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\subsubsection{Dimuon Reconstruction efficiency}
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A CMSSW skim job was prepared to select events
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with at least two reconstructed muons with $p_T > 5$ GeV/c or at least one reconstructed muon with $p_T > 20$ GeV/c.
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This event selection was applied to the $Z\rightarrow \mu\mu$ and the
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EWK-Soup datasets. The skim jobs ran at two Tier-1 centers
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(FNAL and Spain) and the selected events were transfered to the Tier-2
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center at Purdue. The selection efficiency is about 23\%.
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Using these skimmed datasets a study of calculating muon
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reconstruction efficiency from data was
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performed. The idea is to compare and cross-check muons reconstructed
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in the tracker system, the standalone muon system, and the full
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tracker+muon system, thus allowing to obtain reconstruction
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efficiencies without relying on Monte Carlo information.
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We calculate the dimuon invariant mass spectrum using opposite-sign
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muon pairs from
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\begin{itemize}
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\item Monte Carlo simulation,
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\item global muon reconstruction,
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\item combinations of global and standalone muons,
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\item combinations of one global muon and one tracker track.
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\end{itemize}
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To avoid double counting a minimal separation of $\delta R = 0.3$ between the two muons is required.
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Figure~\ref{fig:dimu_pt} shows the muon $p_T$ distribution for
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selected events
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with only a single muon. Figure~\ref{fig:dimu_mass} shows the
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opposite-sign dimuon mass spectrum.
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\begin{2figures}{hbt}
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\centering
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\includegraphics[width=1 \linewidth]{figs/dimu_pt} &
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\includegraphics[width=1 \linewidth]{figs/dimu_mass} \\
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\caption[]{The muon $p_T$ distribution for selected events with
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only a single muon.
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}
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\label{fig:dimu_pt} &
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\caption{The opposite-sign dimuon mass spectrum.}
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\label{fig:dimu_mass}
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\end{2figures}
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%\begin{2figures}{hbt}
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%\centering
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%\includegraphics[angle=90, width=1 \linewidth]{figs/norma_pt_isol} &
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%\includegraphics[angle=90, width=1 \linewidth]{figs/norma_mt_isol} \\
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% \caption[]{Transverse momentum of muons after the isolation cuts.}
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% \label{fig:wmunu_ptnormiso} &
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% \caption{Transver mass of W bosons candidate after the isolation cuts.}
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% \label{fig:wmunu_mtnormiso}
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%\end{2figures}
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