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Revision 1.11 by vuko, Sun Jun 22 23:14:53 2008 UTC

+\section{Event reconstruction}
+\label{sec:eventReconstruction}
-<
+\subsection{Trigger selection and efficiencies}
->
+The four possible final states of \WZ
->
+production with electrons and muons in the final state are studied, $\rm e^\pm \epem$, $\mu^\pm \epem$, $\rm e^\pm \mu^+\mu^-$
->
+and $\mu^\pm \mu^+\mu^-$. They are associated to four possible classes,
->
+denoted as follows:
->
+\begin{itemize}
->
+\item $3e$: for \WZ events with $\W \to e \nu$ and $\Z\to \epem$.
->
+\item $2e1\mu$: for \WZ events with $\W \to \mu \nu$ and $\Z\to \epem$.
->
+\item $2\mu 1e$: for \WZ events with $\W \to e \nu$ and $\Z\to \mumu$.
->
+\item $3\mu$: for \WZ events with $\W \to \mu \nu$ and $\Z\to \mumu$.
->
+\end{itemize}
-<
+\subsection{Lepton identification}
->
+\subsection{Trigger selection and efficiencies}
-+
+Events stemming from the three-lepton final states of $\WZ$ production
-+
+are collected by the electron and/or muon triggers. For each channel,
-+
+a minimun number of HLT requirements is chosen while keeping
-+
+the HLT efficiency for selected events close to 100\%. The same
-+
+HLT requirements are used for channels with the same Z decay mode:
-+
+\begin{itemize}
-+
+\item for $3e$ and $2e1\mu$: HLTSingleElectron or HLTDoubleElectronRelaxed
-+
+\item for $2\mu1e$ and $3\mu$: HLTSingleMuonIso
-+
+\end{itemize}
-+
+The HLT efficiencies for all modes for events passing the full
-+
+selection described in this section are given in table~\ref{tab:hlteff}.
-+
-+
-+
+\begin{table}[tbph]
-+
+\begin{center}
-+
-+
+\begin{tabular}{llc} \hline \hline
-+
+Channel    &   HLT selection                                   & HLT efficiency \\ \hline
-+
+$3e$       &   HLTSingleElectron or HLTDoubleElectronRelaxed   &  0.996         \\
-+
+$2e1\mu$   &   HLTSingleElectron or HLTDoubleElectronRelaxed   &  0.969         \\
-+
+$2\mu 1e$  &   HLTSingleMuonIso                                &  0.966         \\
-+
+$3\mu$     &   HLTSingleMuonIso                                &  0.994         \\ \hline \hline
-+
+\end{tabular}
-+
-+
+\end{center}
-+
+\caption{HLT Efficiencies, in percent, for all
-+
+  the events in the generated phase space that have been retained  by
-+
+  the complete event selection.}
-+
+\label{tab:hlteff}
-+
+\end{table}
-+
-+
-+
+\begin{figure}[tbp]
-+
+  \begin{center}
-+
+  \scalebox{0.7}{\includegraphics{figs/mu_isol.eps}}
-+
+  \caption{Muon isolation variables for the muon associated
-+
+    to the \W-boson decay in $2e1\mu$ events: the left plot
-+
+    shows the sum of calorimetric energy in a $\Delta R=0.3$ cone
-+
+    around the muon candidate; the right plot shows the sum of
-+
+    transverse momenta of tracks within a $\Delta R = 0.25$ cone around
-+
+    the muon candidate. The normalization of signal and background
-+
+    distributions is arbitrary.
-+
+}
-+
+  \label{fig:mu_isol}
-+
+  \end{center}
-+
+\end{figure}
-+
-+
+\begin{figure}[tb]
-+
+  \begin{center}
-+
+  \scalebox{0.6}{\includegraphics{figs/mu_SIP.eps}}
-+
+  \caption{
-+
+    Muon impact parameter significance distribution
-+
+    in $2e1\mu$ events. The normalization of signal and background
-+
+    distributions is arbitrary.
