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A question in QFT of Weinberg

  1. Dec 11, 2013 #1
    Please demonstrate for me that:
    In any theory,the propagator [itex]\Delta[/itex][itex]_{f}[/itex](k) of a field of type f has asymptotic behavior:


    where sf is ''spin'' of the field.For massive fields of Lorentz type (A,B) then sf=A+B.
    (However,dropping terms that because of gauge invariance have no effect,eg. photon has sf=0)
    (QFT of Weinberg Vol 1,&12.1 Degrees of Divergence)
  2. jcsd
  3. Dec 12, 2013 #2
    I know this is true for photon,W-Z boson,gluon,graviton,spin 1/2 fermion.But what about the other particles?
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