% 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}