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benhoob |
1.1 |
%\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 from DY and from processes with two vector bosons and single top
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are negligible compared to dilepton $t\bar{t}$.
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