17 lines
406 B
TeX
17 lines
406 B
TeX
\documentclass{standalone}
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\usepackage{feynmp-auto}
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\begin{document}
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\begin{fmffile}{diagram}
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\begin{fmfgraph*}(120,80)
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\fmfleft{i1,i2}
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\fmfright{o1,o2}
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\fmf{fermion}{i1,w1,w2,i2}
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\fmf{fermion}{o1,w3,w4,o2}
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\fmf{photon}{w1,w3}
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\fmf{photon}{w2,w4}
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\end{fmfgraph*}
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\end{fmffile}
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\end{document} |