LaTex 双栏模板下单栏公式

Elsevier 双栏模板下的长公式

\documentclass[5p,preprint,12pt]{elsarticle}
\usepackage{amsmath}
\usepackage{mathtools, cuted}
\usepackage[english]{babel}
\usepackage{lipsum}
\begin{document}\lipsum[1-2]
\begin{strip}
\begin{equation}
\sum_{q_\mathrm{tot}=0}^{Q_A+Q_B-2}\sum_{q_A=0}^{q_\mathrm{tot}}{\textstyle\binom{Q_A-1}{q_A}\binom{Q_B-1}{q_B}}x^{q_\mathrm{tot}},
\end{equation}
\end{strip}
\lipsum[1-3]\end{document}

原文：long equation across whole page in two-column document

\documentclass{article}
\usepackage[margin=3cm]{geometry}
\usepackage{lipsum,amsmath,multicol}
\begin{document}\begin{multicols}{2}
\lipsum[1-3]
\end{multicols}
\par\noindent\rule{\dimexpr(0.5\textwidth-0.5\columnsep-0.4pt)}{0.4pt}%
\rule{0.4pt}{6pt}\begin{equation}
\mathcal{R}^{(\text{d})}=g_{\sigma_2}^e\left(\frac{[\Gamma^Z(3,21)]_{\sigma_1}}{Q_{12}^2-M_W^2}+\frac{[\Gamma^Z(13,2)]_{\sigma_1}}{Q_{13}^2-M_W^2}\right)+ x_WQ_e\left(\frac{[\Gamma^\gamma(3,21)]_{\sigma_1}}{Q_{12}^2-M_W^2}+\frac{[\Gamma^\gamma(13,2)]_{\sigma_1}}{Q_{13}^2-M_W^2}\right)\;. \label{eq:wideeq}
\end{equation}\vspace{\belowdisplayskip}\hfill\rule[-6pt]{0.4pt}{6.4pt}%
\rule{\dimexpr(0.5\textwidth-0.5\columnsep-1pt)}{0.4pt}
\begin{multicols}{2}
\lipsum[4-5]
\end{multicols}\end{document}

参考资料

（1）LaTeX双栏模板插入通栏公式（跨栏插图）

（2）cuted – Mixing onecolumn and twocolumn modes