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%\section{Definition of the signal region}
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%\label{sec:sigregion}
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%We define a signal region to look for possible BSM contributions
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%
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%The choice of signal region is driven by
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%three observations.
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%New physics signals should have high $\sqrt{\hat{s}}$.
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%Astrophysical evidence for dark matter suggests that
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%we concentrate on the region of high \MET.
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%High cross section new physics signals are likely to be produced
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%strongly; thus, we expect significant hadronic activity in conjunction with the two leptons.
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%by adding the following two requirements to the preselection described above:
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