J. Hamblen
University of Rochester
This study explores the degree to which sensor misalignment affects vertex resolution. Sensors in the top vertex detector were shifted in various ways in order to simulate a misalignment, and the residual difference between the the reconstructed vertex z position and the monte carlo z position was calculated for 500 events. The table below shows what sensors were shifted, the shift direction and amount, as well as the mean and sigma of the fitted residual histogram. A flat shift stands for an individual, random shifting of all sensors within the range of +/- 200 microns.
Sensor(s) |
Shift Amt. |
Shift Amt. |
Mean of Distribution |
Sigma of Distribution |
Unshifted |
0 |
0 |
-0.01491+-0.0017 |
-0.02081+-0.00126 |
VTA |
0.02 |
0 |
0.02505+-0.02489 |
0.0219+-0.02464 |
VTA |
0 |
0.02 |
0.004856+-0.004 |
0.04258+-0.00577 |
VTB |
-0.02 |
0 |
0.004627+-0.0019 |
0.02106+-0.0023 |
VTB |
0 |
-0.02 |
-0.009025+-0.002 | 0.02831+-0.00139 |
Flat Shift 1 |
[-0.02,0.02] |
0 |
-0.02363+-0.0029 |
0.02672+-0.00309 |
Flat Shift 2 |
[-0.02,0.02] |
0 |
-0.02076+-0.0022 |
0.02264+-0.00303 |
Flat Shift 3 |
0 |
[-0.02,0.02] |
-0.008962+-0.002 |
0.02579+-0.00197 |
Flat Shift 4 |
0 |
[-0.02,0.02] |
-0.0114+-0.00188 |
0.02126+-0.00177 |
Flat Shift 5 |
[-0.02,0.02] |
[-0.02,0.02] |
0.00949+-0.0022 |
0.0259+-0.001596 |
Flat Shift 6 |
[-0.02,0.02] |
[-0.02,0.02] |
-0.01044+-0.0031 |
0.03217+-0.00381 |