I am trying to draw this feynman diagram
The part that's a bit tricky is the parallel lines, in the laeft and right side of the diagram. How to do that?
I've tried searching in feynmf
's manual. I saw a similar diagram, which was using
\fmffreeze
\fmfi{plain}{vpath (__i1,__b) shifted (thick*(0,2))}
\fmfi{plain}{vpath (__i1,__b) shifted (thick*(1,-2))}
but in my case it only produces 2 lines on the left side...
My code is
\documentclass{article}
\usepackage{feynmp-auto}
\unitlength=1mm
\begin{document}
\begin{fmffile}{ElasticScattering}
\fmfframe(1,7)(1,7){
\begin{fmfgraph}(40,25)
\fmfleft{i1,i2}
\fmfright{o1,o2}
\fmfbottom{b}
\fmf{fermion}{i2,v1,o2}
\fmf{photon}{v1,b}
\fmfblob{.15w}{b}
\fmf{phantom}{i1,b,o1}
\fmffreeze
\fmfi{plain}{vpath (__i1,__b) shifted (thick*(0,2))}
\fmfi{plain}{vpath (__i1,__b) shifted (thick*(1,-2))}
\end{fmfgraph}}
\end{fmffile}
\end{document}
My result is