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tikz-feyn.tex
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tikz-feyn.tex
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\documentclass{article}
\usepackage{tikz-feyn}
\usepackage{lipsum}
\begin{document}
\begin{tfeyn}[1cm][1cm]
\tfcol{i1, i2}[1cm]
\tfcol(0,0.25cm){v1, v2}[0.5cm]
\tfcol(0,-0.5cm){o1, o2}[1.5cm]
\tf[fermion]{i1,v1,o2}
\tf[fermion]{i2,v2,o1}
\tf[photon]{v1,v2}
\end{tfeyn}
\begin{tfeyn}[]
\def\colsep{1cm}
\let\lastvertex\undefined
\tfcol{i1, i2}[1cm]
\tfcol(0, 0.3cm){v1, v2}[0.3cm]
\tfcol(0, -0.3cm){o1, o2}[1cm]
%\tfcol(0,0.25cm){v1, v2}[0.5cm]
%\tfcol(0,-0.5cm){o1, o2}[1.5cm]
\tf[f]{i2,v4,v2}
\tf[f]{v2,v6,o2}
\tf[p,l]{v4,v6}
\tf[p]{v2,v1}
\tf[f]{i1,v1,o1}
%\tf[fermion]{i2,v2,o1}
%\tf[photon]{v1,v2}
\end{tfeyn}
\begin{tfeyn}[]
\def\colsep{1cm}
\let\lastvertex\undefined
\tfcol{i}[1cm]
\tfcol{o}
\tf[p]{i,o}
\tf[f,l]{i,o}
\tf[f,l]{o,i}
\end{tfeyn}
\begin{tfeyn}[]
%\def\colsep{1cm}
\let\lastvertex\undefined
\tfcol{i}[1cm]
\tfcol{o}
\tf[p,l, looseness=1]{i,o}
\tf[p,l, looseness=1]{o,i}
\tf[f,l]{i,o}
\tf[f,l]{o,i}
\end{tfeyn}
\begin{tfeyn}[1cm]
\let\lastvertex\undefined
\tfcol{i1, i2}[1cm]
\tfcol(0, 0.3cm){v1, v2}[0.3cm]
\tfcol(0, -0.3cm){o1, o2}[1cm]
%\tfcol(0,0.25cm){v1, v2}[0.5cm]
%\tfcol(0,-0.5cm){o1, o2}[1.5cm]
\tf[f]{i2,v4,v2}
\tf[f]{v2,v6,o2}
\tf[p,l]{v4,v6}
\tf[p]{v2,v1}
\tf[f]{i1,v1,o1}
%\tf[fermion]{i2,v2,o1}
%\tf[photon]{v1,v2}
\end{tfeyn}
\begin{tfeyn}
\tfcol{a1, a2}
\tfcol{b1, b2}
\tf[f]{a1,c1,a2}[r]
\tf[f]{b1,c3,b2}[l]
\tf[p]{c1, c3}
%\draw [red] (c2.center)to (c2.south east) to [loop] (c2.south west) to (c2.center);
\end{tfeyn}
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\begin{tfeynin}
\tfcol{a1, a2}
\tfcol{b1, b2}
\tf[f]{a1,d1,a2}[r]
\tf[f]{b1,c2,b2}[l]
\tf[p]{d1,c2}
\end{tfeynin}
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\end{document}