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\section{Trigger efficiency}
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\label{sec:trgEff}
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As described in Section~\ref{sec:trigSel} we rely on a
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mixture of single and double lepton triggers. The trigger
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efficiency is very high because for most of the phase space
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we have two leptons each of which can fire a single lepton
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trigger -- and the single lepton triggers are very efficient.
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We apply to MC events a simplified model of the trigger efficiency
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as a function of dilepton species ($ee$, $e\mu$, $\mu\mu$), the $P_T$
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of the individual leptons, and, in the case of muons, the $|\eta|$
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of the muons. We believe that this model is adequate for
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the trigger efficiency precision needed for this analysis.
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Details are given in Appendix~\ref{sec:appendix_trigger}.
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We take the trigger efficiency for $ee$ as 100\%. The trigger efficiency
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for the $e\mu$ and $\mu\mu$ final states is summarized in
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Figures~\ref{fig:emuModel} and~\ref{fig:mumuModel}.
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We estimate the systematic uncertainties on the trigger modeling
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to be at the few percent level.
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{\color{red} \bf The trigger efficiency model will be applied when
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we move to 38x Monte Carlo. For now, we take the efficiency as 100\%.}
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