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\section{Systematic uncertainties} |
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\label{sec:systematic} |
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In this section, we estimate systematics uncertainties of the methods |
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used in this analysis. We follow the rule of making conservative estimates |
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throughout this section. |
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\subsection{Modeling systematics} |
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The sources of systematic uncertainties due to modeling of trigger, |
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reconstruction, PDF, and luminosity are described below |
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systematic uncertainty is conservatively estimated as 1\%. From the |
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current analysis of $Z\rightarrow l^+l^-$ in |
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CMS~\ref{Zmumu}~\ref{Zee}, the number of \Z events is estimated of the |
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order of 50k per 100pb$^{-1}$ of data analysed. To determine the |
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order of 50k per 100 pb$^{-1}$ of data analysed. To determine the |
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trigger efficiency ``tag-and-probe'' method~\ref{TP} will be used. |
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\item {\it Reconstruction}: we assign 2\% systematic uncertainty per |
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uncertainty due to efficiency measurement from early data using |
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``tag-and-probe'' method and 2\% for that for a muon. Additionally we |
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assign a systematic uncertainty on lepton energy scale of 2\% per |
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lepton. The letpons scale will be established using the \Z mass peak. |
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lepton. The leptons scale will be established using the \Z mass peak. |
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\item {\it PDF uncertainties}: we estimate PDF uncertainties following prescription |
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described in~\cite{OldNote}. The uncertainty is found to be |
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\end{center} |
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\caption{Systematic uncertainties for $pp\rightarrow \WZ$ cross section measurement |
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and significance estimation for 1 fb$^-1$ of integrated luminosity.} |
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and significance estimation for 300 \invpb of integrated luminosity.} |
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\label{tab:sys} |
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\end{table} |
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$Z+jets$ will be determine using the method described |
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in~\ref{sec:D0Matrix}. |
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From the fit, we will consider a systematics error of 10\%. |
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%From the fit, we will consider a systematics error of 10\%. |
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If we consider an error of 10\% |
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on the fake rate and an error of 2\% |
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If we consider an error of 4\% |
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on the fake rate and an error of 1\% |
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on the efficiency on signal to go from loose to tight criteria, we can |
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calculate the error on the estimated background as follow: |
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\begin{equation} |
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on this value.$p$ gives the probability for a fake loose electron to |
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pass also the tight criteria and $\Delta p$ its error. |
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The overall error from the background substraction is XXX %18\%. |
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%The overall error from the background substraction is XXX %18\%. |
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\subsection{Summary of Systematics} |
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\end{tabular} |
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\end{center} |
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\caption{Systematics per channels in percent for $pp\rightarrow WZ$ cross section measurement and significance estimation for 1 fb$^-1$ of integrated luminosity. These systematics do not include the background substraction.} |
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\caption{Systematics per channels in percent for $pp\rightarrow WZ$ cross section measurement and significance estimation for 300 \invpb of integrated luminosity. These systematics do not include the background substraction.} |
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\label{tab:FullSys} |
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\end{table} |
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