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% arara: indent: {overwrite: true, silent: on}
\documentclass[11pt]{article}
\usepackage{tikz}
\usetikzlibrary{trees}
\usetikzlibrary{decorations.pathmorphing}
\usetikzlibrary{decorations.markings}
\begin{document}
\tikzset{
photon/.style={decorate, decoration={snake}, draw=red},
particle/.style={draw=blue, postaction={decorate},
decoration={markings,mark=at position .5 with {\arrow[draw=blue]{>}}}},
antiparticle/.style={draw=blue, postaction={decorate},
decoration={markings,mark=at position .5 with {\arrow[draw=blue]{<}}}},
gluon/.style={decorate, draw=black,
decoration={coil,amplitude=4pt, segment length=5pt}}
}
\begin{tikzpicture}[
thick,
% Set the overall layout of the tree
level/.style={level distance=1.5cm},
level 2/.style={sibling distance=3.5cm},
]
\coordinate
child[grow=down]{
edge from parent [antiparticle]
child {
node{$E$}
edge from parent [particle]
}
child {
node{$D$}
edge from parent [gluon]
}
node [above=3pt] {$C$}
}
% I have to insert a dummy child to get the tree to grow
% correctly to the right.
child[grow=right, level distance=0pt] {
child {
node{$A$}
edge from parent [gluon]
}
child {
node{$B$}
edge from parent [particle]
}
};
\end{tikzpicture}
\end{document}
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