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Negative lambda masses after VtxFit [message #21890]

Tue, 05 December 2017 11:02

Jennifer Pütz
Messages: 47
Registered: April 2015
Location: FZ Juelich

continuous participant

From: *ikp.kfa-juelich.de

Hi all,

I observed negative lambda masses after vertex fitting. Likewise, the mass distribution after the mass constraint fit is strange.
The mass distribution of the non-fitted lambda candidate seems to be fine. (See the attached plots!)
Is there anyone else observing this? I know that Albrecht has also unphysical masses for lambda.

I am using the standard simulation macros (for the task),
PandaRoot trunk rev. 30210
FairRoot v17.03
FairSoft mar17
The production was made on Kronos. I attached also the Dec-File.

I also tried a different trunk version (rev 30202), but the problem is still observable.

Best regards,
Jenny

Attachment: lambda0_mass.png
(Size: 19.39KB, Downloaded 350 times)
Attachment: lambda0_mass_Vtxfit.png
(Size: 15.77KB, Downloaded 357 times)
Attachment: lambda0_mass_Massfit.png
(Size: 15.54KB, Downloaded 376 times)
Attachment: all.dec
(Size: 0.50KB, Downloaded 333 times)

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[Message index]

		Negative lambda masses after VtxFit By: Jennifer Pütz on Tue, 05 December 2017 11:02
		Re: Negative lambda masses after VtxFit By: Jennifer Pütz on Tue, 09 January 2018 10:18

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