Newest Cross Section Results

These are to be compared with the results from Oct 12th.  The difference is the inclusion of the BFC filter constribution to the trigger efficiency.  The plot marked (bFilt) in this other blog with more details are the actual numbers used, i.e. the values from Oct 12th are divided by the values in the (bFilt) plot.


Another way of looking at the data/theory comparison is the chi^2 per pT bin, i.e. ( data - theory )^2 / ( data uncertainty )^2 per bin.  The results are plotted below:


The overall chi^2 / ndf is 5.34549 / 6 = 0.890915, which is strongly skewed by the large uncertainty at high pT.  However, except the worst (lowest pT) bin has a chi^2 of 6.3, which is a 2.5 sigma effect.  The next highest bin (pT in 8-9 GeV) has a chi^2 of 2.9, which is a 1.7 sigma effect.  While the comparison between data and theory in the EEMC is not as good as similar comparisons for other detectors, it is not terrible.  Based on this blog, there does not seem to be anywhere else to look for missing factors on the order of 2 The forseen updates before final publication are:

• Possilby including a systematic on the reco efficiency related to missing material, based on the difference in the signal fractions between data and MC.
• Possibly decrease the uncertainty on the BFC filter's contribution to the trigger efficiency.