| 12 |
|
Nevertheless, we can make general statements about the |
| 13 |
|
systematic uncertainties, including quantitative |
| 14 |
|
estimates of the systematic uncertainties associated with |
| 15 |
< |
a few specific processes. |
| 15 |
> |
a few specific processes. Bote that we have used Spring10 |
| 16 |
> |
MC for the studies of systematic uncertainties described in this section. |
| 17 |
|
|
| 18 |
|
The systematic uncertainty on the lepton acceptance consists |
| 19 |
|
of two parts: the trigger efficiency uncertainty and the |
| 20 |
< |
ID and isolation of uncertainty. We discuss these in turn. |
| 20 |
> |
ID and isolation uncertainty. We discuss these in turn. |
| 21 |
|
|
| 22 |
|
The trigger efficiency |
| 23 |
|
for two leptons of $P_T>10$ GeV, with one lepton of |
| 24 |
|
$P_T>20$ GeV is very high, except in some corners |
| 25 |
< |
of phase space, see Section~\ref{sec:trgEff}. |
| 25 |
> |
of phase space, see Section~\ref{sec:trgeffsum}. |
| 26 |
|
We estimate the efficiency uncertainty to be a few percent, |
| 27 |
|
mostly in the low $P_T$ region. |
| 28 |
|
|
| 29 |
|
\begin{figure}[tbh] |
| 30 |
|
\begin{center} |
| 31 |
|
\includegraphics[width=1.0\linewidth]{eff_35.png} |
| 32 |
+ |
\includegraphics[width=1.0\linewidth]{isoEff.png} |
| 33 |
|
\caption{\label{fig:effttbar}\protect |
| 34 |
|
Identification and isolation efficiencies for |
| 35 |
|
leptons from $t \to W \to \ell$ and |
| 66 |
|
the final state. For example, in MC we find that the |
| 67 |
|
lepton isolation efficiency differs by $\approx 4\%$ |
| 68 |
|
{\bf per lepton} between $Z$ events and $t\bar{t}$ events\cite{ref:top}. |
| 69 |
< |
\noindent {\bf This figure should be cut off at 100 GeV, and |
| 70 |
< |
the y-axis should be zero-suppressed} |
| 69 |
> |
%\noindent {\bf This figure should be cut off at 100 GeV, and |
| 70 |
> |
%the y-axis should be zero-suppressed} |
| 71 |
|
|
| 72 |
|
Another significant source of systematic uncertainty is |
| 73 |
|
associated with the jet and $\met$ energy scale. The impact |
