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How to derive a numerator relation in vertex correction in Peskin p191

  1. Aug 29, 2011 #1
    i.e.

    p191.png

    thank you very much in advance
     
  2. jcsd
  3. Aug 29, 2011 #2
    i got it, first by l:=k+yq-zp transform k into l, then remove odd terms of l, then use 6.46
     
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