| Problems with new GEM Geometry [message #22477] |
Tue, 17 April 2018 11:22  |
Tobias Stockmanns
Messages: 489
Registered: May 2007
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first-grade participant |
From: *ikp.kfa-juelich.de
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Dear PandaRooters and GEM experts,
in the analysis of the reaction: pbar p -> Xi Xibar pi pibar -> 3 pi 3 pibar p pbar we see a significant drop in the reconstruction efficiency depending on the GEM geometry we use. With the old geometry (gem_3Stations_Tube.root) we get 18.3% (15.2% MCTruth matched) of reconstructable events with all final state particles in the event, while with the new geometry (gem_3Stations_realistic_v2.root) this value drops to 6.4% (4.3% MCTruth matched).
It is not clear if this is a real effect of the additional material introduced by the more realistic description of the GEMs or if there is still a bug in the geometry description which causes the drop of a factor 3.
It would be great if an expert on the GEMs could have a look.
Cheers,
Tobias
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