Table 2.

Systematic uncertainties on the \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$t\bar {t}$\end{document} cross section

Source of uncertainty	Relative uncertainty
ISR/FSR	15 %
Event generator	11 %
Hadronisation model	6 %
PDFs	2 %
Pile-up	1 %
b-jet tagging efficiency	9 %
Jet energy scale	5 %
\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$E_{\mathrm {T}}^{\mathrm {miss}}$\end{document} significance mismodelling	5 %
b-jet trigger efficiency	3 %
Jet energy resolution	2 %
Fit systematic uncertainties	4 %
Luminosity	4 %
Total uncertainty	24 %