ILoveParticlePhysics
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- What is the formula for calculating the repulsion/attraction of charged particles in quantum electrodynamics?
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So, I calculate and draw the Feynman diagram, from which I get the S matrix elements from which I get the cross section of scattering processes which tells me how everything is going to repel/attract, right?vanhees71 said:You just draw the Feynman diagram and calculute it according to the rules derived from the formalism. Feynman diagrams are just an ingenious shortcut to do these perturbative calculations. What you get are transition-matrix elements (S-matrix elements) from which you can calculate cross sections of scattering processes.
This might sound dumb, but what exactly is 2nd order.Vanadium 50 said:Note that you will need to calculate this to at least second order, because at leading order the scattering is the same either way.
ILoveParticlePhysics said:This might sound dumb, but what exactly is 2nd order.