| 6 |
|
dilepton sample. The choice of signal region is driven by |
| 7 |
|
three observations: |
| 8 |
|
\begin{enumerate} |
| 9 |
< |
\item astrophisical evidence for dark matter suggests that |
| 9 |
> |
\item astrophysical evidence for dark matter suggests that |
| 10 |
|
we concentrate on the region of high \met; |
| 11 |
|
\item new physics signals should have high $\sqrt{\hat{s}}$; |
| 12 |
|
\item observable high cross section new physics signals |
| 17 |
|
Following these observations, we add the following two requirements |
| 18 |
|
to the preselection of Section~\ref{sec:eventSel}: |
| 19 |
|
\begin{center} |
| 20 |
< |
SumJetPt$>$300 GeV and $\met/\sqrt{\rm SumJetPt} > 8.5$. |
| 20 |
> |
$\mathrm{SumJetPt}>300$~GeV and $\met/\sqrt{\rm SumJetPt} > 8.5$~GeV$^{1/2}$. |
| 21 |
|
\end{center} |
| 22 |
|
|
| 23 |
|
\noindent This selection preserves about 1\% of the $t\bar{t}$ |
| 24 |
< |
signal. We cut on \met$/\sqrt{\rm SumJetPt}$ rather than \met |
| 25 |
< |
because the variables \met and \met$/\sqrt{\rm SumJetPt}$ are |
| 24 |
> |
signal, giving an expected total SM yield of 1.4 events in 35 pb$^{-1}$ |
| 25 |
> |
The expectations from the LMO and LM1 SUSY benchmark points are 6.5 and |
| 26 |
> |
2.6 events respectively. |
| 27 |
> |
|
| 28 |
> |
|
| 29 |
> |
We cut on \met$/\sqrt{\rm SumJetPt}$ rather than \met |
| 30 |
> |
because the variables SumJetPt and \met$/\sqrt{\rm SumJetPt}$ are |
| 31 |
|
largely uncorrelated for the dominant $t\bar{t}$ background. |
| 32 |
|
This allows us to use a data driven ABCD method to estimate the |
| 33 |
|
background (see Section~\ref{sec:abcd}). |
