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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: 47Registered: 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).

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

 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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