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\section{Preselection yields}
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\label{sec:yields}
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The data yields and the MC predictions are given in Table~\ref{tab:yields}.
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The MC yields are normalized to 30 pb$^{-1}$ using the cross-sections
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from Reference~\cite{ref:xsec} assuming 100\% trigger efficiency {\color{red}
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(will have to fix this eventually)}. As anticipated, the MC predicts
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that the preselection is dominated by $t\bar{t}$. The data yield is
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in good agreement with the prediction.
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\begin{table}[htb]
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\begin{center}
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\caption{\label{tab:yields} Data and Monte Carlo yields for the preselection.
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(ttdil refers to dileptonic $t\bar{t}$ including $t \to W \to \ell$,
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ttothr are all other $t\bar{t}$ modes).}
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\begin{tabular}{|c|c|c|c|c|}
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\hline
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Sample & ee & $\mu\mu$ & $e\mu$ & total \\ \hline
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ttdil & 12.8 & 15.3 & 34.9 & 63.0 \\
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ttothr & 0.5 & 0.2 & 0.8 & 1.5 \\
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Zjets & 0.7 & 1.4 & 0.6 & 2.7 \\
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Wjets & 0.17 & 0.00 & 0.08 & 0.25 \\
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$WW$ & 0.15 & 0.19 & 0.36 & 0.69 \\
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$WZ$ & 0.04 & 0.04 & 0.06 & 0.15 \\
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$ZZ$ & 0.01 & 0.01 & 0.02 & 0.05 \\
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$tW$ & 0.39 & 0.45 & 0.97 & 1.81 \\
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\hline
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total SM MC (30 pb$^{-1}$) & 14.7 & 17.6 & 37.8 & 70.1 \\ \hline
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data (11.1 pb$^{-1}$) & 7 & 7 & 10 & 24 \\ \hline
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\end{tabular}
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\end{center}
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\end{table}
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