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\end{center} |
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\end{figure} |
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|
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\clearpage |
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\subsubsection{Check of the impact of Signal Contamination} |
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|
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We examine the contribution of possible signal events in the \ttll\ |
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control regions (CR4 and CR5). It should be emphasized that these |
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regions are not used to apply data/MC SFs. They are used to quantify |
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the level of data/MC agreement and assign a corresponding uncertainty. |
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|
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To illustrate how much signal is expected to populate these control |
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regions, we examine signal points near the edge of the analysis' |
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sensitivity (m(stop) = 450 m($\chi^0$) = 0 for T2tt, m(stop) = 450 |
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m($\chi^0$) = 0 for T2bw with x=0.75 and m(stop) = 350 |
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m($\chi^0$) = 0 for T2bw with x=0.5). |
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Table~\ref{tab:signalcontamination} compares the expected signal |
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yields and the raw total MC background prediction in the control |
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regions with the \met\ and \mt\ requirements corresponding to SRB, SRC |
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and SRD (these are the signal regions that dominate the |
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sensitivity). The signal contamination is smaller than the uncertainty |
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on the dilepton background and smaller than the signal/background in |
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the signal regions, with the exception of the T2bw scenario with x=0.5. |
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However, based on the fact that the CR4 and CR5 are not used to extract |
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data/MC SFs and that CR4 shows a slight deficit of data compared to |
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the MC prediction, indicating that we do not observe evidence of |
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signal contamination, we do not assign an additional uncertainty. |
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|
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\begin{table}[!h] |
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\begin{center} |
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{\small |
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\begin{tabular}{l l||c|c|c} |
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\hline |
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\multicolumn{2}{c||}{Sample} & CR B & CR C & CR D \\ |
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\hline |
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\hline |
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\multirow{4}{*}{CR4} & Raw MC & $168.2 \pm 4.5$& $51.5 \pm 2.5$& $19.6 \pm 1.5$ \\ |
