I am trying to draw Feynman diagrams with two loops. I have managed to draw the following one:
\documentclass[DIV=14,headsepline]{scrartcl}
\usepackage[T1]{fontenc}
\usepackage[utf8]{luainputenc}
\usepackage[compat=1.1.0]{tikz-feynman}
\begin{document}
\[
\feynmandiagram[horizontal=a to b, layered layout]{
a[dot] -- c [dot] --[out=135, in=45, loop, min distance=2cm,insertion=0.5] c -- b [dot],
};
\]
\end{document}
Which gives me,
I would like to add another loop just above the first one but I don't know how. I have tried using tikzpicture
but I haven't arrived to any result.
Another problem I have is that I would like some dots to be bigger in order to have source terms (big dots) and vertices (small dots) but I don't know how to do it either. [big=dot]
is not working.
Thank you in advance.
\usepackage[compat=1.1.0]{tikz-feynman}