-+
+  }
-+
+  \label{fig:mu_SIP}
-+
+  \end{center}
-+
+\end{figure}
-<
+\subsection{\WZ candidate selection}
->
+\subsection{Lepton identification}
->
+\label{sec:leptonId}
-+
+The requirements used for electron identification in this analysis are described
-+
+in~\cite{noteElectronID}.
-<
+\subsection{Signal extraction}
->
+Muon candidates are selected from global muons, which are reconstructed
->
+combining measurements in the muon chambers and the central tracker.
->
+An additional isolation criterion requires that the energy
->
+measured in the calorimeters within a $\Delta R = 0.3$ cone around the
->
+muon must be smaller than 3 GeV and the sum of the $p_t$ of tracks
->
+within a $\Delta R = 0.25$ cone around the muon must be smaller than 2 \gev.
->
+These cuts reduce the background from muons originated in
->
+\b-quark decays of the $\Zbbbar$ background, which are close to tracks
->
+and clusters from the other \b-quark decay products.
->
->
+%Figures~\ref{fig:muonisol} and ~\ref{fig:muonisoleffi} show the
->
+%performance of the isolation cut. The distribution of the isolation
->
+%variables for the $\Z\b\bbar(\epem\b\bbar)$ is particularly
->
+%interesting, since muons only stem from  \b-quark decays.
->
->
+The significance of the muon impact parameter in the plane
->
+transverse to the beam, $S_{IP}$, discriminates against leptons from
->
+heavy-quark decays in all Standard Model background processes. This
->
+variable is defined as the ratio between the measured impact parameter
->
+and its uncertainty: $S_{IP}=IP/\sigma_{IP}$, and is required to
->
+satisfy $S_{IP}<3$. This requirement is applied only for muons
->
+and not for electrons. For electrons, a significant fraction of the
->
+background comes from fake electrons and not from heavy quark decays,
->
+and a cut on the impact parameter significance shows no improvement
->
+in significance for the $\W\to e$ channels, as can be seen in
->
+Figure~\ref{fig:wl_IP_SvsCut}.
->
->
+\begin{figure}[p]
->
+  \begin{center}
->
+  \scalebox{0.6}{\includegraphics{figs/wl_IP_eff.eps}}
->
+  \caption{Efficiency for signal and background as a function
->
+    of the cut value on the \W-boson lepton impact parameter
->
+    significance. All other cuts but the cut on this variable
->
+    are applied.
->
+%    Only events with 81.1 GeV $< M_Z < $ 101.1 \gev
->
+%    are considered.
->
+  }
->
+  \label{fig:wl_IP_eff}
->
+  \end{center}
->
+%\end{figure}
->
->
+%\begin{figure}[bt]
->
+  \begin{center}
->
+  \scalebox{0.6}{\includegraphics{figs/wl_IP_SvsCut.eps}}
->
+  \caption{Signal significance as a function of the cut value on
->
+    the \W-boson lepton impact parameter significance. All other cuts but
->
+    the cut on this variable are applied.
->
+%    Only events with 81.1 GeV $< M_Z < $ 101.1 \gev are considered.
