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andrey-popov / PEC-tuples

CMSSW package to save basic physics objects in a simple ROOT format
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Check storing for GEN-level event weights #65

Closed andrey-popov closed 8 years ago

andrey-popov commented 8 years ago

From test samples it seems I only store one weight in an event. Maybe, they do contain a single weight only, though. Need to check this to make sure. Also check if the nominal weight is always stored as the first one (or in whichever other predictable manner).

andrey-popov commented 8 years ago

Tried running over a dataset produced with aMC@NLO (/TTJets_TuneCUETP8M1_13TeV-amcatnloFXFX-pythia8/RunIISpring15MiniAODv2-74X_mcRun2_asymptotic_v2-v3/MINIAODSIM). Observed some negative event weights. But there is still only a single weight per event stored. Looks like a bug.