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Feynman Propagators

  1. Jan 11, 2012 #1
    Hi, this is probably very simple but what is the difference between these two Feynman propagators:

    [tex] \frac{i}{q^2-m^2}[/tex]
    [tex] \frac{i(p/+m)}{p^2-m^2}[/tex]

    E.g. Is one used for the invariant amplitude and the other for loop integrals? Or is one for a fermion and the other for a boson? =s

    Thanks!
     
    Last edited: Jan 11, 2012
  2. jcsd
  3. Jan 11, 2012 #2

    Vanadium 50

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    The top one is for a scalar, the bottom one for a spin-1/2 particle.
     
  4. Jan 11, 2012 #3
    Thank you!
     
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