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Re: TrackCand dip treatment where Theta > 90° [message #8314 is a reply to message #8312] Tue, 28 April 2009 14:24 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
Hi Marius!

TrackCand is actually NOT supposed to carry the starting values of the fit. At least there is no guarantee that the values that are put there are meaningfull.

We still have to design a good interface to carry the fit starting values.

TrackCand acquired the field for dip angel, momentum and so on as a quick and dirty solution.

You are completely right though that there is a fundamental ambiguity in the definition of the dip angle, which arises from the (unknow) direction of motion of the particle. You cannot distinguish a particle that is going into forward direction towards the center of the system (a secondary) from a track that moves from the interaction point outwards but in backward direction.

This ambiguity is not solved at the moment.

Cheers! Sebastian.

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

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