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Re: Problem with PndKinVtxFitter and Ks decays [message #14244 is a reply to message #14243]

Wed, 28 November 2012 13:14

Ralf Kliemt
Messages: 508
Registered: May 2007
Location: GSI, Darmstadt

first-grade participant

From: *pool.mediaWays.net

Hallo Dean,

It is a "known issue" that the vertex fitters don't handle neutral particles correctly. In the new year I'll invest some time to repair that behaviour.

Bear in mind that the vertex fitters primarily are made for charged tracks under the common vertex hypothesis. You can, however, fit on the vertex of your pions from the D0 and select for the chi2. The cleaned pion sample is used to combine with the K0 to the D0. You can then apply the 4C fit (knowing the initial system) on both D0 and aD0 for further improvement.

Cheers
Ralf Kliemt

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[Message index]

		Problem with PndKinVtxFitter and Ks decays By: 2dd180b0 on Wed, 28 November 2012 13:01
		Re: Problem with PndKinVtxFitter and Ks decays By: Ralf Kliemt on Wed, 28 November 2012 13:14
		Re: Problem with PndKinVtxFitter and Ks decays By: Albrecht Gillitzer on Wed, 28 November 2012 14:09
		Re: Problem with PndKinVtxFitter and Ks decays By: Ralf Kliemt on Wed, 28 November 2012 15:18
		Re: Problem with PndKinVtxFitter and Ks decays By: 2dd180b0 on Wed, 28 November 2012 14:13

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