- #1
eoghan
- 207
- 7
Hi everybody!
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?
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?