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Re: Initial 4 vector in EvtGen(Direct) [message #16982 is a reply to message #16981] Thu, 10 July 2014 21:06 Go to previous messageGo to previous message
StefanoSpataro is currently offline  StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino
first-grade participant

From: *ip71.fastwebnet.it
You should use pbarpsystem as initial state, and let it decay into J/psi pi+ pi-
w/o any intermediate X resonance in evtgen.
If you use an initial resonance, then your initial mass has a smearing due to the particle width (108MeV in your case), then it will change with the random seed.
I hope i have clarified the situation.
 
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