Compton scattering

compton.tex

\begin{figure}
	\centering
	\begin{fmffile}{compton}
		\begin{fmfgraph*}(80,50)
			\fmfleft{i1,i2}
			\fmfright{o1,o2}

			\fmflabel{$\gamma$}{i2}
			\fmflabel{$e^-$}{i1}
			\fmflabel{$\gamma$}{o1}
			\fmflabel{$e^-$}{o2}

			\fmf{photon}{i2,v2}
			\fmf{fermion}{i1,v1,v2,o2}
			\fmf{photon}{v1,o1}
		\end{fmfgraph*}
	\end{fmffile}

	\caption[Compton Scattering]{Feynman diagram for Compton scattering}
	\label{fig:compton-scattering}
\end{figure}