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\label{sec:bkg} |
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In this section we describe the techniques used to estimate the SM backgrounds in our signal regions defined by requirements of large \MET. |
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The SM backgrounds fall into 3 categories: |
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The SM backgrounds fall into four categories: |
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\begin{itemize} |
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\item \zjets: this is the dominant background after performing the preselection. The \MET\ in \zjets\ events is estimated with the |
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\item \zjets: this is the dominant background after the preselection. The \MET\ in \zjets\ events is estimated with the |
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``\MET\ templates'' technique described in Sec.~\ref{sec:bkg_zjets}; |
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\item Flavor-symmetric (FS) backgrounds: this category includes processes which produces 2 leptons of uncorrelated flavor. It is dominated |
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by \ttbar\ but also contains Z$\to\tau\tau$, WW, and single top processes. This is the dominant contribution in the signal regions, and it |
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is estimated using a data control sample of e$\mu$ events; |
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is estimated using a data control sample of e$\mu$ events as described in Sec.~\ref{sec:bkg_fs}; |
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\item WZ and ZZ backgrounds: this background is estimated from MC, after validating the MC modeling of these processes using data control |
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samples with jets and exactly 3 leptons (WZ control sample) and exactly 4 leptons (ZZ control sample). |
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samples with jets and exactly 3 leptons (WZ control sample) and exactly 4 leptons (ZZ control sample) as described in Sec.~\ref{sec:bkg_vz}; |
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\item Rare SM backgrounds: this background contains rare processes such as $t\bar{t}$V and triple vector boson processes VVV (V=W,Z). |
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This background is estimated from MC. {\bf TODO: add rare MC} |
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This background is estimated from MC as described in Sec.~\ref{sec:bkg_raresm}. {\bf TODO: add rare MC} |
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\end{itemize} |
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\subsection{Estimating the \zjets\ Background with \MET\ Templates} |