->
+  }
->
+  \label{fig:wl_IP_SvsCut}
->
+  \end{center}
->
+\end{figure}
->
->
->
+\begin{table}[tbp]
->
+\begin{tabular}{|l|c|c|c|c|} \hline
->
+              &  $3e$ & $2e1\mu$ & $2\mu 1e$ & $3\mu$ \\ \hline \hline
->
+\multicolumn{5}{|c|}{Lepton selection} \\ \hline
->
+Electrons     &   \multicolumn{3}{|c|}{{\tt SimpleLoose} requirements for Z reconstruction} & \\
->
+              &   \multicolumn{3}{|c|}{{\tt SimpleTight} requirements for W} &  \\ \hline
->
+Muons         &  &  \multicolumn{3}{|c|}{ Track Isolation:$ {\tt IsoTrack}(\Delta R= 0.25) < 2 \gev$}  \\
->
+              &  &  \multicolumn{3}{|c|}{ Calorimetric Isolation:$  {\tt IsoCalo}(\Delta R = 0.3)  < 5 \gev$}  \\
->
+              &  &  \multicolumn{3}{|c|}{$S_{IP}=IP/\sigma_{IP}<3$ }  \\ \hline
->
+HLT requirement & \multicolumn{2}{|c|}{ HLTSingleElectron or HLTDoubleElectronRelaxed}
->
+                & \multicolumn{2}{|c|}{  HLTSingleMuonIso} \\ \hline
->
+\multicolumn{5}{|c|}{Z reconstruction} \\ \hline
->
+Lepton cuts   &  \multicolumn{4}{|c|}{for both Z leptons: $p_t > 15 GeV$} \\
->
+Mass window   &  \multicolumn{4}{|c|}{$50 \gev < M_Z < 120 \gev $ } \\
->
+Second Z veto &  \multicolumn{4}{|c|}{No independent second Z candidate with $50 \gev < M_Z < 120 \gev $ } \\ \hline
->
+\multicolumn{5}{|c|}{W lepton selection} \\ \hline
->
->
+Other cuts    &     &        & $\Delta R(\mu_Z,e_W)>0.1$ &  \\ \hline
->
+Signal region  &    \multicolumn{4}{|c|}{$81 \gev < M_Z < 101 \gev $ } \\ \hline \hline
->
->
+\end{tabular}
->
+\caption{Summary of all cuts used in the WZ selection}
->
+\label{tab:allcuts}
->
+\end{table}
->
->
->
+\begin{figure}[p]
->
+  \begin{center}
->
+  \scalebox{0.6}{\includegraphics{figs/wlpt_cuteff.eps}}
->
+  \caption{Efficiency for signal and background as a function
->
+    of the cut value on the \W-boson lepton transverse momentum.
->
+    All other cuts but the cut on this variable are applied.
->
+    Only events with 81.1 GeV $< M_Z < $ 101.1 \gev
->
+    are considered.}
->
+  \label{fig:wlpt_cuteff}
->
+  \end{center}
->
+%\end{figure}
->
->
+%\begin{figure}[bt]
->
+  \begin{center}
->
+  \scalebox{0.6}{\includegraphics{figs/wlpt_cutS.eps}}
->
+  \caption{Signal significance as a function of the cut value on
->
+    the \W-boson lepton transverse momentum. All other cuts but
->
+    the cut on this variable are applied. Only events with
->
+.1 GeV $< M_Z < $ 101.1 \gev are considered.}
->
+  \label{fig:wlpt_cutS}
->
+  \end{center}
->
+\end{figure}
-<
+\subsection{Systematic uncertainties}
->
+\subsection{\WZ candidate selection}
-+
+Events are accepted if they contain at least three charged leptons,
-+
+either electrons or muons, with $p_t > 15\,\mathrm{GeV}$ and $| \eta | < 2.5$ for
-+
+electrons,$| \eta | < 2.4$ for muons.
-+
+as discussed in~\ref{sec:leptonId}.
-+
-+
+The \WZ candidate selection proceeds from building all possible
-+
+\Z-boson candidates from same-flavour opposite-charge lepton pairs.
-+
+For $\Z \to ee$ decays, electrons have to fullfil the loose requirements
-+
+defined in~\cite{noteElectronID}.
-+
-+
+Events are retained if the mass of this \Z-boson candidate is
-+
+within 20 GeV of the Z-boson mass,$m_Z$. The event is
-+
+rejected if a second Z candidate is found. This second Z candidate is done
-+
+with all possible same-flavour opposite-charge combinations which are left
-+
+after removing the two leptons already used for the first Z candidate. This
-+
+veto on the presence of a second Z helps to suppress $ZZ$ events.
-+
+%The invariant
-+
+%mass distribution for accepted \Z candidates is shown in
-+
+%Figure~\ref{fig:zcandidates}.
-+
-+
+% and the \Z mass resolution is shown in
-+
+%Figure~\ref{fig:dzmass}.
-+
-+
+After the \Z-boson candidate is identified, the lepton associated
-+
+to the  \W-boson decay is chosen from the remaining electrons and muons
-+
+in the event that have not been used for reconstructing the \Z-boson.
-+
+Electrons are required to pass the tight criteria described in
-+
+\cite{noteElectronID}.  If the event contains more than three leptons,
-+
+the highest $p_t$ is chosen as the one from the \W-boson decay, and
-+
+the additional leptons are not considered further.
