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ymaravin |
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In this note we tried to summarize extensive studies of em-jet
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discriminating variables. We come to conclusion that variables
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that are utilized in the official ``Robust'' and ``Loose'' criteria
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are very effective to discriminate against misidentified jets,
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except for $E/p$ variable that we find less powerful than $E_{seed}/p_{out}$.
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We also indicate that complexity of ``Loose'' criteria can be
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substituted by a slight tightening of the thresholds, and similarly
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``Tight'' criteria's performance can be achieved by introducing
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a simple $H/E$ + ECAL isolation requirement that we refer to as $EMHAD$.
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This result in five-variable criteria compared with seven variables + isolation
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+ six categorization criteria.
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We also study the performance of various track, ECAL, and HCAL
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isolation requirements and come up with a few choices with optimal
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values of cone sizes.
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To summarize, a simple cut-based criteria is developed, mostly
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based on variables used in the official selection criteria that
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allows to achieve a significance of 3.7$\sigma$ in 1 fb$^{-1}$ of
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integrated luminosity in $WZ \rightarrow e \nu_e \mu^+\mu^-$
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channel alone.
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