Recent content by blackie1008

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...

Hi, I have been calculating the 3 infinities in QED as part of my project (vacuum polarisation, vertex corrections and electron self energy). Mostly I have been following the description in Mandl and Shaw for determining the first two (chapter 10, sections starting on p211). However it does...

Ahhh ok think I have got it now! Thanks for the help, its much appreciated!

Thanks for clearing up question 2, but as for question 1, by "representing the counterterms themselves" do you mean that it represents all the contributions that are taken into account?

Hi, I have been looking at the renormalisation of QED and been using Peskin & Schroeder. I understand (I think) what is going on, but I am slightly confused over 2 issues: 1. In the new feynman rules from the counterterms, the feynman diagrams all have a small circle with a cross in...