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%\subsection{Non $t\bar{t}$ Backgrounds} |
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%\label{sec:othBG} |
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Backgrounds in which one or both leptons do not originate from electroweak decays (non-$W/Z$ leptons) |
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are assessed using the method of Ref.~\cite{ref:top}. |
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A non-$W/Z$ lepton is a lepton candidate originating from within a jet, |
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such as a lepton from semileptonic $b$ or $c$ decays, a muon decay-in-flight, a pion misidentified |
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as an electron, or an unidentified photon conversion. |
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Estimates of the contributions to the signal region from pure |
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multijet QCD, with two non-$W/Z$ leptons, and in $W+\mathrm{jets}$, |
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with one non-$W/Z$ lepton in addition to the lepton from the decay of the $W$, are |
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derived separately. We find $0.00^{+0.04}_{-0.00}$ and $0.0^{+0.4}_{-0.0}$ for the multijet |
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QCD and $W$+jets contributions respectively, |
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and thus consider these backgrounds to be negligible. |
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Backgrounds in which one or both leptons do not originate from |
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electroweak decays (fake leptons) are assessed using the method |
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of Ref.~\cite{ref:top}. A fake lepton is a lepton candidate |
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originating from within a jet, such as a lepton from semileptonic $b$ |
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or $c$ decays, a muon decay-in-flight, a pion misidentified as an |
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electron, or an unidentified photon conversion. Estimates of the |
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contributions to the signal region from pure multijet QCD, with two |
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fake leptons, and in $W+\mathrm{jets}$, with one fake lepton |
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in addition to the lepton from the decay of the $W$, are derived |
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separately. We find $0.00^{+0.04}_{-0.00}$ and $0.0^{+0.5}_{-0.0}$ |
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($0.00^{+0.04}_{-0.00}$ and $0.5 \pm 0.5$) |
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for the multijet QCD and $W$+jets contributions to the high \MET\ |
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(high \Ht) signal regions, respectively, and thus |
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consider these backgrounds to be negligible. |
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Backgrounds from DY and from processes with two vector bosons and single top |
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Backgrounds from DY are estimated with the data-driven $R_{out/in}$ technique~\cite{ref:top}, |
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which leads to an estimated DY contribution which is consistent with 0. |
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Backgrounds from processes with two vector bosons and single top |
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are negligible compared to dilepton $t\bar{t}$. |
