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\subsection{Single Lepton Top MC Modelling Validation from CR2} |
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\label{sec:cr2} |
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|
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IS THIS GOING TO BE DONE WITH A BVETO OR NOT. IF SO, IS IT GOING TO |
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BE CSVL OR CSVM? NEED TO DISCUSS THIS. |
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|
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The \mt\ tail for single-lepton top events (\ttsl\ and single top) is dominated by jet resolution effects. The \W\ cannot be far off-shell because $\mW < \mtop$. |
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The modeling of the \mt\ tail from jet resolution effects is studied using \zjets\ data and MC samples. |
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\Z\ events are selection by requiring 2 good leptons (satisfying ID and isolation requirements) and requiring the \mll\ to be in the range $81-101$ GeV. |
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The modeling of the \mt\ tail from jet resolution effects is studied |
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using \zjets\ data and MC samples. |
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|
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\Z\ events are selected by requiring exactly 2 good leptons (satisfying ID |
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and isolation requirements) and requiring the \mll\ to be in the range |
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$81-101$ GeV. |
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Events with additional isolated tracks are vetoed, as in Section~\ref{sec:tkveto}. |
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To reduce \ttbar\ backgrounds, events with a CSVM tag %H |
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are removed. |
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The negative lepton is treated as a neutrino and so is added to the MET: \met\ $\rightarrow$ \pt(\Lepm) + \met, |
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and the \mt\ is recalculated with the positive lepton \mt(\Lepp, \met). |
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The resulting ``pseudo-\mt'' is dominated by jet resolution effects, since no off-shell |
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This section describes how well the MC predicts the tail of ``pseudo-\mt''. |
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|
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The underlying distributions are shown in Fig.~\ref{fig:cr2met} |
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and~\ref{fig:cr2mtrest}. The comparison of data and MC event counts |
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is shown in Table~\ref{tab:cr2yields}. From this table we extract |
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the data to MC scale factors $SFR^{e}_{top}$ and $SFR^{\mu}_{top}$. |
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and~\ref{fig:cr2mtrest}. Just as in CR1, there is an excess in the |
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tails, but there are insufficient events to derive scale factors. |
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% for $\met\ > 150$~GeV. |
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|
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|
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%We then perform the exact same type of Data/MC comparison and analysis as |
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%described for CR1 in Section~\ref{sec:cr1}. For CR1 we collected |
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%the data/MC tail information in |
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%Table~\ref{tab:cr1yields} ; the equivalent for CR2 is |
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%Table~\ref{tab:cr2yields} |
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%(for CR2 the statistics are not sufficient to split electrons and muons). |
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%The last line of Table~\ref{tab:cr2yields} gives the data/MC scale factor |
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%for the \ttbar\ lepton $+$ jets $M_T$ tail ($SFR_{top}$). This is |
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%calculated in the same way as $SFR_{wjets}$ of Table~\ref{tab:cr1yields}. |
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|
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|
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\begin{table}[!h] |
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\begin{tabular}{l||c|c||c|c|c|c|c} |
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\hline |
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Sample & CR2PRESEL0 &CR2PRESEL1 & CR2A & CR2B & CR2C & |
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CR2D & CR2E\\ |
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CR2D & CR2E \\ |
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\hline |
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\hline |
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MC & $36 \pm 2$ & $30 \pm 2$ & $18 \pm 1$ & $30 \pm 2$ & $13 \pm 1$ & $5 \pm 0$ & $2 \pm 0$ \\ |
