| 44 |
|
on studies of fake |
| 45 |
|
leptons in jet events. The second background, estimated from MC, consists of rare SM processes and is dominated |
| 46 |
|
by $t\bar{t}$W and $t\bar{t}$Z. The systematic uncertainty on both the fake lepton and rare backgrounds is 50\%. |
| 47 |
< |
A third, small background contribution is from ``charge flips'' and consists of events with opposite-sign leptons |
| 47 |
> |
A third, small background contribution is from ``charge flips'' and consists of events with opposite-sign (OS) leptons |
| 48 |
|
where one of the leptons is an electron whose charge is misreconstructed. |
| 49 |
< |
This background is estimated using the electron charge misreconstruction probability, which is extracted from studies of Z$\to e^+e^-$ events in data. |
| 49 |
> |
This background is estimated from an OS dilepton data sample, weighted by the electron charge misreconstruction probability, |
| 50 |
> |
which is extracted from studies of Z$\to$ee events in data and MC. |
| 51 |
|
%This background is based on MC predictions, which are validated using a sample of Z$\to e^+e^-$ events. |
| 52 |
|
|
| 53 |
< |
Signal regions are defined by placing additional requirements on the jet multiplicity, b-tagged jet multiplicity, |
| 53 |
> |
Several signal regions are defined by placing additional requirements on the jet multiplicity, b-tagged jet multiplicity, |
| 54 |
|
\met, and $H_T$, defined as the scalar sum of the transverse momenta of selected jets. |
| 55 |
|
The observed data yields in all signal regions are in good agreement with the SM background expectations; |
| 56 |
< |
see Ref.~\cite{ref:ss} for the full quantitative results. The signal region that is most sensitive to |
| 56 |
> |
see Ref.~\cite{ref:ss} for the full quantitative results. A signal region that is sensitive to |
| 57 |
|
bottom squark pair production with $\tilde{b}\to t \chim$ depicted in Fig.~\ref{fig:diagrams}(d) |
| 58 |
|
has at least four jets, \met\ $>$ 120 GeV and |
| 59 |
|
$H_T$ $>$ 200 GeV. In this region we observe 1 event in data and predict 2.22 $\pm$ 0.96 events. |
| 60 |
< |
The results are used to exclude a region of the model parameter space in Fig.~\ref{fig:ss_interpretation}(a), |
| 60 |
> |
The results in all signal regions are used to exclude a region of the model parameter space in Fig.~\ref{fig:ss_interpretation}(a), |
| 61 |
|
which demonstrates that our search probes bottom squarks with masses up to 450 GeV. |
| 62 |
< |
Naturalness considerations suggest a bottom squark with mass not exceeding 500--700 GeV, similar to the constraint |
| 62 |
> |
Naturalness considerations favor a bottom squark with mass not exceeding 500--700 GeV, similar to the constraint |
| 63 |
|
on the top squark mass. |
| 64 |
|
Several additional interpretations for models with gluino-mediated top and |
| 65 |
|
bottom squark production are presented in Ref.~\cite{ref:ss}. |
