在幺正规范(ξ→∞)下推导t→cγ振幅  

Deriving the Amplitude of t→cγin the Gauge Unitary(ξ→∞)

作　　者：柳国丽 别素雅 LIU Guoli;BIE Suya(School of Physics, Zhengzhou University, Zhengzhou 450001, China)

机构地区：[1]郑州大学物理学院,河南郑州450001

出　　处：《郑州大学学报（理学版）》2021年第2期102-110,共9页Journal of Zhengzhou University:Natural Science Edition

基　　金：国家自然科学基金项目(11675147),郑州大学物理学科推进计划项目。

摘　　要：以μ→eγ为例,说明此类改变衰变过程在内线为矢量传播子时,不考虑约束条件的计算不能自动地消去单圈发散项的问题;然后从电磁场的规范不变性和Ward恒等式出发,给出以t→cγ为代表的衰变过程的洛伦兹结构;最后计算它在幺正规范下的散射振幅。计算的重点部分是选择t→cγ过程而不是继续沿用μ→eγ衰变过程。Firstlyμ→eγwas taken as an example to illustrate the fact that in such kind of flavor changing decay processes,when the inner mediated propagators were vector gauge bosons.The one-loop divergent terms could not be cancelled out automatically without considering the constraint conditions.Then with the electromagnetic gauge invariance and the Ward identity,the Lorentz structure of t→cγ,for instance,was given out.And finally,its scattering amplitudes were calculated.The reason why the process of t→cγbut not the decayμ→eγwas chosen,was that the former had an extra three-point diagram contribution,which was also the focus of this paper.This work was the first time to systematically and completely give the manual derivation details.

关 键 词：味道改变衰变 幺正规范 费曼积分 

分 类 号：O41[理学—理论物理]