Hi Andrea,
I will ask our expert once he’s back from vacation, but in the meanwhile, searching for ‘TGenPhaseSpace’ in this forum might give some help (even if some are still unanswered…)
See for example this post (just trying to guess…)
But note that I don’t know what TGenPhaseSpace::GetWtMax() is supposed to return (i.e. what ‘max weight’ is)
And beside the fact that the returned weight is higher that the max weight, does your distribution look correct?
Cheers, Bertrand.