Z→3γ及相关过程的解析手征振幅和极化矢量的讨论

Analytical Helicity Amplitudes for Z→3γ and It's Related Processes and Discussion of Polarization Vectors

给出了Ｚ→３γ及相关过程的解析手征振幅．结果与Ｇｌｏｖｅｒ等的结果不同，虽然手征振幅的这种差别并不影响总几率的计算，但它有直接的物理意义，并可为实验检验．同时对极化矢量的定义进行了讨论，并指出Ｇｌｏｖｅｒ文章之错误．

The analytical helicity amplitudes for Z→3γ and it's related processes via w-loop and charged scalar loop are presented. There are some differences between our results and those in Glover paper for Z→3γ via w-loop and fermion loop. Although these differences do not contradict the result of total decay width for Z→3γ, but the different helicity amplitudes have measurable physical meanings. We discuss the definition of polarization vector and point out the error of Glover paper.