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Re: GENFIT for transverse momenta < 200 GeV/c strange?! [message #11198 is a reply to message #11197] Thu, 18 November 2010 14:51 Go to previous messageGo to previous message
StefanoSpataro is currently offline  StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino
first-grade participant

From: 134.158.79*
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



But then I cannot understand why the helix fit seems better...
 
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