GSI Forum: Analysis » Small positive chi2 values in PndKinFitter

Home » PANDA » PandaRoot » Analysis » Small positive chi2 values in PndKinFitter

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

Re: Small positive chi2 values in PndKinFitter [message #14816 is a reply to message #14684]

Mon, 27 May 2013 13:14

Lu Cao
Messages: 77
Registered: February 2013

continuous participant

From: 114.138.133*

Hi,

In the simulation of Ds- -> K+ K- pi-, I found the chi2 values are too small in the mass constraint fitting of Ds meson, as that in the Ds+ (eta,e+,nu_e) case I mentioned before. And it seems impossible to filter out the background completely with chi2 cutting to get a delta function shaped histo for the Ds mass.

If the problem related the fitter can not be solved at this moment, how can I improve the selection in the present situation?

index.php?t=getfile&id=7381&private=0

Attachment: Ds_mcf.png
(Size: 80.47KB, Downloaded 1112 times)

Report message to a moderator

[Message index]

		Small positive chi2 values in PndKinFitter By: Lu Cao on Tue, 30 April 2013 11:13
		Re: Small positive chi2 values in PndKinFitter By: StefanoSpataro on Tue, 30 April 2013 14:13
		Re: Small positive chi2 values in PndKinFitter By: Klaus Götzen on Tue, 30 April 2013 17:41
		Re: Small positive chi2 values in PndKinFitter By: StefanoSpataro on Tue, 30 April 2013 18:44
		Re: Small positive chi2 values in PndKinFitter By: Klaus Götzen on Tue, 30 April 2013 20:33
		Re: Small positive chi2 values in PndKinFitter By: Lu Cao on Mon, 27 May 2013 13:14

Previous Topic:	analysis of multiple files
Next Topic:	how to convert kinematic variables from lab frame to cm frame in root

Goto Forum:

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Sat May 30 19:19:52 CEST 2026

Total time taken to generate the page: 0.00850 seconds