width ofη_(c)→γl^(+)l^(-)(l=e,μ)overη_(c)→γγ,and obtain the dependencies of the relative differential decay widths on the invariant mass spectrum distributions of the lepton pairs l+l-,and estimate the number of cases ofη_(c),Jψ,ψ(3686),h_(c) and B meson needed to distinguish between different models.

关 键 词：赝标量介子 η_(c)衰变 矢量介子主导(VMD)模型 量子色动力学(QCD)因子 衰变振幅 

分 类 号：O572.33[理学—粒子物理与原子核物理]