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Question on spin-zero Feynman rules

  1. Mar 12, 2013 #1
    Hi everyone. I have a very silly question. What is the Feynman rule for external legs of spin-zero boson? Is it just to multply by 1?

    Thank you
     
  2. jcsd
  3. Mar 12, 2013 #2
    yes. Look in Maggiore "Modern introduction in QFT" or Greiner "Field Quantization".
     
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