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Re: Vertex fitters' problems [message #14892 is a reply to message #14888] Fri, 21 June 2013 18:43 Go to previous messageGo to previous message
L. Zotti is currently offline  L. Zotti
Messages: 6
Registered: December 2010
occasional visitor
From: *to.infn.it
Dear Ralf,
thanks for your helping.
Looking in your analysis macro, I found you just missed one "break" at line 273. Actually with this modification, I got some better results from the ChiVtx fitter.
Moreover, cleaning the sample looking at the FitStatus flag, I got the following resolution:

PndChiVtxFitter x:32um y:52um z:138
PndVtxPRG (full) x:61um y:60um z:103um
PndVtxPRG (fast) x:60um y:61um z:103um

Plots for PndChiVtxFitter:
index.php?t=getfile&id=7418&private=0
Plots for PndKinVtxFitter:
index.php?t=getfile&id=7421&private=0
Plots for PndVtxPoca
index.php?t=getfile&id=7422&private=0
Plots for PndVtxPRG
1)fast: index.php?t=getfile&id=7419&private=0
2)full: index.php?t=getfile&id=7420&private=0

Still to be understood why resolution are different in x and y for the PndChiVtxFitter.
Do you think this results are reliables?
The KinVtxFitter and the Poca one still give strange results.
For what concern the kinematics, actually the kaons and the pions from the d0-meson are well separated in angle, how you can see here:
index.php?t=getfile&id=7417&private=0
  • Attachment: opening_angle.png
    (Size: 7.96KB, Downloaded 172 times)
  • Attachment: ChiVtx.png
    (Size: 25.80KB, Downloaded 163 times)
  • Attachment: FastVtx.png
    (Size: 27.66KB, Downloaded 170 times)
  • Attachment: FullVtx.png
    (Size: 26.98KB, Downloaded 161 times)
  • Attachment: KinVtx.png
    (Size: 26.92KB, Downloaded 190 times)
  • Attachment: PocaVtx.png
    (Size: 27.32KB, Downloaded 169 times)
 
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