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Additional background contributions from rare processes include
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\begin{itemize}
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\item \ttbar\ in association with a boson, \ttbar\ + \W\/\dy\ \\
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\item \dy+Jets \\
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\item diboson, \vv\ \\
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\item triboson, \vvv\ \\
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\item dilepton single top, \tw. \\
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\end{itemize}
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These backgrounds are small, contributing at the $\sim 5\%$ level and their predictions are taken
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from MC, normalized to the corresponding cross sections. A $50\%$ systematic uncertainty is
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assigned for all these backgrounds.
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Note that these backgrounds are not double-counted because the contribution to the \mt\ peak region
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is subtracted off when deriving the \mt\ peak data/MC scale factors. %HOOBERMAN: correct?
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Backgrounds from QCD are expected to be small in the signal regions with large \mt\ and \met.
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