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Peskin p. 160

  1. Apr 5, 2015 #1
    In peskin p. 160 forth paragraph they say to verefy Ward identity in equation 5.74.
    I don't succeed, they say some algebra is needed. I conjecture that this some algebra is what i miss.
    Any help will be appreciated - thanks a lot.
     
  2. jcsd
  3. Apr 5, 2015 #2

    Hepth

    User Avatar
    Gold Member

    Remember that ##\not k \not k = 0## and that from momentum conservation ## k' - k = p - p'##

    So you may end up with something like ##\bar{u}(p') (\not p - \not p') u(p')##, which you can use equation of motion to get ##m-m = 0##.
     
  4. Apr 6, 2015 #3
    Hurray... It got solved.
    Many many thank's.
     
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