-+
+The transverse momentum of this lepton is required to be larger
-+
+than 20 GeV. This last requirement is effective in rejecting
-+
+the \Zbbbar and \Zjets backgrounds, see Figure~\ref{fig:wlpt_cuteff},
-+
+and the cut value is chosen in
-+
+the range that maximises the significance as shown in
-+
+Figure~\ref{fig:wlpt_cutS}.
-+
-+
+An additional requirement on the isolation between electron and muons is applied
-+
+for the $2\mu 1e$ channel, by demanding $\Delta R$ between the electron associated
-+
+to the \W-decay and any of the two muons associated to the \Z-decay be greater than
-+
+.1. This requirement allows to suppress the contributions of $\Z \to \mu\mu$
-+
+decays, where one of the two muons radiates a photon which is reconstructed
-+
+as electrons, possibly after conversion, which shows up as a peak at  around 60 GeV
-+
+in the Z mass distribution, as shown in figure~\ref{fig:Z2mu1e_60GeVPeak}.
-+
-+
+The summary of the selection is given in Table~\ref{tab:allcuts}.
-+
-+
+The expected number of events passing the various steps of the selection
-+
+is listed in Tables~\ref{tab:sel-effA}.
-+
+Table~\ref{tab:wz-effimatrix} lists the final selection efficiency for
-+
+the different generated \W and \Z decays. It can be seen there that \WZ\
-+
+events with both the \W and the \Z boson decaying into electrons or muons
-+
+almost always get reconstructed with the correct flavour. It is to be
-+
+noted in addition that each of our four selection channels gets a small
-+
+contribution from $W \to \tau \to e/\mu$ decays as one would expect. The
-+
+selection efficiency for these events is however smaller which is mostly due
-+
+to the \pt cut on the third lepton, since the \pt spectrum of electrons or
-+
+muons from $W \to \tau \to e/\mu$ decays is softer.
-+
-+
+Tables~ref\label{tab:wz-matcheffi-Zee} and \label{tab:wz-matcheffi-Zmumu} show
-+
+the fraction of reconstructed \WZ events with with correclty matched leptons
-+
+It is in particular worth mentioning that the lepton associated to the \W-decay
-+
+is correclty matched to the true lepton from the \W-decay in more than 90\% of
-+
+the cases even for events with several lepton candidates available to be associated
-+
+to the \W-decay. The choice to take the candidate with the leading \pt is therefore
-+
+justified.
-+
-+
+\begin{table}[p]
-+
+  \begin{center}
-+
-+
-+
-+
-+
+\begin{tabular}{lcccc} \hline
-+
+\multicolumn{5}{c}{ {\bf $3e$ Channel}} \\ \hline  \hline
-+
+Step   & WZ  & bbll  & Z+jets  & TTbar+jets\\ \hline
-+
+All events       & 546   & 72770.4       & 1.2679e+06    & 17556.1 \\
-+
+Found $Z \to ee$         & 204.969 (37.5401 \%)  & 27800.5 (38.203 \%)   & 502344 (39.62 \%)     & 2920.59 (16.6357 \%) \\
-+
