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Re: Changes in PndTpcRiemannTrackingTask [message #12349 is a reply to message #12348] Tue, 26 July 2011 14:07 Go to previous messageGo to previous message
Johannes Rauch is currently offline  Johannes Rauch
Messages: 41
Registered: September 2010
Location: TUM
continuous participant
From: *natpool.mwn.de
Quote:

Then you have a found track with a charge sign as input to the Kalman and AFTER the Kalman fit you can have that the charge has changed sign, right?


Yes.

Quote:

Since the Kalman changes the sign at runtime, could it happen that the charge associated to the last hit (last params I mean) has opposite sign with respect to the one of the first hit?


When smoothing is not turned on, the track has only one state, and therefore only one charge.

I don't know what happens with smoothing turned on.
But what I saw in my display ist that usually in the second iteration the Kalman flips the charge if necessary. So with 3 iteration the charge should be consistent for all hits.

cheers,

Johannes
 
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