% mod_tex: distributed LaTeX-rendering over Apache % Copyright (C) 2007 Peter Danenberg % See doc/COPYING for details. \documentclass[12pt]{article} \usepackage[nonstop]{feynmp} \unitlength=1mm \pagestyle{empty} \begin{document} \begin{fmffile}{feyn-mp} \begin{fmfchar*}(40,25) \begin{fmfgraph*}(40,25) \fmfpen{thick} \fmfleft{i1,i2} \fmflabel{$\bar{b}$}{i1} \fmflabel{$d$}{i2} \fmfright{o1,o2} \fmflabel{$\bar{d}$}{o1} \fmflabel{$b$}{o2} \fmf{fermion}{i1,v1} \fmf{fermion,label=$\bar{t},,\bar{c},,\bar{u}$, l.side=right}{v1,v3} \fmf{fermion}{v3,o1} \fmf{fermion}{o2,v4} \fmf{fermion,label=$t,,c,,u$,l.side=right}{v4,v2} \fmf{fermion}{v2,i2} \fmf{photon,label=$W^+$,l.side=left}{v1,v2} \fmf{photon,label=$W^-$,l.side=right}{v3,v4} \fmfdotn{v}{4} \end{fmfgraph*} \end{fmfchar*} \end{fmffile} \end{document}