Tracking StatusJan. 30, 2006
Elton ran the momres program with conditions equivalent to throwing 1GeV π+s at 90o. The four plots below show the result of the momres calculation (lines) and the result of GEANT simulation with track fitting.
The next set of plots shows the residuals(X-axis) for the CDC, FDC Andode, and FDC Cathode as a function of layer(Y-axis). The first set is with no smearing of the positions (through smearing of the drift times). The second set is with a smearing equivalent to 200%mu;m. The residuals are calculated as the difference between the distance as caclculated from the (smeared) drift time and the DOCA (distance of closest approach) of the track after fitting. --- MULS. OFF ---
These next two plots show the projections of the above sets onto the X-axis. The CDC, FDC Anode and FDC Cathode are superimposed on one another. --- MULS. OFF ---
These plots show the effect of replacing the downstream CDC endplate with Air. The effect is small. This seems consistent with the parametic Monte Carlo results from GlueX-doc-681
Here is the momentum resolution by a slightly earlier version of the fitter that shows the effect of FDC packages for a certain kinematic region.
These plots show the momentum resolution dependance on the chamber position resolution for a few different kinematic points.
This last plot is of the momentum resolution as a function of momentum using the track fitter and geant data smeared by various amounts. --- MULS. OFF ---
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