| 7 |
|
Dilepton \ttbar\ events have 2 jets from the top decays, so additional |
| 8 |
|
jets from radiation or higher order contributions are required to |
| 9 |
|
enter the signal sample. In this Section we develop an algorithm |
| 10 |
< |
to be applied to all \ttll\ MC samples to insure that the distribution |
| 10 |
> |
to be applied to all \ttll\ MC samples to ensure that the distribution |
| 11 |
|
of extra jets is properly modelled. |
| 12 |
|
|
| 13 |
|
|
| 136 |
|
|
| 137 |
|
Table~\ref{tab:njetskfactors} also shows the values of $K_3$ and $K_4$ when the \met\ cut in the control sample definition is changed from 50 GeV to 100 GeV and 150 GeV. |
| 138 |
|
% These values of $K_3$ and $K_4$ are not used in the analysis, but |
| 139 |
< |
This demonstrate that there is no statistically significant dependence of $K_3$ and $K_4$ on the \met\ cut. |
| 139 |
> |
This demonstrates that there is no statistically significant dependence of $K_3$ and $K_4$ on the \met\ cut. |
| 140 |
|
|
| 141 |
|
|
| 142 |
|
The factors $K_3$ and $K_4$ (derived with the 100 GeV \met\ cut) are applied to the \ttll\ MC throughout the |
| 156 |
|
|
| 157 |
|
\begin{table}[!ht] |
| 158 |
|
\begin{center} |
| 159 |
+ |
{\footnotesize |
| 160 |
|
\begin{tabular}{l|c|c|c} |
| 161 |
|
\cline{2-4} |
| 162 |
|
& \multicolumn{3}{c}{ \met\ cut for data/MC scale factors} \\ |
| 169 |
|
N jets $\ge4$ (sensitive to $\ttbar+\ge2$ extra jets from radiation) |
| 170 |
|
& $K_4 = 0.94 \pm 0.02$ & $K_4 = 0.93 \pm 0.04$ & $K_4 = 1.00 \pm 0.08$ \\ |
| 171 |
|
\hline |
| 172 |
< |
\end{tabular} |
| 172 |
> |
\end{tabular}} |
| 173 |
|
\caption{Data/MC scale factors used to account for differences in the |
| 174 |
|
fraction of events with additional hard jets from radiation in |
| 175 |
|
\ttll\ events. The values derived with the 100 GeV \met\ cut are applied |
| 196 |
|
|
| 197 |
|
The $t\bar{t}$ MC is corrected using the $K_3$ and $K_4$ factors |
| 198 |
|
from Section~\ref{sec:jetmultiplicity}. It is also normalized to the |
| 199 |
< |
total data yield separately for the \met\ requirements of signal |
| 200 |
< |
regions A, B, C, and D. These normalization factors are listed |
| 199 |
> |
total data yield separately for the \met\ requirements of the various signal |
| 200 |
> |
regions. These normalization factors are listed |
| 201 |
|
in Table~\ref{tab:cr4mtsf} and are close to unity. |
| 202 |
|
|
| 203 |
|
The underlying \met\ and $M_T$ distributions are shown in |
