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\clearpage |
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\section{Systematic Uncertainties in Signal Acceptance} |
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\label{sec:syst} |
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In this section we discuss systematic uncertainties in the signal acceptance. These efficiency |
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uncertainties are relevant for the interpretations in the \wzmet\ and the GMSB models, which |
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Source & Value (\%) & Method \\ |
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Luminosity & 4.4 & official CMS value \\ |
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Trigger efficiency & 3 & efficiency measurements documented in Sec. 4, Table 9 of AN-2012/248 \\ |
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Trigger efficiency & 5 & efficiency measurements documented in Sec. 4, Table 9 of AN-2012/248 \\ |
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Lepton ID/isolation & 2 (per lepton) & Z tag-and-probe measurements in AN-2012/257 \\ |
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B-veto & 6 & dedicated measurement in AN-2012/248 Sec. 7.6 \\ |
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Z mass window requirement & 3 & see text and Table~\ref{tab:mllsyst} \\ |
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\end{table} |
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A summary of the efficiency uncertainties is presented in Table~\ref{tab:syst}. |
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The CMS uncertainty in the luminosity is 4.4\%. The trigger efficiency is measured in AN-2102/248 with an uncertainty of 3\%. |
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The CMS uncertainty in the luminosity is 4.4\%. The trigger efficiency is measured in AN-2102/248 with an uncertainty of 5\%. |
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The lepton identification and isolation requirements are measured in data and MC and found to be consistent within 2\%, for |
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the \pt\ $>$ 20 GeV region relevant for this analysis, in AN-2012/257. The impact of the b-veto on the signal acceptance |
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is quantified with a dedicated measurement performed in Sec. 7.6 of AN-2012/248. The uncertainty in the selection of dilepton |
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& ee & $\mu\mu$ \\ |
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\hline |
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MC loose & 200694.0 & 285462.5 \\ |
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MC tight & 183326.2 & 260960.0 \\ |
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MC loose & 190661.9 & 238969.2 \\ |
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MC tight & 174162.5 & 218462.9 \\ |
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MC tight/loose & 0.913 $\pm$ 0.005 & 0.914 $\pm$ 0.004 \\ |
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\hline |
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data loose & 209540 & 263747 \\ |
