Separation of the Process \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\boldsymbol{e}^{\mathbf{+}}\boldsymbol{e}^{\mathbf{-}}\boldsymbol{\to}\boldsymbol{n}\bar{\boldsymbol{n}}$$\end{document} by Means of time Measurements in the Caloriment