| Problem with PndKinVtxFitter and Ks decays [message #14243] |
Wed, 28 November 2012 13:01  |
2dd180b0
Messages: 2
Registered: September 2011
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occasional visitor |
From: *ikp.kfa-juelich.de
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Dear all,
I've come across a problem while trying to reconstruct the following decay:
D0 -> Ks pi+ pi-, Ks -> pi+ pi-
The procedure I use is to first use PndKinVtxFitter to fit the pi+ pi- from the Ks decay to a common vertex, and then use PndKinVtxFitter to combine the fitted Ks with another pi+ pi- pair, to reconstruct the D0. The problem is that the fit to the D0 -> Ks pi+ pi- always returns nan for the chi^2.
The fitting code I use is exactly analogous to that used by Marius to reconstruct psi(3770) -> D+ D-, D+- -> K+- pi+ pi-, and we think that the problem is due to PndKinVtxFitter not being able to properly handle the neutral Ks candidate.
I've attached the analysis code and EvtGen decay file that I used for this analysis.
Best,
Sean
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