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Fractional resolution as a function of |h|. Also this data shows only the electrons which fit into the energy range (100 < E < 150).Each line corresponds to a different level of pile up. This shows the slope and progression of different levels of pile up as data is taken from low to high |h| values. The final value for Pile up 60 in high |h| was a bad fit and I believe does not represent a physical trend.
Shown here is the next energy band up (150 < E < 225). Each energy band is the low end to 150% of the low end, causing the bands to grow in relative range. This plot depects the same fractional energy resolution vs |h| for the same pile up levels. The higher energy energy band has two large effects. Because the range is larger for this set there are more events which fall into it. This causes better fits and reduced errors. Also the general trend that with higher energy electrons the frectional energy difference caused by pile up will be reduced. This is the effect that I sought to quantify.
The higher energy band shown here gives electrons with yet higher resolution.
This data is as expected fron the hypothesis that highter energy elecrons will have better resolution in the presence of non-trival pile up.
Within this energy range pile up 40 at high |h| stays within 5% resolution.
Within this energy band pile up 60 now stays within 5% resolution. Somewhere around 1 TeV there is a problem with ECAL leaking energy to the HCAL and more sophisticated identification techniques are required.
