GSI Forum: Bugs, Fixes, Releases » [FIXED] Problem with PndVertexFitter for particles with neutral charge

Home » PANDA » PandaRoot » Bugs, Fixes, Releases » [FIXED] Problem with PndVertexFitter for particles with neutral charge

Show: Today's Messages :: Polls :: Message Navigator

[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
(Size: 24.20KB, Downloaded 1238 times)
Attachment: VertexFit_chi2.png
(Size: 27.52KB, Downloaded 1271 times)
Attachment: 4CFit_prob.png
(Size: 21.30KB, Downloaded 1280 times)

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

Report message to a moderator

[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

Previous Topic:	[FIXED] Ideal Tracking Bugs(?) when using FairLinks
Next Topic:	[NOTABUG] Warning: FairRun Function

Goto Forum:

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Sun May 24 03:12:35 CEST 2026

Total time taken to generate the page: 0.00755 seconds