| 22 |
|
with one real lepton and one fake lepton are estimated by |
| 23 |
|
selecting one lepton passing the full lepton selection |
| 24 |
|
and one failing it but passing the FO selection. |
| 25 |
< |
Backgrounds with two fake leptons are estimated by requiring |
| 25 |
> |
Backgrounds with two fake leptons (QCD) are estimated by requiring |
| 26 |
|
both lepton candidates to pass the FO selection and fail |
| 27 |
|
the full selection. |
| 28 |
< |
\item Each event is weighted by FR/(1-FR), where FR is the Fake |
| 29 |
< |
Rate for the FO in the event. In case of two FO, we take the |
| 30 |
< |
weight as the product of the two FR/(1-FR) for the two FO. |
| 28 |
> |
\item For the QCD backgrounds considered in this note, |
| 29 |
> |
each event is weighted by the product of the two factors |
| 30 |
> |
of FR/(1-FR), where FR is the Fake |
| 31 |
> |
Rate for each of the two FO. |
| 32 |
|
\item The sum of the weights over the selected events is the |
| 33 |
|
background prediction. |
| 34 |
|
\end{itemize} |
| 113 |
|
The FR are measured as a function of $P_T$ and $|\eta|$. |
| 114 |
|
The FR projections on the $P_T$ and $|\eta|$ axes for the muon FR and for |
| 115 |
|
the three (V1, V2, V3) electron FR in the different trigger samples |
| 116 |
< |
are displayed in Figures~\ref{fig:muFR} and~\ref{fig:eleFR}. |
| 116 |
> |
are displayed in |
| 117 |
> |
{\color{red} Figures~\ref{fig:muFR} and~\ref{fig:eleFR} (old)} and |
| 118 |
> |
{\color{blue}Figures~\ref{fig:muFR2} and~\ref{fig:eleFR2} (new)}. |
| 119 |
> |
|
| 120 |
|
|
| 121 |
|
|
| 122 |
|
\begin{figure}[htb] |
| 123 |
|
\begin{center} |
| 124 |
+ |
{\color{red} |
| 125 |
|
\includegraphics[width=0.48\linewidth]{MuFakeRatesJune1.pdf} |
| 126 |
|
\includegraphics[width=0.48\linewidth]{muFReta.pdf} |
| 127 |
|
\caption{\label{fig:muFR}The muon fake rate as a function of $P_T$ |
| 128 |
< |
and $|\eta|$ in the different jet samples.} |
| 128 |
> |
and $|\eta|$ in the different jet samples. (Old plots updated below).} |
| 129 |
> |
} |
| 130 |
> |
\end{center} |
| 131 |
> |
\end{figure} |
| 132 |
> |
|
| 133 |
> |
|
| 134 |
> |
|
| 135 |
> |
\begin{figure}[htb] |
| 136 |
> |
\begin{center} |
| 137 |
> |
{\color{blue} |
| 138 |
> |
\includegraphics[width=0.31\linewidth, angle=90]{MuFakeRatesJuly7.pdf} |
| 139 |
> |
\includegraphics[width=0.31\linewidth, angle=90]{muFReta7July.pdf} |
| 140 |
> |
\caption{\label{fig:muFR2}The muon fake rate as a function of $P_T$ |
| 141 |
> |
and $|\eta|$ in the different jet samples. Note that these now start at |
| 142 |
> |
$P_T=$ 10 GeV instead of $P_T=$5 GeV as they did in the earlier analysis |
| 143 |
> |
because of a preselection aplied in our data handling. For this reason |
| 144 |
> |
the $\eta$-projections cannot be directly compared since the this is |
| 145 |
> |
dominated by muons of $P_T$ near threshold. Note also that the |
| 146 |
> |
muon identification requirements have changed a little bit, as |
| 147 |
> |
described in Section 3.1.5. (New updated plots).} |
| 148 |
> |
} |
| 149 |
|
\end{center} |
| 150 |
|
\end{figure} |
| 151 |
|
|
| 152 |
+ |
|
| 153 |
+ |
|
| 154 |
|
\begin{figure}[htb] |
| 155 |
|
\begin{center} |
| 156 |
+ |
{\color{red} |
