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The image MuonWithCUshows the distribution of energy deposited in the calorimeter when a muon goes through it. This is a typical image; not a rare event. Note that the track is "brocken"; every other layer there is a "hole" in the track, the energy deposited in that layer seems to show up off the track. The FRED Images 1,2,3 and 4 show the first 4 consecutive events from that run (after the application of the selection criteria described above). You can see the same behaviour in all them. The FRED image Evt0_4Views shows the event 0 from 4 different perspectives. Note that the Z-X perspective is different from the Z-Y perspective. In the first one Z-X view the layers 12, 34, .56, 7 8 are alined and the layers 21, 43, 65, 8 7 are off; whereas in the other Z-Y view the opposite occurs.
Anders and Leon atributed this effect to a wrong crystal diode relative calibration; since the position of the event along the crystal is determined comparing the signal produced in each of the diodes at the end of the crystal. This wrong relative-calibration seems to occur in all the layersThus a wrong relative calibration of these two diodes will shift the position determined for that energy deposition. The fact that the position determined for all layers are wrong (in a composed Z-Y and Z-X image) seems to point to a wrong relative calibration of all diode-pairs from each crystal.
This effect deteriorates the reconstruction of the direction of the event in the calorimeter; which is clearly observed in the distributions of the variables Trk1ZDir and CalZDir shown in MuonPisaReconstruction.gif, MuonPisaReconstruction.ps and MuonPisaReconstruction.root(gif, ps and root files). Note that (for this data and selection applied) the muon direction in the calorimeter (CalZDir) is properly reconstructed for ONLY a TINY FRACTION (about 3%) of the events.
Additional muon runs
From the list of muon runs in the Beam test data base, only 2 runs are shown as "Vertical Runs". I took
Electrons @ 5 GeV
David please include run numbers
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