Some few events with high event weights
Hello,
I am currently generating som e+e- > ta+ ta- events at the Z mass using MadGraph (v. 3.5.3). I am using Pythia (v. 8.306) and Delphes (v.3.5.0) chained after the generation for showering/
I am now analyzing these events (the Delphes root tree). Because I had some non-physical things in my distributions I also took a closer look at the event weights. There I noticed that most events have weight 1 and there are some (about 500 out of 1 000 000) that have the process cross section as weight. I would have expected that all event weights are around the cross section or all around one but not this mixture. Overall there are the expected 1 000 000 events I wanted to generate.
Could someone explain to me where this comes from and how to potentially fix this or how to handle this correctly?
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