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Results tagged with feynman-diagrams
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user 266156
A diagrammatic technique introduced by Richard Feynman to describe the quantum behaviour of subatomic particles and their interactions. Do not use for general questions on diagrams that are not of the Feynman kind.
4
votes
$S$-matrix from LSZ
You're not quite using the LSZ reduction formula properly. As part of LSZ, you're supposed to take the residue of the poles as all external momenta go on-shell. If you start by including propagators f …
- 3,949
4
votes
Why do the counterterms in renormalized $\phi^4$-theory with power two in fields give vertic...
This comes from treating
$$\frac{1}{2}(\partial_\mu\phi_r)^2-\frac{1}{2}m^2\phi_r^2$$
as the free Lagrangian, and treating
$$-\frac{\lambda}{4!}\phi_r^4+\frac{1}{2}\delta_Z(\partial_\mu\phi_r)^2-\frac …
- 3,949