Why Does Yukawa Scattering Focus on 2-to-2 Particle Processes?

[HomogenousCow]

Im currently reading these lectures notes on yukawa scattering (charged scalars and real scalars).
http://www.damtp.cam.ac.uk/user/tong/qft.html
In the interaction part he focuses strictly on 2 particle to 2 particle scattering, is there a reason other types are not discussed?
For example a 2 particle to 4 particle process, are these too complicated for an introduction to qft?
Also does anyone have any good resources for simple feynman diagrams?

 

[eljose79]

Hello,

Thank you for bringing up this interesting point about the lecture notes on Yukawa scattering. I can understand your curiosity about other types of scattering processes and their absence in the notes.

The reason for focusing strictly on 2 particle to 2 particle scattering in these notes could be to provide a clear and concise introduction to the concept of scattering in quantum field theory. This is a fundamental process that is important in understanding the behavior of particles and their interactions. Introducing more complex scattering processes, such as 2 particle to 4 particle, could potentially confuse or overwhelm readers who are new to the subject.

However, it is important to note that the principles and techniques discussed in the notes can be applied to other types of scattering processes as well. In fact, many advanced textbooks on quantum field theory do cover these processes in more detail.

As for resources on simple Feynman diagrams, I would recommend checking out other lecture notes or textbooks on quantum field theory, as well as online resources such as YouTube videos or interactive simulations. It may also be helpful to practice drawing Feynman diagrams for different processes to improve your understanding.

I hope this helps clarify your question. Keep exploring and learning about quantum field theory!