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Kähllén-Lehmann formula and MS scheme

  1. Sep 18, 2012 #1
    Hi everybody!
    Using "physical normalization conditions" I find for the electron self energy
    where [itex]m[/itex] is the physical mass of the electron. Then [itex]Z_2[/itex] is the same constant appearing in the Kähllén-Lehmann representation (it is the residue at the pole of the physical propagator).
    However, if I compute [itex]Z_2[/itex] in MS scheme, can I say that the [itex]Z[/itex] I found is not the same [itex]Z[/itex] in Kähllén-Lehmann?
  2. jcsd
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