| 15 |
|
events is checked in a \ttll\ control sample, |
| 16 |
|
selected by requiring |
| 17 |
|
\begin{itemize} |
| 18 |
< |
\item exactly 2 selected electrons or muons with \pt $>$ 20 GeV |
| 18 |
> |
\item exactly 2 electrons or muons with \pt $>$ 20 GeV |
| 19 |
|
\item \met\ $>$ 50 GeV |
| 20 |
|
\item $\geq1$ b-tagged jet |
| 21 |
|
\item Z-veto ($|m_{\ell\ell} - 91| > 15$ GeV) |
| 50 |
|
It should be noted that in the case of \ttll\ events |
| 51 |
|
with a single reconstructed lepton, the other lepton may be |
| 52 |
|
mis-reconstructed as a jet. For example, a hadronic tau may be |
| 53 |
< |
mis-identified as a jet (since no $\tau$ identification is used). |
| 53 |
> |
misidentified as a jet (since no $\tau$ identification is used). |
| 54 |
|
In this case only 1 additional jet from radiation may suffice for |
| 55 |
|
a \ttll\ event to enter the signal sample. As a result, both the |
| 56 |
|
samples with $\ttbar+1$ jet and $\ttbar+\ge2$ jets are relevant for |
| 147 |
|
used, the MadGraph $K_3$ and $K_4$ are used, etc. |
| 148 |
|
% |
| 149 |
|
In order to do so, it is first necessary to count the number of |
| 150 |
< |
additional jets from radiation and exclude leptons mis-identified as |
| 151 |
< |
jets. A jet is considered a mis-identified lepton if it is matched to a |
| 150 |
> |
additional jets from radiation and exclude leptons misidentified as |
| 151 |
> |
jets. A jet is considered a misidentified lepton if it is matched to a |
| 152 |
|
generator-level second lepton with sufficient energy to satisfy the jet |
| 153 |
|
\pt\ requirement ($\pt>30~\GeV$). Then \ttll\ events that need two |
| 154 |
|
radiation jets to enter our selection are scaled by $K_4$, |
