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Re: Start and stop values from PndRecoKalmanTask [message #15214 is a reply to message #15198] Thu, 15 August 2013 09:13 Go to previous messageGo to previous message
Simone Esch is currently offline  Simone Esch
Messages: 37
Registered: August 2010
Location: Forschungszentrum Jülich...
continuous participant
From: *ext.kfa-juelich.de
Hello Stefano,

I checked the flag of my tracks.
18% of the tracks have the flag -1, which means that the NDF is zero, or that the transformation of a GeneFitTrack into a PndTrack failed.
( https://subversion.gsi.de/trac/fairroot/browser/pandaroot/trunk/GenfitTo ols/adapters/PndGenfitAdapters.cxx , around line 111)
The rest of the tracks have flag 1.

When I have a look at the tracks with Flag -1 I would say that the biggest amount of them is with this late start vector, but there is also an amount with I would judge as ok.
If i filter them out, I have still a big amount of tracks with a strange start value. So this is not a criteria for this Sad.

What is the reason to get a fit with a NDF=0? What is in this case wrong with the fit? Should I filter them out?

Best Regards

Simone

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