Fig. 1.

Example LO Feynman diagrams for \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$gg\rightarrow t\bar{t}$\end{document} in the dilepton (left) and single-lepton (right) decay modes