Open Turgon-Aran-Gondolin opened 6 years ago
The easiest in this case will be start using the more explicit syntax which requires you to place the position of the start and end points explicitly:
\begin{tikzpicture}
\begin{feynman}
% code goes here
\end{feynman}
\end{tikzpicture}
There are examples of this in the documentation.
So for the little half-loop in the middle diagram, you'll be better of asking this on TeX StackExchange.
How to draw a textbook operator product expansion diagram like this? In another word, how to make lines to have some kind of angle between each other and how to separate two points only a little bit?