I'm looking for detailed example/calculation of the scattering amplitude between two particles (mesons) in $\phi^4$-perturbation theory using the path integral formalism. Do anyone of you guys have a good example to share? Maybe some old exercise of yours or a link to the web.
I'm using the book Quantum Field theory in a Nutshell and I'm currently reading chapter 1.7 (Feynman Diagrams) and I really wish there was a more detailed description of the calculations for the scattering amplitude of collision between particles. That's why I think an example would be of great educational help to me.