In general, when QCD and EW corrections are simultaneously enhanced, the \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\mathcal {O}(\alpha \alpha _{\mathrm {S}})$$\end{document} O ( α α S ) mixed terms that are controlled by the multiplicative prescription can become quite significant.
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