| Re: geometry check [message #4277 is a reply to message #4256] |
Mon, 21 May 2007 14:20   |
StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino
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first-grade participant |
From: *physik.uni-giessen.de
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Hello,
the Hit information comes from the center of the crystal, so it can be that there are holes in this distribution.
But if you check the theta/phi of the points, then you will see there are no holes (maybe only some deep).
In the following plots you can see these distributions, in red for the forward module, in blue for the backward one.
EmcPoint.GetTheta() distribution, before the shift:
EmcPoint.GetTheta() distribution, after the shift:
The overlap region is now present, that means if one particle will go there, it will produce a signal in both the crystals, and not in one (or mabye in no one) of them.
The loss in counts I think should be adjusted by the calibration procedure, but this has to be studied.
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Attachment: emc_new.gif
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