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Re: GENFIT for transverse momenta < 200 GeV/c strange?! [message #11197 is a reply to message #11194] |
Thu, 18 November 2010 13:53   |
Jens Sören Lange
Messages: 193 Registered: June 2005
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first-grade participant |
From: *kek.jp
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Hi David,
first question: can you check, which SVD geometry are you using? with cables etc.? (so maybe it even becomes worse).
Then, as a possible explanation:
The TPC is split into 2 parts, left and right, by the target beam pipe. At pT<=100 MeV, tracks are so curved, that, if they are in one part of the TPC, they can also enter the other part, and produce there a 2nd, short track (for higher pT this is impossible). Can you maybe check that? (e.g. number of hits per fitted track should be small).
Soeren
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