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[en] 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 authors' 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. The authors discuss the definition of polarization vector and point out the error of Glover paper
Journal
High Energy Physics and Nuclear Physics; ISSN 0254-3052; 
; v. 24(12); p. 1098-1105
; v. 24(12); p. 1098-1105