Incorrect HepMC event weights

[michael]

Hello,

I'm showering some LHE events with pythia8 and Delphes (v3.3.2) . For each event I'd like to access the event weight. However, when I clone the "Event" branch:

TClonesArray *branchEvent = treeReader->UseBranch("Event");

and get the event

//in event loop
HepMCEvent *event = (HepMCEvent*) branchEvent -> At(0);
double wgt = event->Weight;

The weight of the event is always 1. I'd like to access the proper weight for each event, so that when summed over all events it gives the cross-section, rather than the total number of events. Is there a way of doing this?

Best,
Michael

[Pavel Demin]

Could you please provide some input files and a list of commands to run that would allow me to reproduce this problem?