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\subsection{W+Jets MC Modelling Validation from CR1}
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\label{sec:cr1}
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The estimate of the uncertainty on this background is based on CR1,
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defined by applying the full signal selection, but requiring 0 b-tags.
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SPECIFY THE EXACT REQUIREMENT FOR THE BVETO AND SAY WHETHER THERE IS
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AN ISOLATED TRACK VETO.
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The sample is dominanted by \wjets\ and is thus used to validate the MC modelling of this background.
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In Table~\ref{tab:cr1mtsf} we show the amount that we need to scale the Wjets MC
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by in order to have agreement between data and Monte Carlo in the $M_T$ peak
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region, defined as $XX < M_T < YY$ GeV. These scale factors are not terribly
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important, but it is reassuring that they are not too different from 1. (ARE THESE
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SCALED FOR TRIGGER EFFICIENCY???)
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\begin{table}[!h]
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\begin{center}
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\begin{tabular}{l||c||c|c|c|c}
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\hline
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Sample & CR1PRESEL & CR1A & CR1B & CR1C & CR1D \\
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\hline
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\hline
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Muon \mt-SF & $0.91 \pm 0.03$ & $0.96 \pm 0.07$ & $0.88 \pm 0.11$ & $1.05 \pm 0.21$ & $1.27 \pm 0.41$ \\
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\hline
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\hline
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Electron \mt-SF & $0.82 \pm 0.03$ & $0.86 \pm 0.06$ & $1.09 \pm 0.15$ & $1.24 \pm 0.30$ & $1.11 \pm 0.40$ \\
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\hline
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\end{tabular}
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\caption{ \mt\ peak Data/MC scale factors applied to the single lepton
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samples and \ttdl. The raw MC is used for backgrounds from rare
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processes. CR1PRESEL refers to a sample with $\met>50$ GeV.
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The uncertainties are statistical only.
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\label{tab:cr1mtsf}}
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\end{center}
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\end{table}
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In Table~\ref{tab:cr1yields} we compare the data and MC yields in the four $M_T$ signal regions
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and in a looser control region. We also derive the data/MC scale factors
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$SFR^{e}_{wjet}$ and $SFR^{\mu}_{wjet}$. The underlying \met\ and $M_T$ distributions
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are shown in Fig.~\ref{fig:cr1met} and~\ref{fig:cr1mtrest}
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\begin{table}[!h]
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\begin{center}
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\begin{tabular}{l||c||c|c|c|c}
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\hline
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Sample & CR1PRESEL & CR1A & CR1B & CR1C & CR1D \\
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\hline
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\hline
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Muon MC & $456 \pm 73$ & $174 \pm 44$ & $51 \pm 7$ & $18 \pm 2$ & $10 \pm 2$ \\
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Muon Data & $657$ & $246$ & $142$ & $43$ & $12$ \\
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\hline
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Muon Data/MC SF: ($SFR^{\mu}_{wjet}$) & $1.44 \pm 0.24$ & $1.41 \pm 0.37$ & $2.80 \pm 0.47$ & $2.37 \pm 0.46$ & $1.23 \pm 0.42$ \\
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\hline
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\hline
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Electron MC & $396 \pm 64$ & $147 \pm 36$ & $54 \pm 4$ & $19 \pm 2$ & $8 \pm 2$ \\
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Electron Data & $702$ & $223$ & $144$ & $50$ & $23$ \\
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\hline
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Electron Data/MC SF: ($SFR^e_{wjet}$) & $1.77 \pm 0.29$ & $1.52 \pm 0.39$ & $2.68 \pm 0.30$ & $2.57 \pm 0.49$ & $2.73 \pm 0.76$ \\
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\hline
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\end{tabular}
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\caption{ Yields in \mt\ tail comparing the MC prediction (after
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applying SFs) to data. CR1PRESEL refers to a sample with $\met>50$
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GeV and $\mt>150$ GeV.
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The uncertainties are statistical only. VERENA MAKE SURE YOU ADD SCALE FACTOR SYMBOLS TO THIS TABLE.
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\label{tab:cr1yields}}
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\end{center}
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\end{table}
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\begin{figure}[hbt]
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\begin{center}
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\includegraphics[width=0.5\linewidth]{plots/CR1plots/met_met50_leadmuo_nj4.pdf}%
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\includegraphics[width=0.5\linewidth]{plots/CR1plots/met_met50_leadele_nj4.pdf}
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\includegraphics[width=0.5\linewidth]{plots/CR1plots/mt_met100_leadmuo_nj4.pdf}%
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\includegraphics[width=0.5\linewidth]{plots/CR1plots/mt_met100_leadele_nj4.pdf}
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\caption{
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Comparison of the \met\ (top) and \mt\ for $\met>100$ (bottom) distributions in data vs. MC for events
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with a leading muon (left) and leading electron (right)
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satisfying the requirements of CR1.
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\label{fig:cr1met}
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}
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\end{center}
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\end{figure}
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\begin{figure}[hbt]
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\begin{center}
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\includegraphics[width=0.5\linewidth]{plots/CR1plots/mt_met150_leadmuo_nj4.pdf}%
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\includegraphics[width=0.5\linewidth]{plots/CR1plots/mt_met150_leadele_nj4.pdf}
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\includegraphics[width=0.5\linewidth]{plots/CR1plots/mt_met200_leadmuo_nj4.pdf}%
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\includegraphics[width=0.5\linewidth]{plots/CR1plots/mt_met200_leadele_nj4.pdf}
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\includegraphics[width=0.5\linewidth]{plots/CR1plots/mt_met250_leadmuo_nj4.pdf}%
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\includegraphics[width=0.5\linewidth]{plots/CR1plots/mt_met250_leadele_nj4.pdf}
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\caption{
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Comparison of the \mt\ distribution in data vs. MC for events
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with a leading muon (left) and leading electron (right)
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satisfying the requirements of CR1. The \met\ requirements used are
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150 GeV (top), 200 GeV (middle) and 250 GeV (bottom).
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\label{fig:cr1mtrest}
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}
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\end{center}
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\end{figure}
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\clearpage |
