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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 34.85 pb$^{-1}$ using the cross-sections
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from Reference~\cite{ref:xsec}.
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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 (34.85~pb$^{-1}$) for the preselection.
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($t\bar{t}\rightarrow \ell^{+}\ell^{-}$corrresponds to dileptonic $t\bar{t}$ including
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$t \to W \to \tau \to \ell$,
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$t\bar{t}\rightarrow \mathrm{other}$ are all other $t\bar{t}$ modes).}
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\begin{tabular}{ccccc}
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\hline
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Sample & $ee$ & $\mu\mu$ & $e\mu$ & tot \\
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\hline
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$t\bar{t}\rightarrow \ell^{+}\ell^{-}$ & 14.85 $\pm$ 0.23 & 17.61 $\pm$ 0.26 & 40.40 $\pm$ 0.39 & 72.85 $\pm$ 0.52 \\
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$t\bar{t}\rightarrow \mathrm{other}$ & 0.53 $\pm$ 0.04 & 0.24 $\pm$ 0.03 & 0.96 $\pm$ 0.06 & 1.74 $\pm$ 0.08 \\
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$Z^0$ + jets & 0.77 $\pm$ 0.24 & 1.00 $\pm$ 0.28 & 0.69 $\pm$ 0.23 & 2.47 $\pm$ 0.44 \\
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$W^{\pm}$ + jets & 0.19 $\pm$ 0.14 & 0.00 $\pm$ 0.00 & 0.10 $\pm$ 0.10 & 0.29 $\pm$ 0.17 \\
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$W^+W^-$ & 0.17 $\pm$ 0.05 & 0.21 $\pm$ 0.05 & 0.41 $\pm$ 0.07 & 0.79 $\pm$ 0.10 \\
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$W^{\pm}Z^0$ & 0.04 $\pm$ 0.02 & 0.03 $\pm$ 0.01 & 0.05 $\pm$ 0.02 & 0.13 $\pm$ 0.03 \\
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$Z^0Z^0$ & 0.02 $\pm$ 0.00 & 0.01 $\pm$ 0.00 & 0.02 $\pm$ 0.01 & 0.04 $\pm$ 0.01 \\
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single top & 0.47 $\pm$ 0.02 & 0.51 $\pm$ 0.02 & 1.15 $\pm$ 0.03 & 2.14 $\pm$ 0.04 \\
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\hline
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total SM MC & 17.04 $\pm$ 0.37 & 19.62 $\pm$ 0.38 & 43.79 $\pm$ 0.47 & 80.45 $\pm$ 0.71 \\
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\hline
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data & 18 & 23 & 45 & 86 \\
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\hline
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LM0 & 8.15 $\pm$ 0.23 & 9.34 $\pm$ 0.25 & 12.64 $\pm$ 0.29 & 30.12 $\pm$ 0.44 \\
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LM1 & 1.81 $\pm$ 0.04 & 2.04 $\pm$ 0.04 & 1.03 $\pm$ 0.03 & 4.89 $\pm$ 0.06 \\
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\hline
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\end{tabular}
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\end{center}
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\end{table}
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