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%\hline |
| 216 |
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& T2tt m(stop) = 450 m($\chi^0$) = 0 & $2.6 \pm 0.3$ $(2\%)$ & $2.0 \pm 0.2$ $(4\%)$ & $1.4 \pm 0.2$ $(7\%)$ \\ |
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& T2bw x=0.75 m(stop) = 450 m($\chi^0$) = 0 & $10.5 \pm 0.4$ $(6\%)$ &$6.1 \pm 0.3$ $(12\%)$ & $3.1 \pm 0.2$ $(16\%)$ \\ |
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& T2bw x=0.5 m(stop) = 350 m($\chi^0$) = 0 & $32.1 \pm 1.5$ $(19\%)$ & $14.7 \pm 1.0$ $(29\%)$ & $5.5 \pm 0.6$ $(28\%)$ \\ |
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\hline |
| 220 |
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\hline |
| 221 |
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\multirow{4}{*}{CR5} & Raw MC & $306.5 \pm 6.2$& $101.8 \pm 3.6$& $38.0 \pm 2.2$ \\ |
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%\hline |
| 223 |
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& T2tt m(stop) = 450 m($\chi^0$) = 0 & $10.6 \pm 0.6$ $(3\%)$ & $7.8 \pm 0.5$ $(8\%)$ & $5.4 \pm 0.4$ $(14\%)$ \\ |
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& T2bw x=0.75 m(stop) = 450 m($\chi^0$) = 0 & $17.3 \pm 0.5$ $(6\%)$ &$11.3 \pm 0.4$ $(11\%)$ & $6.2 \pm 0.3$ $(16\%)$\\ |
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& T2bw x=0.5 m(stop) = 350 m($\chi^0$) = 0 & $33.0 \pm 1.5$ $(11\%)$& $14.4 \pm 1.0$ $(14\%)$& $5.7 \pm 0.6$ $(15\%)$ \\ |
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\hline |
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\hline |
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\hline |
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\multirow{4}{*}{SIGNAL} & Raw MC & $486.3 \pm 7.8$& $164.3 \pm 4.5$& $61.5 \pm 2.8$ \\ |
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& T2tt m(stop) = 450 m($\chi^0$) = 0 & $65.3 \pm 1.4$ $(13\%)$& $48.8 \pm 1.2$ $(30\%)$& $32.9 \pm 1.0$ $(53\%)$ \\ |
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& T2bw x=0.75 m(stop) = 450 m($\chi^0$) = 0 & $69.3 \pm 1.0$ $(14\%)$& $47.3 \pm 0.8$ $(29\%)$& $27.3 \pm 0.6$ $(44\%)$ \\ |
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& T2bw x=0.5 m(stop) = 350 m($\chi^0$) = 0 & $105.5 \pm 2.8$ $(22\%)$& $44.6 \pm 1.8$ $(27\%)$& $15.9 \pm 1.1$ $(26\%)$ \\ |
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\hline |
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\end{tabular}} |
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\caption{ Yields in \mt\ tail comparing the raw SM MC prediction to the |
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yields for a few signal points on the edge of our sensitivity in the \ttll\ |
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control regions CR4, CR5 and in the corresponding signal region. |
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The numbers in parenthesis are the expected signal yield divided by |
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the total background. The uncertainties are statistical only. |
| 240 |
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\label{tab:signalcontamination}} |
| 241 |
+ |
\end{center} |
| 242 |
+ |
\end{table} |
| 243 |
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|
| 244 |
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%CR5 DUMP |
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%Total & $880.3 \pm 10.4$& $560.0 \pm 8.3$& $306.5 \pm 6.2$& $101.8 \pm 3.6$& $38.0 \pm 2.2$& $16.4 \pm 1.4$& $8.2 \pm 1.0$& $4.6 \pm 0.8$ \\ |
| 246 |
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%\hline |