+Found $W \to e$          & 41.9925 (20.4872 \%)  & 171.053 (0.615286 \%)         & 309.563 (0.0616238 \%)        & 13.8293 (0.473511 \%) \\
-+
+W Lepton Pt cut          & 34.8561 (83.0056 \%)  & 23.7161 (13.8648 \%)  & 86.7924 (28.037 \%)   & 8.25515 (59.6931 \%) \\
-+
+Passes HLT               & 34.7185 (99.6052 \%)  & 23.5679 (99.375 \%)   & 86.7924 (100 \%)      & 8.25515 (100 \%) \\
-+
+Z mass window    & 31.5533 (90.8834 \%)  & 17.4906 (74.2138 \%)  & 51.8927 (59.7894 \%)  & 3.2585 (39.4724 \%) \\ \hline
-+
+ Overall efficiency  & 5.77899 \% & 0.0240354 \% & 0.00409279 \% & 0.0185605 \% \\
-+
+\hline
-+
+\end{tabular}
-+
+\begin{tabular}{lcccc} \hline
-+
+\multicolumn{5}{c}{ {\bf $2e1\mu$ Channel}} \\ \hline  \hline
-+
+Step   & WZ  & bbll  & Z+jets  & \ttjets\\ \hline
-+
+All events       & 546   & 72770.4       & 1.2679e+06    & 17556.1 \\
-+
+Found $Z \to ee$         & 204.969 (37.5401 \%)  & 27800.5 (38.203 \%)   & 502344 (39.62 \%)     & 2920.59 (16.6357 \%) \\
-+
+Found $W \to \mu$        & 47.9099 (23.3743 \%)  & 747.725 (2.68961 \%)  & 2194.09 (0.436771 \%)         & 56.7645 (1.9436 \%) \\
-+
+W Lepton Pt cut          & 37.0973 (77.4313 \%)  & 9.63467 (1.28853 \%)  & 9.57604 (0.436446 \%)         & 17.5382 (30.8965 \%) \\
-+
+Passes HLT               & 36.1929 (97.5623 \%)  & 9.26411 (96.1538 \%)  & 8.32189 (86.9033 \%)  & 15.2488 (86.9457 \%) \\
-+
+Z mass window    & 32.5166 (89.8425 \%)  & 8.15242 (88 \%)       & 7.31467 (87.8968 \%)  & 4.91533 (32.2343 \%) \\ \hline
-+
+ Overall efficiency  & 5.95542 \% & 0.0112029 \% & 0.000576911 \% & 0.0279978 \% \\
-+
+\hline
-+
+\end{tabular}
-+
-+
+\begin{tabular}{lcccc} \hline
-+
+\multicolumn{5}{c}{ {\bf $2\mu1e$ Channel}} \\ \hline  \hline
-+
+Step   & WZ  & bbll  & Z+jets  & TTbar+jets\\ \hline
-+
+All events       & 546   & 72770.4       & 1.2679e+06    & 17556.1 \\
-+
+Found $Z \to \mu\mu$     & 233.75 (42.8114 \%)   & 31889.4 (43.8219 \%)  & 577257 (45.5284 \%)   & 2778.81 (15.8282 \%) \\
-+
+Found $W \to e$          & 48.7553 (20.8579 \%)  & 213.519 (0.669562 \%)         & 701.695 (0.121557 \%)         & 15.1085 (0.543704 \%) \\
-+
+W Lepton Pt cut                  & 40.6556 (83.3871 \%)  & 50.6191 (23.707 \%)   & 464.493 (66.196 \%)   & 10.2745 (68.0047 \%) \\
-+
+$\Delta R(e,\mu)$ cut    & 40.5573 (99.7582 \%)  & 23.3456 (46.1201 \%)  & 92.9813 (20.0178 \%)  & 7.14967 (69.5865 \%) \\
-+
+Passes HLT                       & 39.4171 (97.1886 \%)  & 23.1973 (99.3651 \%)  & 88.7791 (95.4806 \%)  & 6.6245 (92.6546 \%) \\
-+
+Z mass window    & 35.5638 (90.2244 \%)  & 18.8988 (81.4696 \%)  & 50.2509 (56.6022 \%)  & 2.84083 (42.8837 \%) \\ \hline
-+
+ Overall efficiency  & 6.51352 \% & 0.0259704 \% & 0.00396331 \% & 0.0161814 \% \\
-+
+\hline
-+
+\end{tabular}
-+
-+
-+
+\begin{tabular}{lcccc} \hline
-+
