\documentclass{ppex} \nonstopmode \AtEndDocument {\end {fmffile}} \AtBeginDocument {\begin {fmffile}{ftmp}} \usepackage {feynmp} \pagestyle{empty} \begin{document} \ResetPreambleCommands \ReadyForTheFray \usepackage {feynmp} \fbox{\begin{fmfgraph}(100,40) \fmfleft{w}\fmfright{e} \fmf{boson}{w,vw}\fmf{boson}{ve,e} \fmf{fermion,tension=.5}{vw,vn,ve,vs,vw} \fmf{gluon}{vn,vs} \fmffixed{(0,h)}{vn,vs} \fmfdot{vw,vn,ve,vs} \end{fmfgraph}} \fbox{\begin{fmfgraph}(100,40) \fmfleft{w}\fmfright{e} \fmf{boson}{w,vw}\fmf{boson}{ve,e} \fmf{phantom,left,tension=.4}{vw,ve,vw} \fmfdot{vw,ve} \fmffreeze \fmfipath{pn,ps}\fmfipair{vn,vs} \fmfiequ{pn}{vpath (__vw, __ve)} \fmfiequ{ps}{vpath (__ve, __vw)} \fmfiequ{vn}{point .5length(pn) of pn} \fmfiequ{vs}{point .5length(ps) of ps} \fmfi{fermion}{subpath (0,.5)*length(pn) of pn} \fmfi{fermion}{subpath (.5,1)*length(pn) of pn} \fmfi{fermion}{subpath (0,.5)*length(ps) of ps} \fmfi{fermion}{subpath (.5,1)*length(ps) of ps} \fmfi{gluon}{vn--vs} \fmfiv{dec.sh=circle,dec.siz=2thick}{vn} \fmfiv{dec.sh=circle,dec.siz=2thick}{vs} \end{fmfgraph}} \end{document}