\documentclass{article}
\usepackage{axodraw2}
\begin{document}
Example of Feynman graph made by axodraw2:
\begin{center}
\begin{axopicture}(200,110)
\SetColor{Red}
\Arc[arrow](100,50)(40,0,180)
\Text(100,100)[]{$\alpha P_1 + \beta P_2 + k_\perp$}
\SetColor{Black}
\Arc[arrow](100,50)(40,180,360)
\Gluon(0,50)(60,50){5}{4}
\Vertex(60,50){2}
\Gluon(140,50)(200,50){5}{4}
\Vertex(140,50){2}
\end{axopicture}
\end{center}
\end{document}