+\multicolumn{5}{c}{ {\bf $3\mu$ Channel}} \\ \hline  \hline
-+
+Step   & WZ  & bbll  & Z+jets  & TTbar+jets\\ \hline
-+
+All events       & 546   & 72770.4       & 1.2679e+06    & 17556.1 \\
-+
+Found $Z \to \mu\mu$     & 233.75 (42.8114 \%)   & 31889.4 (43.8219 \%)  & 577257 (45.5284 \%)   & 2778.81 (15.8282 \%) \\
-+
+Found $W \to \mu$        & 57.7986 (24.7267 \%)  & 810.721 (2.54229 \%)  & 2520.69 (0.436668 \%)         & 35.3061 (1.27054 \%) \\
-+
+W Lepton Pt cut                  & 44.2533 (76.5646 \%)  & 8.89355 (1.09699 \%)  & 1.84115 (0.0730414 \%)        & 1.683 (4.76688 \%) \\
-+
+Passes HLT                       & 43.9977 (99.4225 \%)  & 8.89355 (100 \%)      & 1.84115 (100 \%)      & 1.683 (100 \%) \\
-+
+Z mass window    & 40.0462 (91.0188 \%)  & 7.78185 (87.5 \%)     & 1.84115 (100 \%)      & 1.15783 (68.7957 \%) \\ \hline
-+
+ Overall efficiency  & 7.33446 \% & 0.0106937 \% & 0.000145212 \% & 0.00659501 \% \\
-+
+\hline
-+
+\end{tabular}
-+
-+
-+
+\caption{Expected number of signal and background events passing the different
-+
+  selections steps in the \WZ, \Zbbbar, \Zjets and \ttjets samples for an integrated luminosity
-+
+  of 1 \invfb.}
-+
+\label{tab:sel-effA}
-+
+\end{center}
-+
+\end{table}
-+
-+
+\begin{table}[p]
-+
+\begin{center}
-+
+\begin{tabular}{lccccc}
-+
+\hline \hline
-+
+ & \multicolumn{5}{c}{$Z \to ee $} \\
-+
+   &  $W \to e$
-+
+   &  $W \to \mu$
-+
+   &  $W \to \tau \to e$
-+
+   &  $W \to \tau \to \mu$
-+
+   &  $W \to \tau \to hadrons$
-+
+\\ \hline
-+
+$3e$       &  17.4 \%  &  0.0319 \%  &  6.42 \%  &  0 \%  &  0.162 \% \\
-+
+$2e1\mu$   &  0 \%  &  18.6 \%  &  0 \%  &  5.53 \%  &  0.0485 \% \\
-+
+$2\mu1e$   &  0 \%  &  0 \%  &  0 \%  &  0 \%  &  0 \% \\
-+
+$3\mu$     &  0 \%  &  0 \%  &  0 \%  &  0 \%  &  0 \% \\
-+
+\hline \hline
-+
+ & \multicolumn{5}{c}{$Z \to \mu\mu $} \\
-+
+   &  $W \to e$
-+
+   &  $W \to \mu$
-+
+   &  $W \to \tau \to e$
-+
+   &  $W \to \tau \to \mu$
-+
+   &  $W \to \tau \to hadrons$
-+
+\\ \hline
-+
+$3e$        &  0 \%  &  0 \%  &  0 \%  &  0 \%  &  0 \% \\
-+
+$2e1\mu$   &  0.0104 \%  &  0 \%  &  0 \%  &  0 \%  &  0 \% \\
-+
+$2\mu1e$   &  19.6 \%  &  0.0208 \%  &  5.56 \%  &  0 \%  &  0.18 \% \\
-+
+$3\mu$     &  0 \%  &  23.4 \%  &  0.0573 \%  &  6.77 \%  &  0.0164 \% \\
-+
+\hline \hline
-+
+\end{tabular}
-+
+\end{center}
-+
+\caption{Selection efficiency for signal events in the four selection channels for the different
-+
+  generated \W and \Z decay channels.}
-+
+\label{tab:wz-effimatrix}
-+
-+
+%\end{table}
-+
+%\begin{table}[tbp]
-+
+\begin{center}
-+
+\begin{tabular}{llcc} \hline
-+
+  & & \multicolumn{2}{c}{Generated decay:} \\
-+
+  & & \multicolumn{2}{c}{$Z \to ee $} \\
-+
+Selection channel  &    &  $W \to e$   &  $W \to \mu$ \\ \hline
-+
+\hline \hline
-+
