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janecool鐵桿木蟲 (著名寫手)
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【交流】看看大家都是怎樣計(jì)算正負(fù)電子湮滅的截面的 已有4人參與
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Your Feynman diagram is OK. As for the invariant matrix element, there is a complex number "i" missing in the 1st line while a "\sum" is lost in the second line. If you wanna further calculations of this cross section, analyse the kinematics in the center of mass frame and then integrate over the whole phase space. This is a 2 to 2 process. We can do it by hand easily. I will show my calculations tonight if I have free time. Good luck. |
鐵桿木蟲 (著名寫手)

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