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I'm getting familiar with drawing feynman diagrams using feynmf package and I was trying to draw this process. However, labels do not display in the diagrams. Is there any error? Please, let me know if there's one.

\begin{fmffile}{mu}
    \begin{enumerate}
    \item $\mu \rightarrow e\gamma$ (SM) \hfill\\
    \begin{fmfgraph*}(60,35)
    \fmfleftn{i}{2}
    \fmfrightn{o}{2}
    \fmf{plain,label=$\mu$}{i1,v1,v3,o1}
    \fmffreeze
    \fmf{phantom}{i2,v4,o2}
    \fmffreeze
    \fmf{zigzag,left=0.6,label=$W^+$,label.side=left}{v1,v2}
    \fmf{zigzag,left=0.6}{v2,v3}
    \fmf{photon,tension=1.5,label=$\gamma$}{v2,v4}
    \fmfdotn{v}{3}
    \end{fmfgraph*}
    \item $\mu \rightarrow e\gamma$ (MSSM) \hfill\\
    \begin{fmfgraph*}(60,35)
    \fmfleftn{i}{2}
    \fmfrightn{o}{2}
    \fmf{fermion,label=$\mu$}{i1,v1,v3,o1}
    \fmffreeze
    \fmf{phantom}{i2,v4,o2}
    \fmffreeze
    \fmf{dashes,left=0.6,label=$W^+$,label.side=left}{v1,v2}
    \fmf{dashes,left=0.6}{v2,v3}
    \fmf{photon,tension=1.5,label=$\gamma$}{v2,v4}
    \fmfdotn{v}{3}
    \end{fmfgraph*}
    \begin{fmfgraph*}(60,35)
    \fmfleftn{i}{2}
    \fmfrightn{o}{2}
    \fmf{phantom,label=$\mu$}{i1,v1,v3,o1}
    \fmffreeze
    \fmf{fermion}{i1,v1}
    \fmf{dashes}{v1,v3}
    \fmf{fermion}{v3,o1}
    \fmf{phantom}{i2,v4,o2}
    \fmffreeze
    \fmf{plain,left=0.6,label=$W^+$,label.side=left}{v1,v2}
    \fmf{plain,left=0.6}{v2,v3}
    \fmf{photon,tension=1.5,label=$\gamma$}{v2,v4}
    \fmfdotn{v}{3}
    \end{fmfgraph*}
    \end{enumerate}
\end{fmffile}
  • Welcome to TeX.sx! This is what I get with your code: i.imgur.com/ldqu5Ct.png using \usepackage{feynmp-auto}. Do you get something different? – Gonzalo Medina Sep 8 '15 at 15:58
  • When I use feynmp-auto the diagrams do not display at all :/ Do I need to install something? – Luis Rabanal Sep 8 '15 at 16:14
  • Weird. No, there should be no need for nothing else. Try a simple experiment; copy paste this code exactly as is: \documentclass{article} \usepackage{feynmp-auto} \begin{document} \begin{fmffile}{mu} \begin{fmfgraph*}(60,35) \fmfleftn{i}{2} \fmfrightn{o}{2} \fmf{plain,label=$\mu$}{i1,v1,v3,o1} \fmffreeze \fmf{phantom}{i2,v4,o2} \fmffreeze \fmf{zigzag,left=0.6,label=$W^+$,label.side=left}{v1,v2} \fmf{zigzag,left=0.6}{v2,v3} \fmf{photon,tension=1.5,label=$\gamma$}{v2,v4} \fmfdotn{v}{3} \end{fmfgraph*} \end{fmffile} \end{document} – Gonzalo Medina Sep 8 '15 at 16:19
  • And compile it. What do you get? – Gonzalo Medina Sep 8 '15 at 16:19
  • Same result, the diagram does not display in the pdf. – Luis Rabanal Sep 8 '15 at 16:28

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