+\multicolumn{4}{c}{all} \\ \hline
-+
+$3e$        & all & 1644         & 3    \\
-+
+$3e$        & matched Z & 0.937+/-0.00598 & 1+/-0\\
-+
+$3e$        & matched W & 0.915+/-0.00688 & 0+/--1\\
-+
+$3e$        & matched WZ & 0.914+/-0.00691 & 0+/--1\\
-+
+\hline \hline
-+
+\multicolumn{4}{c}{exactly 1 W lepton candidate} \\ \hline
-+
+$3e$        & all & 1602         & 0    \\
-+
+$3e$        & matched Z & 0.938+/-0.00604 & -1+/--1\\
-+
+$3e$        & matched W & 0.915+/-0.00696 & -1+/--1\\
-+
+$3e$        & matched WZ & 0.914+/-0.00699 & -1+/--1\\
-+
+\hline \hline
-+
+\multicolumn{4}{c}{more than 1 W lepton candidate} \\ \hline
-+
+$3e$        & all & 42   & 3    \\
-+
+$3e$        & matched Z & 0.929+/-0.0397 & 1+/-0\\
-+
+$3e$        & matched W & 0.905+/-0.0453 & 0+/--1\\
-+
+$3e$        & matched WZ & 0.905+/-0.0453 & 0+/--1\\
-+
+\hline \hline
-+
+\multicolumn{4}{c}{all} \\ \hline
-+
+$2e1\mu$   & all & 0     & 1746 \\
-+
+$2e1\mu$   & matched Z & -1+/--1 & 0.999+/-0.000573\\
-+
+$2e1\mu$   & matched W & -1+/--1 & 1+/-0\\
-+
+$2e1\mu$   & matched WZ & -1+/--1 & 0.999+/-0.000573\\
-+
+\hline \hline
-+
+\multicolumn{4}{c}{exactly 1 W lepton candidate} \\ \hline
-+
+$2e1\mu$   & all & 0     & 1715 \\
-+
+$2e1\mu$   & matched Z & -1+/--1 & 0.999+/-0.000583\\
-+
+$2e1\mu$   & matched W & -1+/--1 & 1+/-0\\
-+
+$2e1\mu$   & matched WZ & -1+/--1 & 0.999+/-0.000583\\
-+
+\hline \hline
-+
+\multicolumn{4}{c}{more than 1 W lepton candidate} \\ \hline
-+
+$2e1\mu$   & all & 0     & 31   \\
-+
+$2e1\mu$   & matched Z & -1+/--1 & 1+/-0\\
-+
+$2e1\mu$   & matched W & -1+/--1 & 1+/-0\\
-+
+$2e1\mu$   & matched WZ & -1+/--1 & 1+/-0\\ \hline \hline
-+
+\end{tabular}
-+
+\end{center}
-+
+\caption{Fractions of events with correctly matched leptons
-+
+  to true decay product of \W and \Z decays for final states
-+
+  with generated $\Z\to ee$ decays}
-+
+\label{tab:wz-matcheffi-Zee}
-+
+\end{table}
-+
-+
-+
-+
+\begin{table}[tbp]
-+
+\begin{center}
-+
+\begin{tabular}{llcc} \hline
-+
+  & & \multicolumn{2}{c}{Generated decay:} \\
-+
+ & & \multicolumn{2}{c}{$Z \to \mu\mu $} \\
-+
+Selection channel  &    &  $W \to e$   &  $W \to \mu$
-+
+\\ \hline
-+
+\hline \hline
-+
+\multicolumn{4}{c}{all} \\ \hline
-+
+$2\mu1e$   & all & 1895  & 2    \\
-+
+$2\mu1e$   & matched Z & 1+/-0 & 1+/-0\\
-+
+$2\mu1e$   & matched W & 0.985+/-0.00282 & 0+/--1\\
-+
+$2\mu1e$   & matched WZ & 0.985+/-0.00282 & 0+/--1\\
-+
+\hline \hline
-+
+\multicolumn{4}{c}{exactly 1 W lepton candidate} \\ \hline
-+
+$2\mu1e$   & all & 1847  & 0    \\
-+
+$2\mu1e$   & matched Z & 1+/-0 & -1+/--1\\
-+
+$2\mu1e$   & matched W & 0.986+/-0.00274 & -1+/--1\\
-+
+$2\mu1e$   & matched WZ & 0.986+/-0.00274 & -1+/--1\\
-+
+\hline \hline
-+
+\multicolumn{4}{c}{more than 1 W lepton candidate} \\ \hline
