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The resulting validation histograms for layers 0,1,3 and 7 are shown on the following plots:
On the histograms for all layers the new asymmetry calibration definitely improves the position resolution:
- for LEX1 range resolution is ~4 mm for old calibration and ~ 2mm for new calibration
- for HEX8 range resolution is ~13 mm for old calibration and ~9 mm for new calibration
There is significant population of events having much worse position resolution and creating non-gaussian tails. The origin of these effect is not clear. My initial suspect was shaped readout noise, but there is no correlation of position deviation with GemDeltaEventTime, as show on the following plot: