% smtau.mp -- do not edit, generated automatically by pseyfert.tex
input feynmp
require_RCS_revision "1.30";
beginchar(1, 170*1.0pt#, 80*1.0pt#, 0);
"feynmf: 1";
LaTeX_unitlength:=1.0pt;
subgraph (0, 0, w, h);
vinit;
pickup pencircle scaled thin;
straight_galleries;
vleft (__is3, __is2, __is1, __i1, __i2, __i3, __i4, __i5, __i6);
vright (__os3, __os2, __os1, __o1, __o2, __o3, __o4, __o5, __o6);
vconnect ("phantom", __o1, __g1);
vconnect ("phantom,tension=1.5", __g1, __i1);
vfreeze;
vconnect ("photon, tension=2.,lab.side=left, lab=$\Pphoton /\PZ $", __g1, __g2);
vconnect ("fermion,lab.side=left,label=$\APmuon $", __o3, __g2);
vconnect ("fermion,lab.side=left,label=$\Pmuon $", __g2, __o5);
vconnect ("phantom,tension=1.5", __i6, __g2);
vfreeze;
vconnect ("fermion,lab.side=left,label=$\Pgtm $", __i1, __w1);
vconnect ("dashes,lab.side=right,label=$\PWminus $", __w1, __w2);
vconnect ("fermion,lab.side=right,label=$\Pmuon $", __w2, __o1);
path p[];
vconnect ("plain,tension=0,right,label={$\Pgngt \to \Pgngm $},tag=1", __w1, __w2);
vfreeze;
p1:=vpath1(__w1,__w2);
ivertex ("d.sh=cross,d.ang=0,d.size=5thick", point length(p1)/2 of p1);
vfreeze;
vdraw;
endsubgraph;
endchar;
% the end.
end.
endinput;