ggH.tex

\documentclass{article}
\usepackage{feynmp}
\usepackage{color}
\pagestyle{empty} %Takes away pagenumbers etc.
\begin{document}

\unitlength = 1mm

\begin{fmffile}{ggH_diag}
\begin{fmfchar*}(90,50)\fmfpen{thick}
\unitlength = 1mm
\fmfset{arrow_ang}{13} %il default dello spessore delle frecce è 15 ma è troppo grosso

\fmfleft{i1,i2}
\fmfright{o1,o2,o3}
\fmf{phantom}{i1,v1,o1}
\fmf{phantom}{i2,v2,o3}
\fmf{gluon, label={\Large $g$}, label.dist=+12.0}{i1,v1}
\fmf{gluon, label={\Large $g$}, label.dist=+12.0}{i2,v2}
\fmf{fermion, label={\Large $t$}, label.dist=-12.0,label.side=right}{v1,v2,v3,v1}
\fmf{scalar, label={\Large $H$}}{v3,o2}
\fmffreeze

\fmfforce{0.1w,.1h}{i1}
\fmfforce{0.1w,.9h}{i2}

\end{fmfchar*}
\end{fmffile}

\end{document}