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In this note a deep review of the current official criteria for |
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ElectronID have been performed. This study has been done using $WZ |
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\rightarrow e^\pm \nu \mu^+ \mu^-$ where the $Z$ decaying into muons |
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will serve to select the event. The main background for such analysis |
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is $Z+jets$ production. Using the official robust cuts for this |
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analysis, we end up with a significance for 1fb$^{-1}$ of the order of |
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0.9. Taking such criteria as a starting point, new threshold have been |
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designed first to improve the significance of such channel then new |
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variable have been studied in order to select isolated electrons. With |
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this simple criteria which are using 6 variables with 2 set of |
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threshold (one for barrel, the second for endcap), we end up on the |
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same channel with a significance of 3.7 for 1fb$^{-1}$ integrated |
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luminosity. |
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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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|
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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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|
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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. |
