| 9 |
|
Strictly speaking it is impossible to talk about |
| 10 |
|
``acceptance systematics'' because these kinds of |
| 11 |
|
systematics only apply to a well defined final state. |
| 12 |
< |
nevertheless, we can make at least make some qualitative |
| 12 |
> |
Nevertheless, we can at least make some qualitative |
| 13 |
|
statements. |
| 14 |
|
|
| 15 |
< |
The systematic uncertainty on the letpon acceptance consists |
| 15 |
> |
The systematic uncertainty on the lepton acceptance consists |
| 16 |
|
of two parts: the trigger efficiency uncertainty and the |
| 17 |
|
ID and isolation of uncertainty. We discuss these in turn. |
| 18 |
|
|
| 23 |
|
We estimate the efficiency uncertainty to be a few percent, |
| 24 |
|
mostly in the low $P_T$ region. |
| 25 |
|
|
| 26 |
< |
The ID efficiency in MC is shown in {\color{red} Figuer XX and |
| 27 |
< |
YY} for the leptons from $t \to W \to \ell$ and $t \to W \to \tau \to \ell$. |
| 26 |
> |
\begin{figure}[tbh] |
| 27 |
> |
\begin{center} |
| 28 |
> |
\includegraphics[width=0.75\linewidth]{eff_11.png} |
| 29 |
> |
\caption{\label{fig:effttbar}\protect |
| 30 |
> |
Identification and isolation efficiencies for |
| 31 |
> |
leptons from $t \to W \to \ell$ and |
| 32 |
> |
$t \to W \to \tau \to \ell$ in |
| 33 |
> |
$t\bar{t}$ events.} |
| 34 |
> |
\end{center} |
| 35 |
> |
\end{figure} |
| 36 |
> |
|
| 37 |
> |
|
| 38 |
> |
The ID efficiencies in MC are shown in |
| 39 |
> |
Figures~\ref{fig:effttbar} |
| 40 |
> |
for the leptons from $t \to W \to \ell$ and $t \to W \to \tau \to \ell$. |
| 41 |
|
Tag and probe studies show that these are correct to about |
| 42 |
|
{\color{red} xx\%. (We need to do tag-and-probe on the full sample, |
| 43 |
|
see what we get, and write text accordingly).} |
