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Re: Problem with Xi(1820) in EvtGen [message #18625 is a reply to message #18558]

Mon, 02 November 2015 09:52

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

continuous participant

From: *ikp.kfa-juelich.de

Hi Stefano,

I tried out what happens, if I use the mass of 5.5 without the suggested patch. Going to higher pbarpsystem masses seems to fix the problem (see plot below).

index.php?t=getfile&id=8562&private=0

This is similiar to the observations of the EvtGen guys.
If I understood them correct, the code of src/EvtGenBase/EvtMassAmp.cpp::amplitude() checks first, if the pbarpSystem mass is bigger than the sum of the mass of the daughters. In my case the masses of Xi(1820)- and Xi+ are 1.823 + 1.322 = 3.145 which is much higher than the mass of the pbarpSystem. This seems to cause - together with L!=0 - that the mass distribution is flat.

Best,

Jenny

Attachment: XiMinus1820_Spin_3half_higher_pbarpSys_mass.png
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[Message index]

		Problem with Xi(1820) in EvtGen By: Jennifer Pütz on Wed, 14 October 2015 13:49
		Re: Problem with Xi(1820) in EvtGen By: StefanoSpataro on Wed, 14 October 2015 15:30
		Re: Problem with Xi(1820) in EvtGen By: Jennifer Pütz on Wed, 14 October 2015 15:35
		Re: Problem with Xi(1820) in EvtGen By: StefanoSpataro on Wed, 14 October 2015 17:25
		Re: Problem with Xi(1820) in EvtGen By: Jennifer Pütz on Thu, 15 October 2015 09:26
		Re: Problem with Xi(1820) in EvtGen By: StefanoSpataro on Thu, 15 October 2015 14:10
		Re: Problem with Xi(1820) in EvtGen By: Jennifer Pütz on Thu, 15 October 2015 14:18
		Re: Problem with Xi(1820) in EvtGen By: StefanoSpataro on Sun, 01 November 2015 13:50
		Re: Problem with Xi(1820) in EvtGen By: Elisabetta Prencipe (2) on Sun, 01 November 2015 17:03
		Re: Problem with Xi(1820) in EvtGen By: StefanoSpataro on Sun, 01 November 2015 17:11
		Re: Problem with Xi(1820) in EvtGen By: Jennifer Pütz on Mon, 02 November 2015 09:52
		Re: Problem with Xi(1820) in EvtGen By: StefanoSpataro on Mon, 02 November 2015 10:49
		Re: Problem with Xi(1820) in EvtGen By: Jennifer Pütz on Mon, 02 November 2015 10:50

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