| 157 |
|
\includegraphics[width=\linewidth]{ElFakeRatesJune1.pdf} |
| 158 |
|
\includegraphics[width=\linewidth]{eFReta.pdf} |
| 159 |
|
\caption{\label{fig:eleFR}The electron fake rates |
| 160 |
|
(V1,V2,V3) as a function of $P_T$ and $|\eta|$ |
| 161 |
< |
in the different jet samples.} |
| 161 |
> |
in the different jet samples. (Old plots updated below).} |
| 162 |
> |
} |
| 163 |
> |
\end{center} |
| 164 |
> |
\end{figure} |
| 165 |
> |
|
| 166 |
> |
|
| 167 |
> |
|
| 168 |
> |
\begin{figure}[htb] |
| 169 |
> |
\begin{center} |
| 170 |
> |
{\color{blue} |
| 171 |
> |
\includegraphics[width=0.4\linewidth,angle=90 ]{ElFakeRatesJuly7.pdf} |
| 172 |
> |
\includegraphics[width=0.4\linewidth,angle=90]{eFRetaJuly7.pdf} |
| 173 |
> |
\caption{\label{fig:eleFR2}The electron fake rates |
| 174 |
> |
(V1,V2,V3) as a function of $P_T$ and $|\eta|$ |
| 175 |
> |
in the different jet samples. |
| 176 |
> |
Note that the spike removal has been added to the electron |
| 177 |
> |
selection since the earlier analysis. This is a very |
| 178 |
> |
small effect. (New updated plots).} |
| 179 |
> |
} |
| 180 |
|
\end{center} |
| 181 |
|
\end{figure} |
| 182 |
|
|
| 183 |
+ |
|
| 184 |
|
The fake rates are reasonably stable with respect to |
| 185 |
|
jet trigger variations, within the $\approx 50\%$ which |
| 186 |
|
we believe to be a realistic goal for the FR systematics. |
| 195 |
|
as we collect more data. In any case, the |
| 196 |
|
FR does not appear to change very fast as a function of $P_T$. |
| 197 |
|
|
| 198 |
+ |
|
| 199 |
+ |
\clearpage |
| 200 |
+ |
|
| 201 |
+ |
\subsection{Loosening the isolation requirement for the muon FO} |
| 202 |
+ |
Loosening the isolation requirement for the muon FO would reduce the |
| 203 |
+ |
muon FR. This is in general ``a good thing''\texttrademark. |
| 204 |
+ |
However, the price one then pays is that the jet dependence of the |
| 205 |
+ |
FR increases. This is illustrated in Figure~\ref{fig:FRlooseIso}. |
| 206 |
+ |
|
| 207 |
+ |
In the $P_T \approx 8$ GeV bin, the ratio of FR in the two extreme triggers |
| 208 |
+ |
(HLT\_L1Jet6U and HLT\_Jet30U) increases from 1.6 (FO-Iso $<$ 0.4) to 2.0 |
| 209 |
+ |
(FO-Iso $<$ 0.6) to 2.4 (FO-Iso $<$ 0.8) to 2.9 (FO-Iso $<$ 1.0). Given this |
| 210 |
+ |
behavior, for now we keep the FO isolation requirement to 0.4. |
| 211 |
+ |
|
| 212 |
+ |
\begin{figure}[htb] |
| 213 |
+ |
\begin{center} |
| 214 |
+ |
\includegraphics[width=0.7\linewidth,angle=90]{muonFR_differentIso.pdf} |
| 215 |
+ |
\caption{\label{fig:FRlooseIso}Muon FR as a function of $P_T$ in different |
| 216 |
+ |
trigger samples for different choices of the maximum isolation |
| 217 |
+ |
requirement on the muon FO (0.4, 0.6, 0.8, 1.0).} |
| 218 |
+ |
\end{center} |
| 219 |
+ |
\end{figure} |
| 220 |
+ |
|
| 221 |
+ |
|
| 222 |
|
\subsection{Bias due to lepton triggers?} |
| 223 |
|
Another possible bias is related to the fact that events used to |
| 224 |
|
measure the FR are collected with jet triggers. On the other hand |
| 262 |
|
The statistics are not very good, but the lepton trigger bias |
| 263 |
|
does not seem to be a significant effect. We tentatively neglect it. |
| 264 |
|
|
| 265 |
+ |
\clearpage |
