The madgraph check routines does not spot any issue on the events file. By looking at the first event by eye, the energy-momentum conservation are spot on. The mass of the particles are slightly off but I do not think that pythia complains about that (and this is actually very reasonable discrepancy).
So I would think that the issue is internal to pythia, but I would pass this bug report to someone (chiara) more expert than me on the use of pythia for indirect detection. She might know more.
Hi,
The madgraph check routines does not spot any issue on the events file. By looking at the first event by eye, the energy-momentum conservation are spot on. The mass of the particles are slightly off but I do not think that pythia complains about that (and this is actually very reasonable discrepancy).
So I would think that the issue is internal to pythia, but I would pass this bug report to someone (chiara) more expert than me on the use of pythia for indirect detection. She might know more.
Cheers,
Olivier