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Re: PndKinVtxFitter [message #17164 is a reply to message #17160] Tue, 12 August 2014 13:22 Go to previous messageGo to previous message
Alexandr Zinchenko is currently offline  Alexandr Zinchenko
Messages: 22
Registered: May 2009
occasional visitor
From: *jinr.ru
Maybe I got the logic behind the vertex constrained fit wrong.

In my understanding, this PndKinVtxFitter assumes the decay particles coming from the same vertex
(without assumption on the vertex position itself). Therefore, it can be useful, e.g., to reject background
combinations when building J/psi from 2 charged tracks (if the fit quality is not good enough).

If so, considering also neutrals when building more composite objects would help the same way to reject
background combinations. At least (in my understanding),
such an approach was proposed (and realized) during the PANDA Physics Book preparation - see Sect. 4.2.2.3, subsection
on ppbar-> J/psi pi+ pi-, item 3.

So, it looks like Rho package was able to do such a fit at that time.

Am I wrong?
 
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