| 247 |
+ |
%\hline |
| 248 |
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%Data & $941$& $559$& $287$& $95$& $26$& $8$& $5$& $3$ \\ |
| 249 |
+ |
%\hline |
| 250 |
+ |
%T2tt m(stop) = 250 m($\chi^0$) = 0 & $84.3 \pm 9.2$& $61.9 \pm 7.9$& $35.7 \pm 6.0$& $5.9 \pm 2.4$& $1.0 \pm 1.0$& $1.0 \pm 1.0$& $0.0 \pm 0.0$& $0.0 \pm 0.0$ \\ |
| 251 |
+ |
%\hline |
| 252 |
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%T2tt m(stop) = 300 m($\chi^0$) = 50 & $61.4 \pm 4.7$& $53.6 \pm 4.4$& $42.0 \pm 3.9$& $14.3 \pm 2.3$& $7.2 \pm 1.6$& $1.8 \pm 0.8$& $0.7 \pm 0.5$& $0.0 \pm 0.0$ \\ |
| 253 |
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%\hline |
| 254 |
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%T2tt m(stop) = 300 m($\chi^0$) = 100 & $33.3 \pm 3.5$& $28.6 \pm 3.2$& $19.2 \pm 2.6$& $6.1 \pm 1.5$& $1.8 \pm 0.8$& $0.4 \pm 0.4$& $0.4 \pm 0.4$& $0.4 \pm 0.4$ \\ |
| 255 |
+ |
%\hline |
| 256 |
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%T2tt m(stop) = 350 m($\chi^0$) = 0 & $33.4 \pm 2.2$& $29.8 \pm 2.1$& $27.3 \pm 2.0$& $15.3 \pm 1.5$& $5.6 \pm 0.9$& $1.9 \pm 0.5$& $0.3 \pm 0.2$& $0.0 \pm 0.0$ \\ |
| 257 |
+ |
%\hline |
| 258 |
+ |
%T2tt m(stop) = 450 m($\chi^0$) = 0 & $12.0 \pm 0.6$& $11.3 \pm 0.6$& $10.6 \pm 0.6$& $7.8 \pm 0.5$& $5.4 \pm 0.4$& $3.1 \pm 0.3$& $1.8 \pm 0.2$& $0.6 \pm 0.1$ \\ |
| 259 |
+ |
%\hline |
| 260 |
+ |
%T2bw m(stop) = 350 x=0.5 m($\chi^0$) = 0 & $48.5 \pm 1.9$& $40.2 \pm 1.7$& $33.0 \pm 1.5$& $14.4 \pm 1.0$& $5.7 \pm 0.6$& $2.7 \pm 0.4$& $1.3 \pm 0.3$& $0.5 \pm 0.2$ \\ |
| 261 |
+ |
%\hline |
| 262 |
+ |
%T2bw m(stop) = 450 x=0.75 m($\chi^0$) = 0 & $22.3 \pm 0.6$& $20.2 \pm 0.6$& $17.3 \pm 0.5$& $11.3 \pm 0.4$& $6.2 \pm 0.3$& $3.1 \pm 0.2$& $1.3 \pm 0.1$& $0.7 \pm 0.1$ \\ |
| 263 |
+ |
%\hline |
| 264 |
+ |
|
| 265 |
+ |
%CR4 DUMP |
| 266 |
+ |
%\hline |
| 267 |
+ |
%Total & $510.1 \pm 8.0$& $324.2 \pm 6.3$& $168.2 \pm 4.5$& $51.5 \pm 2.5$& $19.6 \pm 1.5$& $7.8 \pm 1.0$& $2.6 \pm 0.6$& $1.1 \pm 0.3$ \\ |
| 268 |
+ |
%\hline |
| 269 |
+ |
%\hline |
| 270 |
+ |
%Data & $462$& $289$& $169$& $45$& $10$& $7$& $5$& $3$ \\ |
| 271 |
+ |
%\hline |
| 272 |
+ |
%T2tt m(stop) = 250 m($\chi^0$) = 0 & $37.7 \pm 6.1$& $30.9 \pm 5.5$& $18.0 \pm 4.2$& $6.0 \pm 2.5$& $2.0 \pm 1.4$& $0.0 \pm 0.0$& $0.0 \pm 0.0$& $0.0 \pm 0.0$ \\ |
| 273 |
+ |
%\hline |
| 274 |
+ |
%T2tt m(stop) = 300 m($\chi^0$) = 50 & $16.6 \pm 2.4$& $14.4 \pm 2.3$& $11.3 \pm 2.0$& $5.6 \pm 1.4$& $3.2 \pm 1.1$& $1.8 \pm 0.8$& $0.0 \pm 0.0$& $0.0 \pm 0.0$ \\ |
| 275 |
+ |
%\hline |
| 276 |
+ |
%T2tt m(stop) = 300 m($\chi^0$) = 100 & $9.6 \pm 1.8$& $6.4 \pm 1.5$& $4.6 \pm 1.3$& $0.7 \pm 0.5$& $0.4 \pm 0.4$& $0.0 \pm 0.0$& $0.0 \pm 0.0$& $0.0 \pm 0.0$ \\ |
| 277 |
+ |
%\hline |
| 278 |
+ |
%T2tt m(stop) = 350 m($\chi^0$) = 0 & $8.2 \pm 1.1$& $7.6 \pm 1.0$& $5.7 \pm 0.9$& $3.4 \pm 0.7$& $1.9 \pm 0.5$& $0.6 \pm 0.3$& $0.3 \pm 0.2$& $0.1 \pm 0.1$ \\ |
| 279 |
+ |
%\hline |
| 280 |
+ |
%T2tt m(stop) = 450 m($\chi^0$) = 0 & $3.1 \pm 0.3$& $2.9 \pm 0.3$& $2.6 \pm 0.3$& $2.0 \pm 0.2$& $1.4 \pm 0.2$& $1.0 \pm 0.2$& $0.4 \pm 0.1$& $0.2 \pm 0.1$ \\ |
| 281 |
+ |
%\hline |
| 282 |
+ |
%T2bw m(stop) = 350 x=0.5 m($\chi^0$) = 0 & $52.6 \pm 1.9$& $42.6 \pm 1.7$& $32.1 \pm 1.5$& $14.7 \pm 1.0$& $5.5 \pm 0.6$& $1.9 \pm 0.4$& $0.6 \pm 0.2$& $0.3 \pm 0.1$ \\ |
| 283 |
+ |
%\hline |
| 284 |
+ |
%T2bw m(stop) = 450 x=0.75 m($\chi^0$) = 0 & $16.9 \pm 0.5$& $14.9 \pm 0.5$& $10.5 \pm 0.4$& $6.1 \pm 0.3$& $3.1 \pm 0.2$& $1.5 \pm 0.1$& $0.6 \pm 0.1$& $0.3 \pm 0.1$ \\ |
| 285 |
+ |
%\hline |
| 286 |
+ |
|
| 287 |
|
|
| 288 |
|
\subsubsection{Check of the uncertainty on the \ttll\ Background} |
| 289 |
|
|
