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description: GSI Helmholtzzentrum für Schwerionenforschung
items: Unexpected particles in Event Display window.
items: Re: Unexpected particles in Event Display window.

Unexpected particles in Event Display window.
type: item
description: Dear All, I have simulated two decay reactions using EvtGenDirect at just production threshold. These are the reactions. pbar p -> J/psi pi+ pi- -> e+ e- pi+ pi- (beam momentum = 5.049089 GeV/c and just above at 6.0 GeV/c). pbar p -> D*+ D*- -> D0 pi+ D0bar pi- -> K- pi+ pi+ k+ pi- pi- (beam momentum = 7.618268 GeV/c and just above at 8.0 GeV/c). After that, I had a look on particle tracks in the eventDisplay window and observed that some unexpected particles like Deutron, Alpha, Triton, neutron, antineutron, muons, gammas are present there which I did not expected from EvtGenDirect by defining a decay file for particular decay. To cross check for these additional particles, I created output.evt files using the same decay files then inside the output.evt file everything looks OK as I expected. Is this behavior of EvtGenDirect is normal? Will these additional particles harm the reconstruction of these decays? Kindly help me in this regard. I have attached simulation macros, decay files and snap shot of eventDisplay window.
creator: Ajay Kumar
date: 2015-09-13T11:07:43-00:00

Re: Unexpected particles in Event Display window.
type: item
description: Dear Ajay, those are secondary particles created by the interaction of primaries with materials. Everything under control.
creator: StefanoSpataro
date: 2015-09-13T17:17:45-00:00

Re: Unexpected particles in Event Display window.
type: item
description: Dear Stefano, Thank you for your quick reply. With Regards Ajay
creator: Ajay Kumar
date: 2015-09-14T05:04:54-00:00