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Re: Question on GeaneTrackRep. [message #8017 is a reply to message #8016] Tue, 10 March 2009 10:26 Go to previous messageGo to previous message
Sebastian Neubert is currently offline  Sebastian Neubert
Messages: 282
Registered: March 2006
Location: Munich
first-grade participant

From: *natpool.mwn.de
Dear colleagues,

I thought about this issue for some time at several occasions in the past and I always came to the conclusion, that there is no failsafe way to handle this ambiguity. From the measured hits alone one cannot tell in which direction the particle was going. The most general way is to fit both hypotheses.

One could make some tentative assumptions based on the general topology (most tracks come from the IP) but this is not general.

In my view it is a question that cannot be solved in the fitter! The direction of the track has to be decided upon during pattern recognition.

The hits have to be sorted along the track before the fitting! This has always been pointed out. It is also part of the pattern recognition (and not the easiest one).

Cheers!
Sebastian.


Sebastian Neubert
Technische Universität München
Department Physik E18
sneubert@e18.physik.tu-muenchen.de
tel: +49-8928912592
 
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