Home » PANDA » PandaRoot » Tracking » GENFIT for transverse momenta < 200 GeV/c strange?!
| Re: GENFIT for transverse momenta < 200 GeV/c strange?! [message #11198 is a reply to message #11197] |
Thu, 18 November 2010 14:51   |
StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino
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first-grade participant |
From: 134.158.79*
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| Jens Soeren Lange wrote on Thu, 18 November 2010 13:53 |
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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But then I cannot understand why the helix fit seems better...
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