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Home » PANDA » PandaRoot » Bugs, Fixes, Releases » [FIXED] Problem with PndVertexFitter for particles with neutral charge
icon5.gif  [FIXED] Problem with PndVertexFitter for particles with neutral charge [message #18279] Fri, 29 May 2015 10:44 Go to previous message
Jennifer Pütz is currently offline  Jennifer Pütz
Messages: 47
Registered: April 2015
Location: FZ Juelich
continuous participant
From: *ikp.kfa-juelich.de
Hi everyone,

I have a problem with the PndKinVtxFitter. I simulated 1000 events for the reaction pbar p → Xi- Xi+ → lambda0 pi- anti-lambda pi+. The lambda0 decays into a proton and pi- and the anti-lambda0 decays into an anti-proton and a pi+.

If I combine the proton and the pi- to the lambda0 the vertex fitter is working fine. Same for the antilambda0. But when I combine lambda0 and pi- to Xi- the vertex fitter does not work.

To check, if I made a mistake, I went back to an easier reaction: pbar p → Lambda0 AntiLambda0 → proton pi- anti-proton pi+
The vertex fitter is working fine for combining proton and pi- to lambda0. But if I combine lambda0 and anti-lambda0 to the pbar p system, here again the vertex fitter does not work.

index.php?t=getfile&id=8414&private=0

I checked the 4-Mom-Constraint Fitter and it is working.

index.php?t=getfile&id=8413&private=0 index.php?t=getfile&id=8415&private=0

Is there already a solution for this problem?

I'm using on my system:

Fairsoft Version: March 15
FairRoot: Master
PandaRoot: Trunk Rev. 27718

Best
Jenny

[Updated on: Wed, 03 February 2016 23:38] by Moderator

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