Investigation of Centroid Shift in Vz Differences

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In this section I will investigate the behavior of the central peak on the GenPart.z - Event.z histograms for different annular regions along an extended cylindrical target. While sifting through histograms that had been made, I noticed that there was a shift in the mean value as Z extends away from zero. Below is an example.

Vzdiff 0.0-R-0.1 0.0-Z-0.25.png VzDiff 0.9-R-1.0 -2.25-Z--2.0.png

Here it can be seen that near zero, the mean value is 0.08 cm, while in the histogram that places the cut further away from zero has a mean value of -1.693 cm. I will make histograms from a ROOT file generated by reconstructing a GEMC 2.5 evio file using Coat-Java 2.4.

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