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Re: Small positive chi2 values in PndKinFitter [message #14816 is a reply to message #14684] Mon, 27 May 2013 13:14 Go to previous message
Lu Cao is currently offline  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?

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  • Attachment: Ds_mcf.png
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