I want to use feynmp
to draw the one-loop correction to the vertex in phi^3 theory. This is just a circle with three evenly-spaced incoming lines. The thing is I want the figure to be dashed, so using pre-defined polygons won't work.
The best I can do is this, but I want it to be a circle in the middle, not a tragically deformed hexagon:
\documentclass{article}
\usepackage{feynmp}
\begin{document}
\unitlength = 1mm
\begin{figure}[!h]
\begin{fmffile}{test1}
\begin{fmfgraph*}(48,20)
\fmfcurved
\fmfleft{i1,i2,i3}
\fmfright{o1,o2,o3}
\fmftop{t1,t2,t3}
\fmfbottom{b1,b2,b3}
\fmf{plain}{i2,v1}
\fmf{plain}{v1,v2,v3,v4,v5,v6,v7,v8,v9,v10,v11,v12,v1}
\fmf{phantom}{v4,t2}
\fmf{phantom}{v10,b2}
\fmf{phantom}{v7,o2}
%\fmffreeze
\fmf{plain}{v5,t3}
\fmf{plain}{v9,b3}
\end{fmfgraph*}
\end{fmffile}
\end{figure}
\end{document}
Best Answer
I normally use
TikZ
for typesetting Feynman diagrams, but I don't typeset that many. I looked a little in the documentation feynMF and came up with this:Output:
Please change the values for
left
andtension
and see what happens.I don't like this package. Hmm... maybe I just don't understand it properly.