Feynman Diagrams in Tikz

There is a package for making Feynman diagrams in LaTeX. Unfortunately, it is old and dvi latex only. If you are using pdflatex or lualatex, as you should be, it does not work. Even in regular LaTeX, it’s a bit of a pain. Why is there not a new package for pdflatex? Turns out, you don’t need one. Due to the powerful drawing library Tikz, you can create any diagram easily, and can customize it completely. For example:

Example diagram

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