
%%%%%%%%%%%%%%%%%%%%%% Feynman diagram for TChiHZ

\documentclass[border={20pt 20pt 20pt 20pt}]{standalone}
\usepackage{feynmp}
\DeclareGraphicsRule{*}{mps}{*}{} % for being able to read the produced file

\usepackage{xcolor}

%%%%%%%%%%%%%%%%%%%%%%%%%%% Document %%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{document}
\thispagestyle{empty}

\Large
%%%%%%%% THE NAME OF THE fmffile HAS TO BE ``Feynman<filename>'' TO USE compile.py %%%%%%%%%%%%%%%
\begin{fmffile}{feyngraph}
  \begin{fmfgraph*}(250,100)
    \fmfleft{i1,i2}
    \fmfright{o1,o3,o2,o4}

    % gluons
    %% \fmf{phantom}{i1,v1,o1}
    %% \fmf{phantom}{i2,v3,v2,v4,o3}
    %% \fmf{phantom}{i2,v3,o4}
    %% \fmffreeze
    
    \fmf{gluon,fore=red}{i2,v3}
    \fmf{fermion}{i1,v1,o1}
    \fmf{fermion,fore=red}{v3,o4}
    \fmf{fermion,fore=red}{v3,w1}
    \fmf{fermion}{w1,v2,v4,o3}
    \fmf{photon,label=W,tension=0.5}{v1,v2}

    \fmf{dashes,tension=0}{v4,o2}

    % labels
    \fmflabel{\textcolor{red}{b}}{o4}
    \fmflabel{\textcolor{red}{g}}{i2}
    \fmflabel{q}{i1}
    \fmflabel{q$'$}{o1}
    \fmflabel{H}{o2}
    \fmflabel{t}{o3}
  \end{fmfgraph*}
\end{fmffile}

\end{document}
