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\documentclass{ppex}
\nonstopmode
\AtEndDocument {\end {fmffile}} \AtBeginDocument {\begin {fmffile}{ftmp}}
\usepackage {feynmp}
\pagestyle{empty}
\begin{document}
\ResetPreambleCommands
\ReadyForTheFray
\usepackage {feynmp}
\begin{fmfgraph*}(100,60)
\fmfleftn{i}{2} \fmfrightn{o}{4}
\fmflabel{$e_-$}{i1}\fmflabel{$e_+$}{i2}
\fmflabel{$\mu_+$}{o1}
\fmflabel{$\nu_{\mu}$}{o2}
\fmflabel{$s$}{o3}
\fmflabel{$\bar c$}{o4}
\fmf{fermion}{i1,v1,i2}
\fmf{boson,label=$\gamma,,Z$}{v1,v2}
\fmf{boson}{v3,v2,v4}
\fmf{fermion}{o1,v3,o2}
\fmf{fermion}{o4,v4,o3}
\fmfdot{v1,v3,v4}\fmfblob{.12w}{v2}
\end{fmfgraph*}
\end{document}
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