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%\section{Preselection yields}
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%\label{sec:yields}
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The data yields and corresponding MC predictions after this event preselection
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are given in Table~\ref{tab:yields}. The MC yields are normalized to~\lumifinal\ using
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next-to-leading order (NLO) cross sections. At the current LHC luminosity, the mean
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number of interactions in a single beam crossing is approximately 5. In the MC, multiple interactions
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are superimposed on the hard collision, and the MC is reweighted such that the distribution
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of reconstructed primary vertices matches that in data. As expected, the MC predicts that the
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sample passing the preselection is dominated by dilepton $t\bar{t}$. The data yield is in
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reasonable agreement~\footnote{The luminosity is currently underestimated by approximately 10\%,
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which explains the observed excess in data. The estimate will be updated before EPS.}
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with the prediction. We also quote the yields for
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the LM1 and LM3 benchmark scenarios.
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\begin{table}[htb]
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\begin{center}
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\caption{\label{tab:yields} Data yields and MC predictions after preselection, using the quoted NLO production cross sections $\sigma$.
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The \ttll\ corrresponds to dilepton $t\bar{t}$, including
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$t \to W \to \tau \to \ell$; \ttfake\ includes all other $t\bar{t}$ decay modes.
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The samples of MC $t\bar{t}$, $W^{\pm}$ + jets, and single-top events were
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generated with \MADGRAPH. The Drell--Yan sample (which includes events with
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invariant masses as low as 10\GeVcc) was generated using a mixture of \MADGRAPH\ and
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\PYTHIA and includes decays to the $\tau^+\tau^-$ final state. All other samples were generated with \PYTHIA.
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The LM1 and LM3 benchmark scenarios are defined in the text; the quoted $\sigma$ values refer to the total production
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cross section for SUSY particles in these scenarios. Uncertainties are statistical only.
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}
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\vspace{2 mm}
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\begin{tabular}{lr|cccc}
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\hline
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Sample & $\sigma$ [pb] & $ee$ & $\mu\mu$ & $e\mu$ & total \\
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\hline
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\ttll & 17 & 147.6 $\pm$ 3.2 &166.4 $\pm$ 3.2 &391.7 $\pm$ 5.1 &705.8 $\pm$ 6.8 \\
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\ttfake & 141 & 4.5 $\pm$ 0.6 & 1.3 $\pm$ 0.3 & 8.1 $\pm$ 0.7 & 13.9 $\pm$ 1.0 \\
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DY$\to\ell^+\ell^-$ & 16677 & 6.6 $\pm$ 1.8 & 9.5 $\pm$ 2.1 & 13.4 $\pm$ 2.6 & 29.6 $\pm$ 3.8 \\
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\WW & 43 & 1.4 $\pm$ 0.2 & 1.5 $\pm$ 0.2 & 3.4 $\pm$ 0.2 & 6.3 $\pm$ 0.3 \\
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\WZ & 18 & 0.3 $\pm$ 0.0 & 0.4 $\pm$ 0.0 & 0.7 $\pm$ 0.1 & 1.3 $\pm$ 0.1 \\
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\ZZ & 5.9 & 0.1 $\pm$ 0.0 & 0.1 $\pm$ 0.0 & 0.2 $\pm$ 0.0 & 0.4 $\pm$ 0.0 \\
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single top & 102 & 4.5 $\pm$ 0.2 & 5.0 $\pm$ 0.2 & 11.9 $\pm$ 0.3 & 21.4 $\pm$ 0.5 \\
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\wjets & 96648 & 4.5 $\pm$ 1.9 & 0.0 $\pm$ 0.0 & 2.8 $\pm$ 1.7 & 7.3 $\pm$ 2.6 \\
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\hline
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total SM MC & & 169.7 $\pm$ 4.2 &184.3 $\pm$ 3.9 &432.2 $\pm$ 6.0 &786.1 $\pm$ 8.3 \\
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\hline
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data & & 193 & 201 & 485 & 879 \\
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\hline
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LM1 & 6.7 & 22.3 $\pm$ 0.6 & 24.8 $\pm$ 0.6 & 12.8 $\pm$ 0.4 & 59.9 $\pm$ 0.9 \\
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LM3 & 5.3 & 7.9 $\pm$ 0.3 & 9.6 $\pm$ 0.3 & 14.2 $\pm$ 0.4 & 31.7 $\pm$ 0.6 \\
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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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