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This analysis uses several different control regions in addition to the signal regions. |
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All of these different regions are defined in this section. |
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Figure~\ref{fig:venndiagram} illustrates the relationship between these regions. |
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The preselection sample is based on the following criteria |
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\subsection{Single Lepton Selections} |
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The single lepton preselection sample is based on the following criteria |
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\begin{itemize} |
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\item satisfy the trigger requirement (see |
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Table.~\ref{tab:DatasetsData}) |
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Table.~\ref{tab:DatasetsData}). Dilepton triggers are used only for the dilepton control region. |
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\item select events with one high \pt\ electron or muon, requiring |
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\begin{itemize} |
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\item $\pt>30~\GeVc$ and $|\eta|<2.5(2.1)$ for \E(\M) |
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SUSY analysis (SUS-11-011) for muons |
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\end{itemize} |
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\item require at least 4 PF jets in the event with $\pt>30~\GeV$ |
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within $|\eta|<2.5$, out of which at least 1 is b-tagged based on |
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the SSV medium working point. |
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within $|\eta|<2.5$ |
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\item require moderate $\met>50~\GeV$ |
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\end{itemize} |
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In addition, we count the number of SSV medium working point b-tags, $N_{b-tag}$. |
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Currently, we focus on the muon channel because it is cleaner (the QCD contribution is negligible) |
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and the triggers are simpler (we use single muon triggers, as opposed to electron + 3-jet triggers). |
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We will add the electron channel, time permitting. However, since this is a systematics-dominated |
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analysis, increasing the statistics by adding the electrons is not expected to significantly improve |
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the sensitivity, especialy because the electron selection efficiency is smaller and the systematic |
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the sensitivity, especially because the electron selection efficiency is smaller and the systematic |
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uncertainty associated with the QCD background is larger. |
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A benchmark signal region is selected by tightening the \met\ and |
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adding an \mt\ requirement |
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We then define the following subsamples within this preselection sample: |
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\begin{itemize} |
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\item $\met>100~\GeV$ |
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\item $\mt>150~\GeV$ |
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\item $N_{b-tag} = 0$, i.e. b-veto region |
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\item $N_{b-tag} \ge 1 $, i.e. b-tagged region |
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\begin{itemize} |
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\item without an additional isolated track veto |
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\item with an additional isolated track veto |
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\end{itemize} |
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\end{itemize} |
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For the signal regions, we then furthermore require $\met>100~\GeV$ while some of the background predictions and scale factors |
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are done for both \met |
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requirements to show stability of the method. |
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Within each of these subsamples we then define an \mt peak ($60 < \mt < 100~\GeV$) region and an \mt tail ($\mt > 150~\GeV$) region |
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% |
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We generally use the \mt peak region yields in data and multiply it by the ratio of tail divided by peak in MC times appropriate corrections |
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in order to estimate the background in data in the tail region. |
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{\bf We have not looked at the data in the signal region after the first 1 fb$^{-1}$ of data.} |
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\subsection{Dilepton control region} |
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We define a dilepton control region requiring two isolated leptons, $ee, e\mu$, or $\mu\mu$ to study the jet multiplicity in data and MC, and derive |
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scale factors based on their consistency. This study is documented in Section~\ref{sec:jetmultiplicity}. |
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{\bf Fix me: Need to describe here the actual selection. What lepton pT's, \met , etc. } |
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This sample is only partially overlapping with the single lepton preselection as it requires the dilepton rather than the single lepton triggers. |
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\subsection{Corrections to Jets and \met} |
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The official recommendations from the Jet/MET group are used for |
