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Using "physical normalization conditions" I find for the electron self energy

[tex]

Z_2^{-1}=1-\frac{d\Sigma}{dp}(p=m)

[/tex]

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?

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# Kähllén-Lehmann formula and MS scheme

Can you offer guidance or do you also need help?

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