GSI Helmholtzzentrum für Schwerionenforschung
Unexpected particles in Event Display window.
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.
Re: Unexpected particles in Event Display window.
Dear Ajay, those are secondary particles created by the interaction of primaries with materials. Everything under control.
Dear Stefano, Thank you for your quick reply. With Regards Ajay