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User name xqian
Log entry time 11:25:23 on January24,2009
Entry number 257578
keyword=Positron and Electron ComparisonBottom line is that the data looks reasonable.
See the plot
Clearly, the "electron cut" does not works well at low momentum. This can be seen as the enhancement in the positron run. (pi^+ leakage). In addition, the T1 trigger is really dominated by the pions.
Compared with T2 and T6, clearly, we see more electrons at high momentum end.
T5 is worse than the T6, This is due to the coincidence electron (L) + pi^+ (B) events. At this point, I would argue that the "lepton" sample still has huge pion contamination. If we cut at 1.5 GeV, the positron contamination is about 18% for the coincidence trigger. I did not cut the physics (e,pi^-) events.
FIGURE 1