-+
+$2\mu1e$   & all & 48    & 2    \\
-+
+$2\mu1e$   & matched Z & 1+/-0 & 1+/-0\\
-+
+$2\mu1e$   & matched W & 0.938+/-0.0349 & 0+/--1\\
-+
+$2\mu1e$   & matched WZ & 0.938+/-0.0349 & 0+/--1\\
-+
+\hline \hline
-+
+\multicolumn{4}{c}{all} \\ \hline
-+
+$3\mu$     & all & 0     & 2251 \\
-+
+$3\mu$     & matched Z & -1+/--1 & 0.943+/-0.00488\\
-+
+$3\mu$     & matched W & -1+/--1 & 0.933+/-0.00526\\
-+
+$3\mu$     & matched WZ & -1+/--1 & 0.933+/-0.00526\\
-+
+\hline \hline
-+
+\multicolumn{4}{c}{exactly 1 W lepton candidate} \\ \hline
-+
+$3\mu$     & all & 0     & 2207 \\
-+
+$3\mu$     & matched Z & -1+/--1 & 0.944+/-0.0049\\
-+
+$3\mu$     & matched W & -1+/--1 & 0.934+/-0.00529\\
-+
+$3\mu$     & matched WZ & -1+/--1 & 0.934+/-0.00529\\
-+
+\hline \hline
-+
+\multicolumn{4}{c}{more than 1 W lepton candidate} \\ \hline
-+
+$3\mu$     & all & 0     & 44   \\
-+
+$3\mu$     & matched Z & -1+/--1 & 0.909+/-0.0433\\
-+
+$3\mu$     & matched W & -1+/--1 & 0.909+/-0.0433\\
-+
+$3\mu$     & matched WZ & -1+/--1 & 0.909+/-0.0433\\ \hline \hline
-+
+\end{tabular}
-+
+\end{center}
-+
+\caption{Fractions of MC \WZ events with correctly matched leptons
-+
+  to true decay product of \W and \Z decays for final states
-+
+  with generated $\Z\to \mu\mu$ decays}
-+
+\label{tab:wz-matcheffi-Zmumu}
-+
+\end{table}
-+
-+
-+
+%\subsection{Signal extraction}
-+
+%\input D0Matrix
-+
+\input zjetbackground
-+
-+
-+
+\section{Systematic uncertainties}
-+
+\input Sys
-+
-+
-+
+\begin{figure}[bt]
-+
+  \begin{center}
-+
+  \scalebox{0.8}{\includegraphics{figs/met_by_channel.eps}}
-+
+  \caption{Missing transverse mass for the four signal categories.
-+
+    The distributions  show the number of expected events
-+
+    for $1 fb^{-1}$. Only events with 81.1 GeV $< M_Z < $ 101.1 \gev
-+
+    are shown. All selection cuts are applied.}
-+
+  \label{fig:met}
-+
+  \end{center}
-+
+\end{figure}
-+
-+
+\begin{figure}[bt]
-+
+  \begin{center}
-+
+  \scalebox{0.8}{\includegraphics{figs/mtw_by_channel.eps}}
-+
+  \caption{W transverse mass for the four signal categories.
-+
+    The distributions  show the number of expected events
-+
+    for $1 fb^{-1}$. Only events with 81.1 GeV $< M_Z < $ 101.1 GeV are shown.
-+
+    All selection cuts are applied.}
-+
+  \label{fig:mtw}
-+
+  \end{center}
-+
+\end{figure}

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Comparing UserCode/Vuko/Notes/WZCSA07/selection.tex (file contents): Revision 1.1 by vuko, Wed Jun 11 15:18:44 2008 UTC vs. Revision 1.11 by vuko, Sun Jun 22 23:14:53 2008 UTC

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Comparing UserCode/Vuko/Notes/WZCSA07/selection.tex (file contents):
Revision 1.1 by vuko, Wed Jun 11 15:18:44 2008 UTC vs.
Revision 1.11 by vuko, Sun Jun 22 23:14:53 2008 UTC