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Homework Help: Bhabha scattering

  1. May 15, 2010 #1
    I cannot figure out why there is a relative sign difference between the two diagrams for bhabha scattering. Fermi statistics is at play here but I don't see how that affects the relative sign between 2 different diagram...
     
  2. jcsd
  3. May 15, 2010 #2
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