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[FIXED] Problem with PndVertexFitter for particles with neutral charge [message #18279]

Fri, 29 May 2015 10:44

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

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

Attachment: 4CFit_chi2.png
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Attachment: VertexFit_chi2.png
(Size: 27.52KB, Downloaded 1081 times)
Attachment: 4CFit_prob.png
(Size: 21.30KB, Downloaded 1076 times)

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

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[Message index]

		[FIXED] Problem with PndVertexFitter for particles with neutral charge By: Jennifer Pütz on Fri, 29 May 2015 10:44
		Re: Problem with PndVertexFitter for particles with neutral charge By: StefanoSpataro on Fri, 29 May 2015 11:20
		Re: Problem with PndVertexFitter for particles with neutral charge By: Jennifer Pütz on Fri, 29 May 2015 11:24
		Re: Problem with PndVertexFitter for particles with neutral charge By: StefanoSpataro on Fri, 29 May 2015 11:26
		Re: Problem with PndVertexFitter for particles with neutral charge By: Jennifer Pütz on Fri, 29 May 2015 11:37
		Re: Problem with PndVertexFitter for particles with neutral charge By: StefanoSpataro on Fri, 29 May 2015 11:41
		Re: Problem with PndVertexFitter for particles with neutral charge By: Jennifer Pütz on Fri, 29 May 2015 11:47
		Re: Problem with PndVertexFitter for particles with neutral charge By: StefanoSpataro on Fri, 29 May 2015 11:57
		Re: Problem with PndVertexFitter for particles with neutral charge By: André Zambanini on Fri, 29 May 2015 12:56
		Re: Problem with PndVertexFitter for particles with neutral charge By: Ralf Kliemt on Fri, 29 May 2015 14:27

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