| Geant3 tracking cuts for the EMC [message #9562] |
Fri, 16 October 2009 13:58  |
Christian Hammann
Messages: 24
Registered: July 2009
Location: Bonn
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continuous participant |
From: *cb.uni-bonn.de
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Hi
I have noticed that the tracking thresholds for Geant3 are set to 1MeV by default, wich is probably to high. Also they are set globally, so it seems to me they are not tuned in any reasonable way for the EMC.
These cuts are set in gconfig/SetCuts.C. If I decrease the cut values to 100keV I get significant changes in the distribution of the energy in the cluster. For a 657 MeV photon the energy in the central crytal decreases from 542MeV for the 1MeV cut to 512MeV with the 100keV cut. The number of crystals in the cluster also increases from 13.9 to 16.8.
Of course the filesize and computing time increase with the lower cuts (about a factor 2 or so).
Are there some tuned cuts available? Do I have to load an additional file to set proper cut values?
Best regards
Christian
Christian Hammann
Universität Bonn
Helmholz-Institut für Strahlen und Kernphysik
Nußallee 14-16
53115 Bonn
Tel: +49 228 733895
Fax: +49 228 732505
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