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Re: No back propagation to IP for V_0 reconstruction [message #17632 is a reply to message #17611] Thu, 04 December 2014 12:10 Go to previous messageGo to previous message
Ralf Kliemt is currently offline  Ralf Kliemt
Messages: 500
Registered: May 2007
Location: GSI, Darmstadt
first-grade participant

From: *gsi.de
Hi Donghee,

I agree with Stefano: You need to do a vertex fit to get the proper momentum directions of the pions. What it does is to find the position along the tracks (helices) where the momentum is tangent. Where your momentum is defined before you give it to the fit does not matter that much. If you want to use the pions defined as they were right after the Kalman filter you may simply use

PndAnalysis::ResetCandidate(RhoCandidate*) or PndAnalysis::ResetDaughters(RhoCandidate*) .

e.g.:
(theAnalysis->ResetDaughters(kshort);)


Cheers
Ralf

 
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