GSI Forum: Tracking » Start and stop values from PndRecoKalmanTask

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Re: Start and stop values from PndRecoKalmanTask [message #15198 is a reply to message #15197]

Tue, 13 August 2013 16:31

StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino

first-grade participant

From: 2.235.190*

In reality we have seen some strange thing like this together with Lia, where fome some tracks the difference between the first and the final momentun is very large or also negative.
We believe there is something weird in genfit, but up to now we were not able to udnerstand what is going wrong.

However, you could try to do add the following line in the kalman part:

kalmanttask->SetPropagateToIP(kFALSE);

In this way it neglects the backpropagation from the first hit to the interaction point, which is dangerous in the case the particles are emitted "far" from the IP.
Just to take out this possible noise source.

Question: have you selected ony the fitted tracks? The non fitted tracks (flag<=0) should be bad.

The other point could be that inside the trackcand the hits are not well sorted. I admit I never checked the ideal mvdsttgem trackcand, but this is easy to check.

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[Message index]

		Start and stop values from PndRecoKalmanTask By: Simone Esch on Tue, 13 August 2013 16:00
		Re: Start and stop values from PndRecoKalmanTask By: StefanoSpataro on Tue, 13 August 2013 16:31
		Re: Start and stop values from PndRecoKalmanTask By: Simone Esch on Tue, 13 August 2013 16:53
		Re: Start and stop values from PndRecoKalmanTask By: Simone Esch on Thu, 15 August 2013 09:13
		Re: Start and stop values from PndRecoKalmanTask By: StefanoSpataro on Thu, 15 August 2013 11:03

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