| 1 |
%\section{Preselection yields}
|
| 2 |
%\label{sec:yields}
|
| 3 |
|
| 4 |
The data yields and corresponding MC predictions after this event preselection
|
| 5 |
are given in Table~\ref{tab:yields}. The MC yields are normalized to~\lumifinal\ using
|
| 6 |
next-to-leading order (NLO) cross sections. At the current LHC luminosity, the mean
|
| 7 |
number of expected pile-up interactions is approximately 5. In the MC, pile-up interactions
|
| 8 |
are superimposed on the hard collision, and the MC is reweighted such that the distribution
|
| 9 |
of reconstructed primary vertices matches that in data. As expected, the MC predicts that the
|
| 10 |
sample passing the preselection is dominated by dilepton $t\bar{t}$. The data yield is in
|
| 11 |
reasonable agreement with the prediction. We also quote the yields for
|
| 12 |
the LM1 and LM3 benchmark scenarios.
|
| 13 |
|
| 14 |
\begin{table}[htb]
|
| 15 |
\begin{center}
|
| 16 |
\caption{\label{tab:yields} Data yields and MC predictions after preselection, using the quoted NLO production cross sections $\sigma$.
|
| 17 |
The \ttll\ corrresponds to dilepton $t\bar{t}$, including
|
| 18 |
$t \to W \to \ell$; \tttau\ corresponds to dilepton $t\bar{t}$ in which at least 1 $W$ decays via
|
| 19 |
$t \to W \to \tau \to \ell$; \ttfake\ includes all other $t\bar{t}$ decay modes.
|
| 20 |
The samples of MC $t\bar{t}$, $W^{\pm}$ + jets, and single-top events were
|
| 21 |
generated with \MADGRAPH. The Drell--Yan sample (which includes events with
|
| 22 |
invariant masses as low as 10\GeVcc) was generated using a mixture of \MADGRAPH\ and
|
| 23 |
\PYTHIA and contains decays to the $\tau^+\tau^-$ final state. All other samples were generated with \PYTHIA.
|
| 24 |
The LM0 and LM1 benchmark scenarios are defined in the text; the quoted $\sigma$ values refer to the total production
|
| 25 |
cross section for SUSY particles in these scenarios. Uncertainties are statistical only.
|
| 26 |
}
|
| 27 |
\vspace{2 mm}
|
| 28 |
\begin{tabular}{lr|cccc}
|
| 29 |
\hline
|
| 30 |
Sample & $\sigma$ & $ee$ & $\mu\mu$ & $e\mu$ & total \\
|
| 31 |
\hline
|
| 32 |
\ttll & X & 120.1 $\pm$ 2.9 &133.1 $\pm$ 2.9 &320.3 $\pm$ 4.6 &573.5 $\pm$ 6.1 \\
|
| 33 |
\tttau & X & 27.5 $\pm$ 1.4 & 33.3 $\pm$ 1.4 & 71.5 $\pm$ 2.2 &132.3 $\pm$ 3.0 \\
|
| 34 |
\ttfake & 140.6 & 4.5 $\pm$ 0.6 & 1.3 $\pm$ 0.3 & 8.1 $\pm$ 0.7 & 13.9 $\pm$ 1.0 \\
|
| 35 |
DY & 18417 & 6.6 $\pm$ 1.8 & 9.5 $\pm$ 2.1 & 13.4 $\pm$ 2.6 & 29.6 $\pm$ 3.8 \\
|
| 36 |
\WW & 2.9 & 1.4 $\pm$ 0.2 & 1.5 $\pm$ 0.2 & 3.4 $\pm$ 0.2 & 6.3 $\pm$ 0.3 \\
|
| 37 |
\WZ & 0.3 & 0.3 $\pm$ 0.0 & 0.4 $\pm$ 0.0 & 0.7 $\pm$ 0.1 & 1.3 $\pm$ 0.1 \\
|
| 38 |
\ZZ & 4.3 & 0.1 $\pm$ 0.0 & 0.1 $\pm$ 0.0 & 0.2 $\pm$ 0.0 & 0.4 $\pm$ 0.0 \\
|
| 39 |
single top & 33 & 4.5 $\pm$ 0.2 & 5.0 $\pm$ 0.2 & 11.9 $\pm$ 0.3 & 21.4 $\pm$ 0.5 \\
|
| 40 |
\wjets & 28049 & 4.5 $\pm$ 1.9 & 0.0 $\pm$ 0.0 & 2.8 $\pm$ 1.7 & 7.3 $\pm$ 2.6 \\
|
| 41 |
\hline
|
| 42 |
total SM MC & & 169.7 $\pm$ 4.2 &184.3 $\pm$ 3.9 &432.2 $\pm$ 6.0 &786.1 $\pm$ 8.3 \\
|
| 43 |
\hline
|
| 44 |
data & & 193 & 201 & 485 & 879 \\
|
| 45 |
\hline
|
| 46 |
LM1 & 6.7 & 22.3 $\pm$ 0.6 & 24.8 $\pm$ 0.6 & 12.8 $\pm$ 0.4 & 59.9 $\pm$ 0.9 \\
|
| 47 |
LM3 & X & 5.2 $\pm$ 0.2 & 6.3 $\pm$ 0.2 & 9.0 $\pm$ 0.2 & 20.4 $\pm$ 0.4 \\
|
| 48 |
\hline
|
| 49 |
\end{tabular}
|
| 50 |
\end{center}
|
| 51 |
\end{table}
|
| 52 |
|
