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28 lines
439 B
TeX
28 lines
439 B
TeX
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\documentclass[a4paper]{article}
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\usepackage{feynmp}
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\begin{document}
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\setlength{\unitlength}{1mm}
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\begin{fmffile}{diagram}
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\begin{center}
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\begin{fmfgraph*}(41,17)
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\fmfleftn{i}{2}
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\fmfrightn{o}{2}
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\fmflabel{$g_2$}{i1}
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\fmflabel{$g_1$}{i2}
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\fmflabel{$p_2$}{o1}
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\fmflabel{$p_1$}{o2}
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\fmf{quark}{i1,v1}
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\fmf{quark}{i2,v1}
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\fmfblob{.35w}{v1}
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\fmf{quark}{v1,o1}
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\fmf{quark}{v1,o2}
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\end{fmfgraph*}
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\end{center}
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\end{fmffile}
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\end{document}
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