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\clearpage
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\section{Datasets and Triggers}
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\label{sec:datasets}
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In this section we list the datasets, triggers, and MC samples used in the analysis. For selecting signal
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events, we use dilepton triggers in the DoubleElectron, DoubleMu, and MuEG datasets.
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An event in the ee final state is required to pass the dielectron trigger, a
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$\mu\mu$ event is required to pass the dimuon trigger, while an e$\mu$ event is required to pass at least one
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of the two $e-\mu$ cross triggers. The efficiencies of the ee, $\mu\mu$ and e$\mu$ triggers with respect to the
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offline selection have been measured as $0.95\pm0.03$, $0.88\pm0.03$, and $0.92\pm0.03$, respectively~\cite{ref:SSAN}.
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These trigger efficiencies were measured with the first 5.1 fb$^{-1}$ and will be updated with the full data sample.
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Preliminary measurements of the trigger efficiency with the full sample show consistent results within $\sim1-2$\%.
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A sample of \gjets\ events, used as a control sample to estimate the \zjets\
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background, is selected using a set of single photon triggers.
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The golden json of Aug 31st, corresponding to an integrated luminosity of 9.7 fb$^{-1}$, is used as the starting point.
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However, due to a bug in the Run2012C-PromptReco-v1 data samples (corresponding to 0.5 fb$^{-1}$), this portion of the data
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is currently excluded but will be added back after its reprocessed. Thus we currently use a sample corresponding to \lumi.
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All data and MC samples are processed in CMSSW\_5\_3\_2\_patch4.
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\begin{itemize}
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\item Datasets
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\begin{itemize}
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\item \verb=/DoubleElectron/Run2012A-13Jul2012-v1/AOD=
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\item \verb=/DoubleMu/Run2012A-13Jul2012-v1/AOD=
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\item \verb=/MuEG/Run2012A-13Jul2012-v1/AOD=
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\item \verb=/DoubleElectron/Run2012B-13Jul2012-v1/AOD=
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\item \verb=/DoubleMu/Run2012B-13Jul2012-v1/AOD=
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\item \verb=/MuEG/Run2012B-13Jul2012-v1/AOD=
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\item \verb=/DoubleElectron/Run2012C-PromptReco-v2/AOD=
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\item \verb=/DoubleMu/Run2012C-PromptReco-v2/AOD=
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\item \verb=/MuEG/Run2012C-PromptReco-v2/AOD=
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\end{itemize}
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\item Triggers
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\begin{itemize}
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\item \verb=HLT_Mu17_Mu8_v*=
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\item \verb=HLT_Mu17_Ele8_CaloIdT_CaloIsoVL_TrkIdVL_TrkIsoVL_v*=
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\item \verb=HLT_Mu8_Ele17_CaloIdT_CaloIsoVL_TrkIdVL_TrkIsoVL*=
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\item {\footnotesize \verb=HLT_Ele17_CaloIdT_CaloIsoVL_TrkIdVL_TrkIsoVL_Ele8_CaloIdT_CaloIsoVL_TrkIdVL_TrkIsoVL_v*=}
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\item \verb=HLT_Photon22_R9Id90_HE10_Iso40_EBOnly_v*=
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\item \verb=HLT_Photon36_R9Id90_HE10_Iso40_EBOnly_v*=
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\item \verb=HLT_Photon50_R9Id90_HE10_Iso40_EBOnly_v*=
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\item \verb=HLT_Photon75_R9Id90_HE10_Iso40_EBOnly_v*=
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\item \verb=HLT_Photon90_R9Id90_HE10_Iso40_EBOnly_v*=
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\end{itemize}
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\end{itemize}
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\begin{table}[htb]
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\begin{center}
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\scriptsize
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\caption{\label{tab:mcsamples} List of MC samples.}
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\begin{tabular}{l|l|c}
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\hline
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\hline
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Process & Dataset Name & Cross Section [pb] \\
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\hline
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\zjets & \verb=/DYJetsToLL_M-50_TuneZ2Star_8TeV-madgraph-tarball/Summer12_DR53X-PU_S10_START53_V7A-v1/AODSIM= & 3532.8 \\
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\hline
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\ttbar & \verb=/TTJets_MassiveBinDECAY_TuneZ2star_8TeV-madgraph-tauola/Summer12_DR53X-PU_S10_START53_V7A-v1/AODSIM= & 225.2 \\
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\hline
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ZZ & \verb=/ZZJetsTo4L_TuneZ2star_8TeV-madgraph-tauola/Summer12_DR53X-PU_S10_START53_V7A-v1/AODSIM= & 0.1769 \\
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& \verb=/ZZJetsTo2L2Q_TuneZ2star_8TeV-madgraph-tauola/Summer12_DR53X-PU_S10_START53_V7A-v1/AODSIM= & 2.4487 \\
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& \verb=/ZZJetsTo2L2Nu_TuneZ2star_8TeV-madgraph-tauola/Summer12_DR53X-PU_S10_START53_V7A-v3/AODSIM= & 0.3648 \\
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\hline
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WZ & \verb=/WZJetsTo3LNu_TuneZ2_8TeV-madgraph-tauola/Summer12_DR53X-PU_S10_START53_V7A-v1/AODSIM= & 1.0575 \\
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& \verb=/WZJetsTo2L2Q_TuneZ2star_8TeV-madgraph-tauola/Summer12_DR53X-PU_S10_START53_V7A-v1/AODSIM= & 2.206 \\
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\hline
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WW & \verb=/WWJetsTo2L2Nu_TuneZ2star_8TeV-madgraph-tauola/Summer12_DR53X-PU_S10_START53_V7A-v1/AODSIM= & 5.8123 \\
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\hline
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single top & \verb=/T_tW-channel-DR_TuneZ2star_8TeV-powheg-tauola/Summer12_DR53X-PU_S10_START53_V7A-v1/AODSIM= & 11.177 \\
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& \verb=/Tbar_tW-channel-DR_TuneZ2star_8TeV-powheg-tauola/Summer12_DR53X-PU_S10_START53_V7A-v1/AODSIM= & 11.177 \\
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\hline
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ttV & \verb=/TTZJets_8TeV-madgraph_v2/Summer12_DR53X-PU_S10_START53_V7A-v1/AODSIM= & 0.208 \\
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& \verb=/TTWJets_8TeV-madgraph/Summer12_DR53X-PU_S10_START53_V7A-v1/AODSIM= & 0.232 \\
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\hline
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VVV & \verb=/ZZZNoGstarJets_8TeV-madgraph/Summer12_DR53X-PU_S10_START53_V7A-v1/AODSIM= & 0.01922 \\
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& \verb=/WWWJets_8TeV-madgraph/Summer12_DR53X-PU_S10_START53_V7A-v1/AODSIM= & 0.08217 \\
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& \verb=/WWZNoGstarJets_8TeV-madgraph/Summer12_DR53X-PU_S10_START53_V7A-v1/AODSIM= & 0.0633 \\
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%& \verb=/ZZZNoGstarJets_8TeV-madgraph/Summer12_DR53X-PU_S10_START53_V7A-v1/AODSIM= & 0.01922 \\
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\hline
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\hline
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\end{tabular}
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\end{center}
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\end{table}
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