Check how corrected track pt will affect jet pt and dijet mass ...

I want to see how correcting the high pt track problem in the FF part of the run could affect the observables I will use in my analysis. I use the gaussian correction scheme described here to correct the track pts from sectors 4, 5, and 20. I use the current jet trees and only correct tracks from the FF part of the run and from the high pt jet as identified by my dijet algorithm. Using the current jet trees means that this analysis will not capture potential changes in jet thrust axis that would arise if the track pt was corrected before the jet finder was run.

Figure 1: This figure compares the track pt spectra before and after the gaussian correction was applied. I have corrected the three most distorted sectors, the top two plots show sector 4, the middle two plots show sector 5, and the bottom two plots show sector 20. The black curve shows the RFF track spectrum, the red curve shows the FF spectrum before I apply my correction, and the blue curve shows the FF spectrum after I apply my correction. For each sector, the top plot shows positive charge sign tracks and the bottom plot shows negative tracks.

As the plots above show, the corrections I apply do a good job matching the FF spectra to the RFF spectra which appears to be more behaved. 

Up to now, the work I've done on the high pt track problem has focused on how the track pt spectra are distorted and on how to correct them. Ultimately, I am doing a jet based analysis and I would like to know how jet properties change as I correct the track pt. NOTE: As mentioned above, since I am working with the current jet trees, this analysis can only look at changes in jet pt.

Figure 2: This figure shows the jet pt after I have applied my track correction vs the jet pt before I have applied the correction. The figure contains only high pt jets from the FF part of the run. The large concentration along the diagonaly come from jets which had no tracks in sectors 4, 5, or 20 and therefore have no correction applied.

Figure 3: This figure shows jet phi vs jet pt. The plots show jets from the entire run period (RFF+FF). The top left plot shows the high pt jets before my correction was applied, the top right plot shows the high pt jets after my correction was applied, and the bottom plot shows the low pt jets (no correction was applied to low pt jets).

Figure 4: This figure shows how the high pt jet spectrum changes when I apply my correction. The black curve is the low pt jet spectrum for reference, the red curve is the high jet pt spectrum before I apply my correction, and the blue curve is the high jet pt spectum after the correction is applied. This figure includes jets from both field configurations (RFF+FF).

Figure 5: This figure again shows how the high jet spectrum changes after I apply my correction. Here I compare the RFF high jet spectrum (black) to the uncorrected FF high jet spectrum (red) and the corrected FF high jet spectrum (blue). (Red and Blue curves normalized by integral to Black).

The plots above show that the track corrections I have applied reduce the high jet high pt tail but do not eliminate it completely. We see from figure 5 that the corrections I apply make the FF high jet pt spectra look more like the RFF high jet pts spectra.

Figure 6: This figure shows the low jet pt vs the high jet pt. The top pannel shows jets after my correction has been applied. The bottom plot shows jets before my correction and is from my original investigation. (A plot showing jets after the correction with an expanded pt range can be found here). This figure contains runs from both field configurations (RFF+FF).

Figure 7: This figure shows the away side jet pt vs the same side jet pt. The top pannel shows jets after my correction has been applied. The bottom plot shows jets before my correction and is from my original investigation. (A plot showing jets after the correction with an expanded pt range can be found here.) This figure contains runs from both field configurations (RFF+FF).

Figure 8: This figure compares the dijet invariant mass spectrum before my correction (Red) and after after the correction was applied (Blue). The bottom pannel shows the Uncorrected minus the corrected spectrum divided by the corrected as a function of mass. Note that the invariant mass difference only takes into account differing jet pt arising from my track correction, not any differences in jet thrust axis. This figure contains runs from both field configurations (RFF+FF).

Figure 9: This figure shows the jet neutral fraction (Rt) vs jet pt. The plots show jets from the entire run period (RFF+FF). The top left plot shows the high pt jets before my correction was applied, the top right plot shows the high pt jets after my correction was applied, and the bottom plot shows the low pt jets (no correction was applied to low pt jets). A plot of the 1-D Rt spectrum can be found here. This figure contains runs from both field configurations (RFF+FF).

Figure 10: This figure shows the number of tracks (top three plots) and the number of towers (bottom three plots) in the jet vs jet pt. In each group of three plots the top left plot shows the high pt jets before my correction was applied, the top right plot shows the high pt jets after my correction was applied, and the bottom plot shows the low pt jets (no correction was applied to low pt jets). This figure contains runs from both field configurations (RFF+FF).