Fig. 22.

Comparison of 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} differential jet shape data for 50 GeV<p _T<70 GeV with several MC event generators. As stated in the text, AcerMC [35] coupled to Pythia [33] with the A Pro and A CR Pro tunes [69, 70] give the best description of the data, while the Perugia 2011 [36] tunes are found to be slightly disfavoured. Alpgen+Jimmy [28, 39] provides an intermediate description.