- #1
blackie1008
- 5
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Hi,
I have been deriving the renormalisation constants in QED as part of my project. I have been using Peskin and Schroeder. I am a bit confused with a couple of things and was wondering if anyone could please help!
Firstly, why do we chose not to absorb the Z_3 constant in the electron charge but rather the photon wavefunction?
Secondly, why, when we have used the Ward identity to prove Z_1=Z_2 do we then include them separately in the electron charge renormalisation when they just cancel?
(This is around about p330-331 in Peskin and Schroeder)
I have been deriving the renormalisation constants in QED as part of my project. I have been using Peskin and Schroeder. I am a bit confused with a couple of things and was wondering if anyone could please help!
Firstly, why do we chose not to absorb the Z_3 constant in the electron charge but rather the photon wavefunction?
Secondly, why, when we have used the Ward identity to prove Z_1=Z_2 do we then include them separately in the electron charge renormalisation when they just cancel?
(This is around about p330-331 in Peskin and Schroeder)