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The CR studies described in this Section are key to validating the
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background predictions. The CRs are defined in Section~\ref{sec:CR}.
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C1 and CR2 are designed to test the $M_T$ tail in $W +$ jets and
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\ttbar\ respectively. Note that, as explained in Section~\ref{sec:ljbg-general},
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these tails are different in the two samples because the off-shell effects
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are much more pronounced for $W +$ jets. (The s- and t-channel single
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top has the same $M_T$ tail as \ttbar\ ). To put things in perspective,
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keep in mind that these
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backgrounds are only about 15\% of the total, see Table~\ref{tab:srrawmcyields}.
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CR4 and CR5 address the dominant \ttbar\ dilepton background.
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In CR4 we test the $M_T$ tail in well identified dilepton events.
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In CR5 we test quantity, but in events where the second lepton is identified
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as an isolated track. Clearly CR4 and CR5 overlap. |
