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Re: Problem with PndKinVtxFitter and Ks decays [message #14245 is a reply to message #14244] Wed, 28 November 2012 14:09 Go to previous messageGo to previous message
Albrecht Gillitzer is currently offline  Albrecht Gillitzer
Messages: 49
Registered: March 2004
continuous participant
From: *ikp.kfa-juelich.de
Hello Ralf,

I have another problem with PndKinVtxFitter: After fitting the mu+ and mu- tracks from J/psi decay to a common vertex (and in case of more than one found combination taking the one with the best chi2) and applying a chi2 cut, the mu+mu- invariant mass distribution has a clearly larger width than obtained with the raw, unfitted tracks. I would expect the opposite since after fitting and chi2 cut the result should be closer to reality.
Is this also a "known issue"? And could you please also look into this problem?

cheers, Albrecht
 
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