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User name Chao
Log entry time 02:21:53 on March 12, 2012
Entry number 365847
keyword=Roughly estimation of the statistical uncertainty of charge asymmetry of run 22194The scripts we used to make the plot has a typo and I updated the correct plot here.
We haven't applied the BCM calibration to the calculation yet so the mean value may have a significant system error. Pengjia and I will try to put the constant into the calculation and get a more accurate value. However, the purpose we test this charge asymmetry is to make sure we can reach an statistical uncertainty of <100ppm with an 15 min run.
For this particular run 22194, the event amount is about 10M and it took around 30 min. I use first 5M events (15 min) to make this plot. We can estimate the statistical uncertainty of the mean value like this: RMS/Sqrt(entries)=0.0019/Sqrt(2094)=42ppm. So we can conclude that the statistical uncertainty can reach <100ppm in 15 min.
A copy of this log entry has been emailed to: pzhu, kalyan, cammsone, cg2ja, jpchen, slifer
Figure 1