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Data & $56$ & $43$ & $32$ & $40$ & $21$ & $12$ & $2$ \\ |
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\hline |
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Data/MC & $1.56 \pm 0.23$ & $1.44 \pm 0.24$ & $1.77 \pm 0.34$ & $1.32 \pm 0.22$ & $1.65 \pm 0.37$ & $2.65 \pm 0.79$ & $0.99 \pm 0.71$ \\ |
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\hline |
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\hline |
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DY MC & $26 \pm 2$ & $22 \pm 2$ & $15 \pm 2$ & $28 \pm 3$ & $10 \pm 2$ & $3 \pm 1$ & $1 \pm 1$ \\ |
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Data - non-DY MC & $47 \pm 8$ & $36 \pm 7$ & $28 \pm 6$ & $35 \pm 6$ & $19 \pm 5$ & $11 \pm 3$ & $1 \pm 1$ \\ |
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\hline |
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Data/MC SF & $1.77 \pm 0.31$ & $1.61 \pm 0.33$ & $1.91 \pm 0.45$ & $1.25 \pm 0.27$ & $1.93 \pm 0.60$ & $3.38 \pm 1.70$ & $1.30 \pm 1.56$ \\ |
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DY MC & $27 \pm 2$ & $23 \pm 2$ & $14 \pm 2$ & $25 \pm 3$ & $11 \pm 2$ & $3 \pm 1$ & $1 \pm 1$ \\ |
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DY Data & $47 \pm 8$ & $36 \pm 7$ & $28 \pm 6$ & $35 \pm 6$ & $19 \pm 5$ & $11 \pm 3$ & $1 \pm 1$ \\ |
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\hline |
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DY Data/MC & $1.75 \pm 0.31$ & $1.58 \pm 0.32$ & $2.00 \pm 0.47$ & $1.38 \pm 0.31$ & $1.78 \pm 0.56$ & $3.29 \pm 1.73$ & $0.98 \pm 1.20$ \\ |
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\hline |
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\hline |
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\hline |
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$SFR_{top}$ & $1.66 \pm 0.40$ & $1.51 \pm 0.35$ & $1.89 \pm 0.56$ & $1.35 \pm 0.28$ & $1.71 \pm 0.51$ & $2.97 \pm 1.26$ & $0.98 \pm 0.71$ \\ |
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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. CR2PRESEL 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. NEED TO ADD THE SYMBOLS |
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DEFINED IN THE TEXT FOR THESE SCALE FACTORS. IS THIS GOING TO BE |
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DONE SEPARATELY FOR MUONS AND ELECTRONS??? |
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MAYBE WANT TO REMOVE LAST ENTRIES WHERE STATS ARE VERY LOW |
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\caption{ Yields in \mt\ tail comparing the \zjets\ MC prediction (after |
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applying SFs) to data without subtracting the non-\zjets\ components (top table) and with subtracting the non-\zjets\ components (bottom table). |
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CR2PRESEL refers to a sample with $\met>50$ GeV and $\mt>150$ GeV. |
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\label{tab:cr2yields}} |
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\end{center} |
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\end{table} |
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|
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+ |
|
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\begin{figure}[hbt] |
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\begin{center} |
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% \includegraphics[width=0.5\linewidth]{plots/CR2plots/met_scaled_nj4_emucomb.pdf}% |
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\includegraphics[width=0.5\linewidth]{plots/CR2plots/mt_lepcor_scaled_met100_nj4_emucomb.pdf} |
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|
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\caption{ |
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Comparison of the pseudo\-\met\ (top, left), pseudo\-\mt\ (top, |
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Comparison of the pseudo-\met\ (top, left), pseudo-\mt\ (top, |
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right and bottom) distributions in data vs. MC for events |
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satisfying the requirements of CR2, combining both the muon and |
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electron channels. The pseudo\-\mt\ distributions are shown |
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electron channels. The pseudo-\mt\ distributions are shown |
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before any additional requirements (top, right) and after |
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requiring pseudo\-\met>50 GeV (bottom, left) and pseudo\-\met>100 GeV (bottom, right) . |
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requiring pseudo-\met $>$50 GeV (bottom, left) and pseudo-\met |
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$>$ 100 GeV (bottom, right) . |
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\label{fig:cr2met} |
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} |
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\end{center} |
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} |
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\end{center} |
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\end{figure} |
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\clearpage |
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\clearpage |
